CN104213120B - A kind of high saliferous working condition pressure container anti-corrosive metal coating and preparation method thereof - Google Patents
A kind of high saliferous working condition pressure container anti-corrosive metal coating and preparation method thereof Download PDFInfo
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- CN104213120B CN104213120B CN201410513069.4A CN201410513069A CN104213120B CN 104213120 B CN104213120 B CN 104213120B CN 201410513069 A CN201410513069 A CN 201410513069A CN 104213120 B CN104213120 B CN 104213120B
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Abstract
The invention discloses a kind of high saliferous working condition pressure container anti-corrosive metal coating and preparation method thereof, the metal dust that corrosion-inhibiting coating uses includes: 64～the Ni of 66%, 10～the Cr of 12%, 0～the C of 0.1%, 0～the S of 0.01%, 0～the P of 0.01%；16～B and Si of the Fe of 18%, 2.0～3.5%.The positive effect of the present invention is: the coating material energy gratification of the present invention answers the solder reflow requirement to material self-fluxing nature, pressure vessel anti-corrosive metal coating is prepared by the novel process of thermal spraying+sensing solder reflow, both the corrosion requirement of high saliferous natural gas operating mode had been met, the bond strength between coating and matrix can be drastically increased again, reduce the porosity of coating, be a kind of to be not only resistant to high saliferous deep-etching operating mode, but also the economical new type corrosion resistant material that can promote the use of on pressure vessel.
Description
Technical field
The present invention relates to a kind of high saliferous corrosive conditions downforce container anti-corrosive metal coating and preparation side thereof
Method.
Background technology
Existing metal thermal spraying material on the structural member such as steel construction, impeller as anticorrosion, the gold of wear-resisting functions
Belong to coating and be widely used；But owing to its coating exists bigger porosity (typically more than 1%) and base
The shortcomings such as body metal bond strength low (typically at below 80MPa) and limit on pressure vessel promote should
With.Under the exceedingly odious corrosive conditions of high saliferous, middle thick-walled vessel uses corrosion resisting property preferable, expensive
Composite board material or pure material limited by manufacturing process and economy.Therefore, need find one can be both
Resistance to high saliferous deep-etching operating mode, the economical anti-corrosion coating can promoted the use of on pressure vessel again and preparation thereof
Method.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of high saliferous working condition pressure container metal
Corrosion-inhibiting coating and preparation method thereof, it is adaptable to media operation temperature be not less than 80 DEG C, C 1 content the least
In 20 × 104ppm、CO2Content contains under salt corrosion natural gas operating mode long not less than the height of 2% (volume fraction)
The pressure vessel metal coating layer material of phase work, uses oxy-acetylene flame spraying+supersonic spray coating+sensing simultaneously
The novel spraying technique of material remelting, can effectively overcome corrosion-inhibiting coating and matrix material bond strength in prior art
The drawback that the highest, porosity is big.
The technical solution adopted in the present invention is: a kind of high saliferous working condition pressure container anti-corrosive metal coating,
The metal dust used includes: 64～the Ni of 66%, 10～the Cr of 12%, 0～the C of 0.1%, 0～0.01%
S, 0～the P of 0.01%；16～B and Si of the Fe of 18%, 2.0～3.5%.
Present invention also offers a kind of high saliferous working condition pressure container anti-corrosive metal coating preparation method, including
Following steps:
Step one, selection metal dust and abrasive material；
Step 2, internal pressure vessel walls need to be protected position carry out surface derusting；
Step 3, internal with corrosive medium contact surface thermal jet metal dust at pressure vessel, formed corrosion-resistant
Layer；
Step 4, employing radio-frequency induction coil carry out cladding to anti-corrosion layer；
Step 5, surface quality detection.
Compared with prior art, the positive effect of the present invention is: the coating material energy gratification of the present invention answers pricker
The material remelting requirement to material self-fluxing nature, prepares pressure by the novel process of thermal spraying+sensing solder reflow
Canister metals corrosion-inhibiting coating, had both met the corrosion requirement of high saliferous natural gas operating mode, and can drastically increase again
Bond strength (up to 200 MPa) between coating and matrix, the porosity (less than 0.5%) of reduction coating,
Be a kind of be not only resistant to high saliferous deep-etching operating mode, but also can promote the use of on pressure vessel economical novel resistance to
Corrosion material.
Detailed description of the invention
A kind of high saliferous working condition pressure container anti-corrosive metal coating, the metal dust of employing is 60 ferronickels
R200 alloy powder (is called for short R200-60), including: 64～the Ni of 66%, 10～the Cr of 12%, 0～0.1%
C, 0～the S of 0.01%, 0～the P of 0.01%；16～B and Si of the Fe of 18%, 2.0～3.5%.Gold
Belonging to powder uses aerosolization method to produce, and being shaped as spherical or subsphaeroidal, granularity is 150～500 mesh, is suitable for
Flame-spraying.
