CN114481133A - Method for removing (Ni, Pt) Al coating by chemical solution corrosion - Google Patents
Method for removing (Ni, Pt) Al coating by chemical solution corrosion Download PDFInfo
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- CN114481133A CN114481133A CN202011269891.2A CN202011269891A CN114481133A CN 114481133 A CN114481133 A CN 114481133A CN 202011269891 A CN202011269891 A CN 202011269891A CN 114481133 A CN114481133 A CN 114481133A
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- 238000000576 coating method Methods 0.000 title claims abstract description 147
- 239000011248 coating agent Substances 0.000 title claims abstract description 141
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 230000007797 corrosion Effects 0.000 title claims abstract description 29
- 239000000126 substance Substances 0.000 title claims abstract description 25
- 238000005488 sandblasting Methods 0.000 claims abstract description 26
- 229910001868 water Inorganic materials 0.000 claims abstract description 17
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 66
- 239000000243 solution Substances 0.000 claims description 28
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 7
- 238000005530 etching Methods 0.000 claims description 6
- 229910000601 superalloy Inorganic materials 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000010431 corundum Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 239000011253 protective coating Substances 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 230000003647 oxidation Effects 0.000 description 16
- 238000007254 oxidation reaction Methods 0.000 description 16
- 239000000758 substrate Substances 0.000 description 8
- 125000004122 cyclic group Chemical group 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000005269 aluminizing Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910000943 NiAl Inorganic materials 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013034 coating degradation Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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- 238000002791 soaking Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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- 238000012876 topography Methods 0.000 description 1
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- 238000004506 ultrasonic cleaning Methods 0.000 description 1
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- 235000019786 weight gain Nutrition 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Abstract
The invention relates to the field of surface treatment of high-temperature protective coatings, in particular to a method for removing a (Ni, Pt) Al coating by chemical solution corrosion. The method comprises the following process flows: carrying out sandblasting pretreatment on the (Ni, Pt) Al coating with the oxide film to remove the stable and compact oxide film generated on the surface; removing the coating by using a chemical solution corrosion method; and (4) carrying out post-treatment on the sample subjected to the coating removal, and removing corrosion products attached to the surface so as to prepare for coating a new coating again. The method is characterized in that: (1) the adopted removing solution is HCl and C6H8O7·H2O、CH3COOH、H2O; (2) during the removing, a water bath heating method is adopted, the temperature is 45-75 ℃, and the removing time is 30-60 min. The method has the advantages of high removing speed, thorough and clean removing of the coating and low cost, and the recoating coating meets the service requirement of the coating and can be used for realizing large-scale production.
Description
Technical Field
The invention relates to the field of surface treatment of high-temperature protective coatings, in particular to a method for removing a (Ni, Pt) Al coating by chemical solution corrosion.
Background
The (Ni, Pt) Al coating has excellent comprehensive performance of high-temperature oxidation resistance and hot corrosion resistance, and is a common commercial product of aircraft engines and naval gas turbinesOne of the industrialized coatings. The modification of Pt obviously improves the oxidation resistance of the coating, and the coating continuously generates alpha-Al by consuming Al2O3The oxidizing atmosphere is prevented from oxidizing and invading the base alloy, and the oxidation rate is retarded. But the coating is exposed in an oxidation environment for a long time, and along with mutual diffusion of elements and continuous consumption of Al element, the content of Al is reduced to lead beta-NiAl to be converted into gamma' -Ni3The phase change of Al transformation and plastic deformation of the coating occur, leading to oxide film spalling and coating degradation until eventual failure. The nickel-based single crystal superalloy substrate is expensive, and if the (Ni, Pt) Al coating is effectively removed and then coated, the (Ni, Pt) Al coating is effectively utilized, and the service life of the substrate alloy is maximized, which has important significance and economic value. If the unqualified or failed coating is removed and a new coating is coated on the premise of ensuring the original performance of the single crystal/oriented alloy blade substrate, the secondary utilization of the blade can be realized, the service life of the substrate is prolonged, and the blade of the engine is recycled, which has important significance for the overhaul and the service life extension of the engine. The technology of removing and recoating the coating is strictly blocked abroad, domestic research is mostly focused on the research on the coating removing process at present, the performance evaluation of the recoating coating is of little concern, and the removal research on the (Ni, Pt) Al coating lacks the surface matrix state after the removal, the performance investigation of the recoating coating and the like.
Disclosure of Invention
The invention aims to provide a method for removing a (Ni, Pt) Al coating by chemical solution corrosion, wherein a substrate after the coating is removed can be coated again, and the recoated coating meets the service requirement, so that the secondary utilization of workpieces such as blades and the like is realized.
