CN118497660A - Anti-corrosion coating process method applied to surface of nuclear power reactor pressure vessel - Google Patents
Anti-corrosion coating process method applied to surface of nuclear power reactor pressure vessel Download PDFInfo
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- CN118497660A CN118497660A CN202410574612.5A CN202410574612A CN118497660A CN 118497660 A CN118497660 A CN 118497660A CN 202410574612 A CN202410574612 A CN 202410574612A CN 118497660 A CN118497660 A CN 118497660A
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- 238000000576 coating method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005260 corrosion Methods 0.000 title claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 54
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 23
- 239000000758 substrate Substances 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- 230000007797 corrosion Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000003350 kerosene Substances 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 239000012466 permeate Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002086 nanomaterial Substances 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 3
- 230000003116 impacting effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 15
- 238000010285 flame spraying Methods 0.000 abstract description 7
- 238000004381 surface treatment Methods 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 5
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000011148 porous material Substances 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000010963 304 stainless steel Substances 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000007847 structural defect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007749 high velocity oxygen fuel spraying Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C45/00—Amorphous alloys
- C22C45/02—Amorphous alloys with iron as the major constituent
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a process method of an anti-corrosion coating applied to the surface of a nuclear power reactor pressure vessel, and belongs to the field of surface treatment. The method comprises the following steps: 1) Surface pretreatment; 2) Selecting a spray gun; 3) Spraying with supersonic flame; 4) And (5) hole sealing treatment. According to the invention, the ultrasonic flame spraying iron-based amorphous alloy powder and the subsequent hole sealing treatment are adopted to obtain the anti-corrosion coating applied to the surface of the nuclear power reactor pressure vessel, and the heat transfer performance of the anti-corrosion coating is not affected. The invention has the advantages of wide raw material sources and simple process, can be used for surface corrosion prevention treatment of nuclear power, better protects the surface of the reactor pressure vessel, and prolongs the service life of the reactor pressure vessel.
Description
Technical Field
The invention belongs to the field of surface treatment, and particularly relates to a process method of an anti-corrosion coating applied to the surface of a nuclear power reactor pressure vessel.
Background
The reactor pressure vessel is used as one of the key safety barriers of the nuclear power station, and mainly has the functions of loading the internal components of the reactor, shielding the radiation of the reactor core, bearing dynamic and static loads and sealing a loop coolant. In order to ensure the heat transfer performance of the reactor pressure vessel, the surface of the reactor pressure vessel is not subjected to any surface treatment, which causes different corrosion problems on the surface during the installation and use processes, and the normal use of the reactor pressure vessel is affected.
The surface treatment technology is supersonic flame spraying, and the material is iron-based amorphous alloy. The supersonic oxygen flame spraying (High Velocity Oxygen Flame, HVOF) belongs to flame spraying, which uses kerosene and oxygen as fuel, the generated high temperature and high pressure flame flow is accelerated by a Laval nozzle, and the spray is sent into the spray gun at a certain angle, so that the spray powder can be sufficiently heated and accelerated. The spraying method has the advantages of high efficiency, good tensile and shearing resistance of the prepared coating, less failure of main components of the coating and the like, the amorphous powder is melted by utilizing a supersonic flame spray gun and accelerated by utilizing combustion air flow, so that the amorphous powder collides with the surface of a substrate in a high-temperature and high-speed state, the molten or semi-molten amorphous powder after colliding with the substrate is spread, and the spray gun reciprocates to finally form the coating with a certain thickness, thereby playing a certain protection role on the substrate.
Amorphous alloy refers to amorphous solid containing metal element as main component and retaining metal property. The amorphous alloy has uniform composition and structure and no crystal defects such as grain boundary, dislocation and the like, so that the amorphous alloy has excellent mechanical property and chemical property. Amorphous alloys have now formed tens of alloy systems, mainly including Pd, pt, au, mg, ca, zr, ti, hf, cu, fe, etc. Among the amorphous alloys, fe-based amorphous alloys have the characteristics of high strength, high hardness, and good wear resistance and corrosion resistance. The powdery Fe-based amorphous alloy coating can improve the wear resistance and fatigue fracture strength of the workpiece and has low cost.