Present invention also offers the preparation method of a kind of high saliferous working condition pressure container anti-corrosive metal coating, bag
Include following steps:
Step one: select metal dust and abrasive material
(1) metal dust is 60 ferronickel R200 alloy powders (being called for short R200-60), including: 64～66%
Ni, 10～the Cr of 12%, 0～the C of 0.1%, 0～the S of 0.01%, 0～the P of 0.01%；16～18%
B and Si of Fe, 2.0～3.5%.Metal dust uses aerosolization method to produce, and is shaped as spherical or near ball
Shape, granularity are 150～500 mesh, are suitable for flame-spraying.
(2) abrasive material: according to the relation between coating layer thickness and sand grains diameter, is selected by design coating layer thickness
Specification is 14 mesh or the Brown Alundum of 16 mesh, it is ensured that have good adhesion between coating and pressure vessel.
Step 2: internal pressure vessel walls need to be protected position and carry out surface derusting
Abrasive material is loaded in abrasive blast equipment, sand-blasting gun is placed in pressure vessel by handle hole, start air
Compressor, manual operation or machine automatization operation sand-blasting gun make internal pressure vessel walls need to protect position to carry out surface
Rust cleaning, it is ensured that surface derusting grade is not less than Sa3.0 level.
Step 3: at pressure vessel inside and the metal powder described in corrosive medium contact surface thermal jet step one
End, forms anti-corrosion layer
Load in powder feed system after metal dust in an oven 110～115 DEG C of drying 8～12h, start
Air compressor, water-cooling system and flame spray device.Metal bottom is formed initially with oxy-acetylene flame spraying
Layer, adjusts the flow 72～78g/min of negative gravity powder feeder, it is ensured that spray distance 100～120mm,
Control oxygen pressure 0.85～0.95MPa, oxygen flow 12～18L/min, control acetylene pressure 0.11～
0.13MPa, acetylene flow 13～14L/min, formed neutral flame stream, by manual operation or machinery from
R200～the thawing of 60 metal dusts of 150～300 mesh are injected into performance parameter and conform to by dynamic operation spray gun
The metal back layer asked；Then use supersonic spray coating to be formed metal faced, adjust nitrogen powder feeder pressure
0.55～0.65MPa, nitrogen flow 0.25～0.35L/min, it is ensured that spray distance 100～120mm,
Control oxygen pressure 0.85～0.95MPa, oxygen flow 26～30L/min, control propane pressure 0.65～
0.75MPa, propane flow 16～20L/min, form neutral flame stream；Control flame blows air pressure
0.55～0.65MPa, air mass flow 65～75L/min, operates spray by manual operation or machine automatization
It is coated with rifle and R200～the thawing of 60 metal dusts of 300～500 mesh are injected into the satisfactory metal of performance parameter
Surface layer.
Metal coating thickness is detected with calibrator, it is ensured that corrosion-resistant finishes thickness meets design in spraying process
Require (general 0.3 arrives 0.5mm)；If thickness is more than or equal to more than design thickness 0.15mm, use
Unnecessary coating is ground off by abrasive machine.
Step 4: use radio-frequency induction coil remelting, improves the bond strength of coating, reduces porosity
Induction coil tracking control system is put into container, it is ensured that induction coil can be along internal pressure vessel walls
Move in a circle (50～120mm/min), can in axial direction move again (moving range 0～1.5m),
Can also radially adjust (away from coating surface 1～3mm).Start frock control system, start water-cooled
System, high-frequency induction equipment (frequency 100～300KHz, power 30～50Kw are set) so that coating begins
Reach inducting remolten temperature (900～950 DEG C), heat affecting thickness eventually less than or equal to 3mm, it is ensured that metal is coated with
Without the defect such as non-penetration or superfusion in Ceng.Per pass cladding is complete, adjusts frock and makes sensing rifle move the about line of induction
The 2/3 of circle width, it is ensured that overlap without half-cooked between coating per pass.When length direction reaches the frock limit, by work
Mounting or dismounting are ressembled except moving forward the distance less than or equal to 2m, repeat step 4 until completing be there is a need to
The position of spraying.
Step 5: surface quality detection
Coating surface is carried out ultrasonic and coloration detection, it is ensured that the defects such as coating flawless, pore, slag inclusion.
Otherwise, answer this defect area of hand sand to matrix, use local route repair, until detection is qualified.