The technical scheme of the invention is as follows:
a method for removing a (Ni, Pt) Al coating by chemical solution corrosion comprises the following specific steps:
(1) pretreatment: performing tangential small-pressure sand blasting treatment on the (Ni, Pt) Al coating workpiece with the used oxide film to remove the non-conductive oxide film on the surface of the coating; the sand blasting tangential pressure is 0.2-0.4 MPa, the sand blasting medium is 200-mesh glass shots, and the included angle between the sand blasting direction and the plane of the workpiece is 30-60 degrees;
(2) removing the coating by using a chemical corrosion method: the stripping solution used is H2O、HCl、CH3COOH、C6H8O7·H2Placing a workpiece in the mixed solution of O, heating in a water bath at 45-75 ℃, and removing for 30-60 min;
(3) and (3) post-treatment: sand blasting to remove corrosion products attached to the surface so as to prepare for coating a new (Ni, Pt) Al coating again; the sand blasting pressure is 0.2-0.4 MPa, and the sand blasting medium is 240-mesh corundum sand.
The method for removing the (Ni, Pt) Al coating by the chemical solution corrosion comprises the step (1) that the substrate alloy of the workpiece is nickel-based directionally solidified high-temperature alloy or nickel-based single crystal high-temperature alloy.
The method for removing the (Ni, Pt) Al coating by the chemical solution corrosion comprises the following steps of (1), wherein the normalized nominal composition range of the (Ni, Pt) Al coating is as follows according to atomic percent: 38-50 Al, 40-55 Ni, 2-10 Pt, 1-5 Cr, and 1-5 Co.
In the method for removing the (Ni, Pt) Al coating by chemical solution corrosion, in the step (1), the thickness of the (Ni, Pt) Al coating including the interdiffusion zone is 30-70 mu m.
The method for removing the (Ni, Pt) Al coating by the chemical solution corrosion comprises the step (1) that the thickness of an oxide film of the (Ni, Pt) Al coating after use is 1-5 mu m.
The method for removing the (Ni, Pt) Al coating by the chemical solution corrosion comprises the following steps of: HCl 25-30%, CH3COOH 5～10％，C6H8O7·H2O 15～20％，H2O 40～50％。
The design idea of the invention is as follows:
the invention provides a method capable of thoroughly removing a (Ni, Pt) Al coating without influencing the service performance of a recoating coating. The (Ni, Pt) Al coating reacts with the etching solution, which removes the coating mainly by etching along grain boundaries.
The invention has the advantages and beneficial effects that:
1. the method for removing the coating by using the chemical method has the advantages of high removing speed and simple and convenient operation.
2. The invention has good service performance of the recoating coating after removing the coating by using a chemical method.
3. The coating is thoroughly and cleanly removed, the cost is low, and the method can be used for realizing large-scale production.
Drawings
FIG. 1 is the cross-sectional profile of the coating after oxidative blasting.
FIG. 2 is a graph of the surface and cross-sectional profile of the coating at various removal times. The coating is characterized by comprising the following components of (a) a coating section morphology with the removing time of 15min, (b) a coating section morphology with the removing time of 30min, (c) a coating section morphology with the removing time of 45min, (d) a coating section morphology with the removing time of 100min, (e) a coating surface morphology with the removing time of 15min, (f) a coating surface morphology with the removing time of 30min, (g) a coating surface morphology with the removing time of 45min, and (h) a coating surface morphology with the removing time of 100 min.
FIG. 3 shows the surface (a, b) and cross-sectional (c, d) profiles of a single preparation coating (a, c) and a recoating coating (b, d).
FIG. 4 is a cross-sectional profile of a once-through coating (a) and a recoated coating (b) after cyclic oxidation at 1100 ℃ for 300 h.
FIG. 5 is a graph of 1100 ℃ cyclic oxidation kinetics for a once-through coating and a recoated coating. In the figure, the abscissa Number of cycles represents (Number of cycles), and the ordinate Δ w (Mass gain) represents the oxidation weight gain (mg/cm)2)。
Detailed Description
In the specific implementation process, the invention determines a method for removing a coating by chemical solution corrosion suitable for a (Ni, Pt) Al coating, and the process flow is as follows: pretreating the (Ni, Pt) Al coating with the oxide film to remove the oxidation products with stable surface; removing the coating by using a chemical solution corrosion method; and (4) carrying out post-treatment on the sample after the coating is removed, and removing corrosion products attached to the surface to prepare for coating a new coating again. The method is characterized in that: (1) the corrosion solution adopted for removing the coating has the composition H2O、HCl、C6H8O7·H2O、CH3COOH；(2)When the coating is removed, the water bath temperature is 45-75 ℃, and the removal time is 30-60 min.
The present invention will be described in further detail below with reference to examples and the accompanying drawings.
Example 1
In this embodiment, the coating is prepared on the substrate, and then the coating after service simulation is subjected to chemical solution corrosion removal.
First, a (Ni, Pt) Al coating was prepared on a second generation nickel based single crystal superalloy (N5):
(1) a nickel-based single crystal superalloy rod is cut into disc-shaped test pieces with the diameter of 15mm multiplied by 2mm by a linear cutting device, and a round hole with the diameter of about 1.7mm is cut at the edge of each test piece, so that a sample in a subsequent experiment can be hung.
(2) Firstly, grinding a sample by using No. 400 sand paper, then carrying out sand blasting treatment on 240-mesh white corundum, then boiling the sample in NaOH aqueous solution with the concentration of 50g/L for 10 minutes, and finally carrying out ultrasonic cleaning for 20 minutes by using mixed solution (the volume ratio is 1:1) of alcohol and acetone.