At present, no research on the corrosion prevention technology of the reactor pressure vessel is carried out at home, and in order not to influence the heat transfer performance of the reactor pressure vessel, the surface of the reactor pressure vessel is not subjected to any surface treatment, so that different corrosion problems occur on the surface in the installation and use processes, and the normal use of the reactor pressure vessel is influenced. For the materials used for the reactor pressure vessel, related researches on the characteristics of corrosion resistance, influence on the thermal performance of a substrate, spalling resistance and the like of the amorphous alloy coated on the surface of the amorphous alloy are lacking.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a corrosion-resistant coating process method applied to the surface of a nuclear power reactor pressure vessel, which solves the problem of corrosion on the surface of the reactor pressure vessel under the condition of not affecting the heat transfer performance of the reactor pressure vessel.
The specific technical scheme adopted by the invention is as follows:
The invention provides a process method of an anti-corrosion coating applied to the surface of a nuclear power reactor pressure vessel, which comprises the following steps:
s1: pretreating the substrate by a surface to achieve cleaning and obtain roughness;
s2: the diameter, compression angle and expansion angle of the Laval nozzle are adjusted by taking the supersonic flame gun as a main body structure;
s3: preheating the surface of the pretreated substrate obtained in the step S1 by utilizing preheated iron-based amorphous alloy particles based on the supersonic flame gun adjusted in the step S2, and then spraying to form a coating on the surface of the substrate;
s4: and (3) after the temperature of the surface of the coating in the step (S3) is reduced to room temperature, uniformly coating a hole sealing agent on the surface of the coating, and standing to completely solidify the hole sealing agent.
Preferably, the substrate is a plate-shaped 16MND5 low alloy steel.
Preferably, in the step S1, the surface pretreatment method is as follows:
Firstly, pre-cleaning a base material to remove surface impurities; and then, using compressed air as power, and impacting quartz sand on the surface of the base material through a sand blasting process, so that the surface of the base material is clean and has roughness.
Preferably, the type of the supersonic flame gun is JP8000.
Preferably, the Laval nozzle has a diameter of 3.8mm, a compression angle of 46.5 ° to 56.5 °, and a widening angle of 4 °.
Preferably, the iron-based amorphous alloy particles comprise the following elements in percentage by mass: 0.30 to 0.35 percent of Cr and Ni, 0.037 to 0.046 percent of B and C, 0.04 to 0.12 percent of Mo and Al, 0.009 to 0.026 percent of Si and Mn, 0.0004 to 0.0009 percent of N and the balance of Fe.
Preferably, the preheating of the iron-based amorphous alloy particles means that the temperature thereof is raised from room temperature to 55 ℃ to 65 ℃.
In the step S3, the supersonic flame gun is started but no powder is fed, and the surface temperature of the base material is raised from room temperature to 55 ℃ to 65 ℃ to dry and preheat the water; after preheating, the spraying inlet flow of the supersonic flame gun is adjusted to be 0.0062kg/s kerosene and 0.0225kg/s oxygen, the incidence angle gamma is-45 degrees to-55 degrees, and powder is sent for spraying, so that a coating with the thickness of 0.3mm is formed on the surface of the base material.
Preferably, in the step S4, the hole sealing agent is an inorganic nano material PERMEATE HKN-2, and is cured for 6 hours at room temperature.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, the ultrasonic flame spraying iron-based amorphous alloy powder (particles) and the subsequent hole sealing treatment are adopted to obtain the anti-corrosion coating applied to the surface of the nuclear power reactor pressure vessel, and the heat transfer performance of the anti-corrosion coating is not affected. The invention has the advantages of wide raw material sources and simple process, can be used for surface corrosion prevention treatment of nuclear power, better protects the surface of the reactor pressure vessel, and prolongs the service life of the reactor pressure vessel.