The operation principle of the present invention
The nickel of about 60%, it is ensured that alloy has the ability of good opposing stress corrosion；The chromium of about 11%,
Guarantee that alloy has good pitting corrosion；Boron, the silicone content of about 3% ensure metal coating and matrix material
Material has good wettability, and ensures that coating has suitable hardness, low porosity and even curface；
Carbon in alloy controls less than 0.01%, it is to avoid carbon boride and free carbon occur, does not make moulding of alloy
Property decline；S, P content are less than 0.01%, are avoided that harmful element affects coating antiseptic effect.Coordinate super
Velocity of sound flame-spraying+sensing solder reflow or the process of flame-spraying+sensing solder reflow, it is ensured that
R200～the corrosion requirement under high saliferous operating mode of the 60 pressure vessel metal coatings, ensure that again metal coating makes
It is firmly combined with matrix during with, phenomenon will not be fallen off.
Claims (8)
1. one kind high saliferous working condition pressure container anti-corrosive metal coating, it is characterised in that: the metal dust of employing is as follows: 64～the Ni of 66%, and 10～the Cr of 12%, 0～the C of 0.1%, 0～the S of 0.01%, 0～the P of 0.01%；16～B and Si of the Fe of 18%, 2.0～3.5%, total content is 100%.
One the most according to claim 1 high saliferous working condition pressure container anti-corrosive metal coating, it is characterised in that: described metal dust uses aerosolization method to produce, and being shaped as spherical or subsphaeroidal, granularity is 150～500 mesh.
3. one kind high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterised in that: comprise the steps:
Step one, selection metal dust and abrasive material；
Step 2, internal pressure vessel walls need to be protected position carry out surface derusting；
Step 3, internal with corrosive medium contact surface thermal jet metal dust at pressure vessel, form anti-corrosion layer:
Load in powder feed system after the metal dust described in claim 1 in an oven 110～115 ° of C drying 8～12 h, form metal back layer initially with oxy-acetylene flame spraying；Then supersonic spray coating is used to be formed metal faced, it is ensured that the metal coating thickness that metal back layer and surface layer are constituted is 0.3 to 0.5 mm；
Step 4, employing radio-frequency induction coil carry out cladding to corrosion-resistant finishes；
Step 5, surface quality detection.
One the most according to claim 3 high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterised in that: described abrasive material is 14 mesh or the Brown Alundum of 16 mesh.
One the most according to claim 3 high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterized in that: derusting method described in step 2 is: loaded by abrasive material in abrasive blast equipment, sand-blasting gun is placed in pressure vessel by handle hole, start air compressor, internal pressure vessel walls need to be protected position and carry out surface derusting by operation sand-blasting gun, it is ensured that surface derusting grade is not less than Sa3.0 level.
One the most according to claim 3 high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterized in that: the spraying coating process of described metal back layer is: adjust flow 72～78 g/min of negative gravity powder feeder, ensure spray distance 100～120 mm, control oxygen pressure 0.85～0.95 MPa, oxygen flow 12～18 L/ min, control acetylene pressure 0.11～0.13 MPa, acetylene flow 13～14 L/ min, form neutral flame stream, the metal dust thawing of 150～300 mesh is injected into the satisfactory metal back layer of performance parameter by operation spray gun.
One the most according to claim 3 high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterized in that: described metal faced spraying coating process is: adjust nitrogen powder feeder pressure 0.55～0.65MPa, nitrogen flow 0.25～0.35 L/min, ensure spray distance 100～120 mm, control oxygen pressure 0.85～0.95 MPa, oxygen flow 26～30 L/min, control propane pressure 0.65～0.75
MPa, propane flow 16～20 L/ min, form neutral flame stream；Controlling flame blows air pressure 0.55～0.65 MPa, air mass flow 65～75 L/ min, it is satisfactory metal faced that the metal dust thawing of 300～500 mesh is injected into performance parameter by operation spray gun.
One the most according to claim 3 high saliferous working condition pressure container anti-corrosive metal coating preparation method, it is characterized in that: the melting and coating process described in step 4 is: induction coil tracking control system is put into pressure vessel, guarantee that induction coil can move in a circle along internal pressure vessel walls, can move in direction both axially and radially again；Start frock control system, water-cooling system and high-frequency induction equipment so that coating consistently achieves the inducting remolten temperature of 900～950 ° of C and heat affecting thickness less than or equal to 3 mm, it is ensured that without non-penetration or superfusion defect in metal coating.
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| CN100347332C (en) * | 2004-08-11 | 2007-11-07 | 江门市威霖贸易有限公司 | Low hardness high-performance glass mold and cast-iron flame-spray welding nickel base alloy powder |
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Effective date of registration: 20180112 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: China Petroleum Engineering Construction Co Ltd Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: Engineering Design Co., Ltd., China Petroleum Group |
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Effective date of registration: 20210209 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |
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