Drawings
FIG. 1 is a schematic view of the Laval nozzle of the present invention; wherein α represents a compression angle, β represents an expansion angle, and d represents a nozzle diameter;
FIG. 2 is a schematic view of the incidence angle of particles according to the present invention; the included angle between the central line of the powder injection port and the central line in a vertical state is defined as an incidence angle gamma of particles when the powder injection port is inclined;
FIG. 3 is a schematic illustration of the surface of a coating prepared in accordance with the present invention;
FIG. 4 is a schematic representation of the thickness of a coating prepared in accordance with the present invention;
FIG. 5 is a schematic illustration of the coating prepared according to the present invention after salt spray corrosion with coatings obtained by other processes.
Detailed Description
The invention is further illustrated and described below with reference to the drawings and detailed description. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
The invention provides a corrosion-resistant coating process method applied to the surface of a nuclear power reactor pressure vessel, which comprises the following steps:
s1, surface pretreatment: the substrate is subjected to a surface pretreatment to achieve cleaning and to obtain roughness.
As a preferred embodiment of the present invention, the substrate is a plate-like 16MND5 low alloy steel.
In the step, the surface pretreatment method is to clean and then sand blast the surface of the base material to obtain certain cleanliness and roughness, and the method concretely comprises the following steps:
Firstly, pre-cleaning a base material to remove surface impurities; then, compressed air is used as power, and quartz sand is impacted on the surface of the base material at high speed through a sand blasting process, so that the quartz sand has impact and grinding effects, and the surface of the base material is further subjected to certain cleanliness and roughness, so that the adhesive force of amorphous powder on the base material can be enhanced.
S2, selecting a spray gun: the diameter, compression angle and expansion angle of the Laval nozzle are adjusted by taking the supersonic flame gun as a main body structure.
As a preferred embodiment of the present invention, the model of the supersonic flame gun is JP8000. The diameter of the Laval nozzle is 3.8mm, the compression angle is 46.5-56.5 degrees, and the expansion angle is4 degrees.
S3, supersonic flame spraying: and (2) preheating the surface of the pretreated substrate obtained in the step (S1) by utilizing preheated iron-based amorphous alloy particles based on the supersonic flame gun adjusted in the step (S2), and then spraying to form a coating on the surface of the substrate.
As a preferred embodiment of the present invention, the iron-based amorphous alloy particles comprise the following elements in mass percent: 0.30 to 0.35 percent of Cr and Ni, 0.037 to 0.046 percent of B and C, 0.04 to 0.12 percent of Mo and Al, 0.009 to 0.026 percent of Si and Mn, 0.0004 to 0.0009 percent of N and the balance of Fe.
In actual use, the method specifically comprises the following steps:
The iron-based amorphous alloy particles are selected for spraying, and the iron-based amorphous alloy particles are preheated during spraying, wherein the preheating temperature is about 60 ℃ (namely, the temperature is raised to 55 ℃ -65 ℃ from room temperature); meanwhile, the spray gun is opened, powder is not fed, and the surface of the base material is preheated (namely, the temperature is raised to 55-65 ℃ from room temperature) so as to prevent the influence of the moisture on the surface of the base material on the quality of the coating. After preheating, the inlet kerosene and oxygen mass flow were adjusted to appropriate values (preferably 0.0062kg/s kerosene and 0.0225kg/s oxygen were used). Powder is sent for spraying, and the incidence angle (preferably the incidence angle gamma is-45 DEG to-55 DEG) of the spray gun is controlled to obtain a coating with a certain thickness (preferably 0.3 mm).
S4, hole sealing treatment: and (3) after the temperature of the surface of the coating in the step (S3) is reduced to room temperature, uniformly coating a hole sealing agent on the surface of the coating, and standing to completely solidify the hole sealing agent.
In practical use, the presence of pores tends to cause the accumulation of corrosive solutions therein, taking into account the need to withstand high temperatures of 350 ℃ under normal operating conditions of the reactor pressure vessel, the need to resort to suitable pore-sealing agents (preferably inorganic nanomaterials PERMEATE HKN-2). When the temperature of the surface of the coating is reduced to room temperature, the pore sealing agent is uniformly coated on the surface of the coating by utilizing the hairbrush, but the oil, dust, water and other harmful attachments on the surface of the hairbrush are required to be removed to prevent the pore sealing agent from being impermeable, and the pore sealing agent is fully permeated and then is left to stand for curing for a certain time (preferably curing for 6 hours at room temperature).
The process according to the invention and the corresponding effects will be further illustrated by the examples below.
Examples
1) Plate-shaped 16MND5 low alloy steel with the initial size of 14cm by 1cm is subjected to pre-cleaning, surface impurities are removed, and then sand blasting is carried out. In the sand blasting process, compressed air is used as power, and quartz sand is impacted on the surface of the base material at a high speed to generate impact and grinding effects, so that the surface of the base material obtains certain cleanliness and roughness, and the adhesive force of amorphous powder on the base material can be enhanced.
2) Selection of a spray gun: a supersonic flame gun JP8000 is selected as a main structure, the compression angle of a Laval nozzle is 50 degrees, the diameter d of the Laval nozzle is 3.8mm, and the expansion angle beta of the Laval nozzle is 4 degrees, as shown in figure 1.
3) Supersonic flame spraying: the iron-based amorphous alloy particles with higher sphericity are selected for spraying, and the iron-based amorphous alloy particles are preheated during spraying, wherein the preheating temperature is about 60 ℃; meanwhile, the spray gun is opened, powder is not fed, the surface of the base material is preheated, the preheating temperature is about 60 ℃, and the influence of the moisture on the surface of the base material on the coating quality is prevented. After the preheating was completed, the inlet flow rate of kerosene was adjusted to 0.0062kg/s and oxygen was adjusted to 0.0225 kg/s. Powder is sent for spraying, and the incidence angle gamma of the spray gun is controlled to be about-50 degrees, as shown in figure 2, so as to obtain the coating thickness of 0.3 mm.
In this example, the elemental composition of the iron-based amorphous alloy particles is as follows (in mass percent):
0.30 to 0.35 percent of Cr and Ni, 0.037 to 0.046 percent of B and C, 0.04 to 0.12 percent of Mo and Al, 0.009 to 0.026 percent of Si and Mn, 0.0004 to 0.0009 percent of N and the balance of Fe.
4) Hole sealing treatment: the existence of pores easily causes the accumulation of corrosive solution, and inorganic nano hole sealing agent PERMEATE HKN-2 is adopted as the hole sealing agent in consideration of the high temperature of 350 ℃ required to be endured under the normal working condition of the reactor pressure vessel. When the temperature of the surface of the coating is reduced to room temperature, the pore sealing agent is uniformly coated on the surface of the coating by utilizing a brush. Before use, oil, dust, water and other harmful attachments on the surface of the hairbrush are removed so as to prevent the sealing agent from being impermeable. The pore sealing agent is fully permeated, and then is stood at room temperature for curing for 6 hours, the surface of the finally obtained coating is shown in figure 3, and the surface of the coating is smooth, the structure is compact and no obvious structural defect exists. The thickness of the coating after hole sealing is shown in fig. 4, and it can be seen from the graph that the coating thickness is uniformly distributed, the internal structure is complete, and no obvious structural defect exists.
In addition, salt spray tests are also performed on the untreated original substrate (plate-shaped 16MND5 low alloy steel), 304 stainless steel, the coating which is not subjected to hole sealing treatment and is obtained in step 3) of the embodiment, and the coating which is subjected to hole sealing treatment in step 4) as shown in fig. 5, and as a result, as can be seen from the graph, after the salt spray test at the same time, when the untreated original substrate (plate-shaped 16MND5 low alloy steel), 304 stainless steel and the coating which is not subjected to hole sealing treatment and is obtained in step 3) of the embodiment are corroded under different conditions, the coating which is subjected to hole sealing treatment in step 4) still maintains the complete surface morphology, and has strong corrosion resistance. The comparison shows that the coating obtained by the process method has the best corrosion resistance.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
Claims (9)
1. The technical method for the anti-corrosion coating applied to the surface of the nuclear power reactor pressure vessel is characterized by comprising the following steps:
s1: pretreating the substrate by a surface to achieve cleaning and obtain roughness;
s2: the diameter, compression angle and expansion angle of the Laval nozzle are adjusted by taking the supersonic flame gun as a main body structure;
s3: preheating the surface of the pretreated substrate obtained in the step S1 by utilizing preheated iron-based amorphous alloy particles based on the supersonic flame gun adjusted in the step S2, and then spraying to form a coating on the surface of the substrate;
s4: and (3) after the temperature of the surface of the coating in the step (S3) is reduced to room temperature, uniformly coating a hole sealing agent on the surface of the coating, and standing to completely solidify the hole sealing agent.
2. The method for preparing the corrosion-resistant coating on the surface of the nuclear power reactor pressure vessel according to claim 1, wherein the substrate is plate-shaped 16MND5 low alloy steel.
3. The method for preparing the corrosion-resistant coating on the surface of the nuclear power reactor pressure vessel according to claim 1, wherein in the step S1, the surface pretreatment method is as follows:
Firstly, pre-cleaning a base material to remove surface impurities; and then, using compressed air as power, and impacting quartz sand on the surface of the base material through a sand blasting process, so that the surface of the base material is clean and has roughness.
4. The method for preparing the anticorrosive coating on the surface of the nuclear power reactor pressure vessel according to claim 1, wherein the model of the supersonic flame gun is JP8000.
5. The method for preparing the anticorrosive coating applied to the surface of the nuclear power reactor pressure vessel according to claim 1, wherein the diameter of the Laval nozzle is 3.8mm, the compression angle is 46.5-56.5 degrees, and the expansion angle is 4 degrees.
6. The method for preparing the anticorrosive coating applied to the surface of the nuclear reactor pressure vessel according to claim 1, wherein the iron-based amorphous alloy particles comprise the following elements in percentage by mass: 0.30 to 0.35 percent of Cr and Ni, 0.037 to 0.046 percent of B and C, 0.04 to 0.12 percent of Mo and Al, 0.009 to 0.026 percent of Si and Mn, 0.0004 to 0.0009 percent of N and the balance of Fe.
7. The process for preparing the anticorrosive coating on the surface of the nuclear reactor pressure vessel according to claim 1, wherein the preheating of the iron-based amorphous alloy particles is to raise the temperature of the iron-based amorphous alloy particles from room temperature to 55-65 ℃.
8. The method for preparing the anticorrosive coating on the surface of the nuclear power reactor pressure vessel according to claim 1, wherein in the step S3, firstly, a supersonic flame gun is started but no powder is fed, and the surface temperature of the substrate is raised from room temperature to 55 ℃ to 65 ℃ to dry and preheat water; after preheating, the spraying inlet flow of the supersonic flame gun is adjusted to be 0.0062kg/s kerosene and 0.0225kg/s oxygen, the incidence angle gamma is-45 degrees to-55 degrees, and powder is sent for spraying, so that a coating with the thickness of 0.3mm is formed on the surface of the base material.
9. The method for preparing the anti-corrosion coating on the surface of the nuclear power reactor pressure vessel according to claim 1, wherein in the step S4, the hole sealing agent is inorganic nano material PERMEATE HKN-2 and is cured for 6 hours at room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410574612.5A CN118497660A (en) | 2024-05-10 | 2024-05-10 | Anti-corrosion coating process method applied to surface of nuclear power reactor pressure vessel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410574612.5A CN118497660A (en) | 2024-05-10 | 2024-05-10 | Anti-corrosion coating process method applied to surface of nuclear power reactor pressure vessel |
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| CN118497660A true CN118497660A (en) | 2024-08-16 |
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| CN202410574612.5A Pending CN118497660A (en) | 2024-05-10 | 2024-05-10 | Anti-corrosion coating process method applied to surface of nuclear power reactor pressure vessel |
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