(3) And (3) sequentially carrying out Pt electroplating, vacuum interdiffusion and high-temperature low-activity vapor deposition aluminizing on the sample. Aluminizing for 5h to obtain a (Ni, Pt) Al coating (including a mutual diffusion region) with the thickness of 40-70 mu m; the nominal components are as follows according to atomic percentage: al 49.43, Cr 1.23, Co 1.93, Ni 43.16, Pt 4.25.
In order to simulate the service environment of the coating and accelerate the failure of the coating, a sample with the (Ni, Pt) Al coating is put into a muffle furnace at 1100 ℃ for oxidation for 300h, then the sample with the (Ni, Pt) Al coating is taken out, and the thickness of a stable and compact oxide film generated on the surface is 2 mu m.
Pretreating a sample after the simulation service: and performing tangential small-pressure sand blasting on the service sample to remove the compact and stable oxide film of the coating. The sand blasting tangential pressure is 0.3MPa, the sand blasting medium is glass sand, and the included angle between the sand blasting direction and the sample plane is 45 degrees. As shown in fig. 1, the cross-sectional profile of the coating after oxidation and sand blasting to remove the oxide film is shown in fig. 1, and the oxide scale is completely removed after sand blasting, and the residual thickness of the (Ni, Pt) Al coating is about 68 μm, i.e. the (Ni, Pt) Al coating to be removed is about 68 μm.
The composition of the removing solution is as follows by weight percent: HCl 25-30%, CH3COOH 5～10％，C6H8O7·H2O 15～20％，H2O 40～50％。
Cleaning a sample from which an oxide film is removed, namely removing the (Ni, Pt) Al coating in a removing solution, wherein the specific process is as follows:
firstly, C is added6H8O7·H2Dissolving O in deionized water, and adding HCl and CH3Stirring the COOH solution uniformly. Then the temperature in the reaction process is controlled to be 55 ℃ by using a constant-temperature water bath. As shown in fig. 2, the surface and cross-sectional topography of the sample at various times in the etching solution, it can be seen from the surface of fig. 2 that the dissolution is mainly by etching along the grain boundaries. As can be seen from the cross section of fig. 2, the coating is gradually dissolved with the increase of the soaking time, and after the sample is soaked in the corrosive solution for 15min, the outer layer of the coating is basically removed, and the interdiffusion zone is still remained; after 30min, the interdiffusion area of the coating has trace residue; after 45min, the coating was completely removed; when the time was extended to 100min, excessive corrosion of the substrate surface was observed, although the removal of the coating thickness was maximized. By combining the analysis, the coating can be completely removed after 45min of removal, the surface of the coating is relatively flat, but a needle-tip-shaped TCP phase can be seen in the monocrystal matrix, the removal condition of the coating is best, and the loss to the matrix is small.
The sample after removing the coating is subjected to sand blasting to remove corrosion products attached to the surface so as to prepare for coating a new coating again. The pressure of sand blasting is 0.3MPa, and the sand blasting medium is 240-mesh corundum sand.
Example 2
In this example, the sample from which the (Ni, Pt) Al coating was removed in example 1 was coated with a coating again.
Preparing a (Ni, Pt) Al coating on a second generation nickel base single crystal superalloy (N5), oxidizing the coating for 300h in a muffle furnace at 1100 ℃, removing the coating, and then recoating the (Ni, Pt) Al coating, wherein the specific operation method is the same as that of example 1, and the specific method is as follows:
(1) ultrasonically cleaning the sample subjected to sand blasting in a mixed solution (volume ratio is 1:1) of acetone and alcohol for 20min, and removing surface oil stains for later use;
(2) and (3) sequentially carrying out Pt electroplating, vacuum inter-diffusion and high-temperature low-activity vapor deposition aluminizing on the sample. The aluminizing time is 4 hours, and a (Ni, Pt) Al coating with the thickness of 40-45 mu m can be obtained for annealing treatment; after annealing, the nominal composition is as follows according to atom percentage: al 38.84, Cr 4.74, Co 4.70, Ni 41.76, Pt 9.96.
And (4) annealing the obtained (Ni, Pt) Al coating in a vacuum annealing furnace to eliminate holes in the coating. As shown in FIG. 3, the micro-morphologies of the primary coating and the recoating coating are almost the same as those of the primary coating and the recoating coating, and as can be seen from FIGS. 3(a) - (b), the micro-morphologies of the surfaces of the primary coating and the recoating coating are almost the same, and both are composed of "ridges" formed by grain boundaries and "furrows" formed in the grains. As can be seen from the cross-sectional shapes of FIGS. 3(c) - (d), both coatings are dense and continuous; the thickness of the coating of the recoating coating is slightly thicker than that of the coating prepared at one time, and a part of needle-point-shaped TCP phase exists in the matrix of the recoating coating sample, which is formed by the precipitation of refractory elements dissolved in a gamma phase through the interdiffusion of elements during the simulated oxidation in service in advance.
The recoated coating and the once-prepared coating obtained in this example were subjected to cyclic oxidation at 1100 ℃. As shown in fig. 4, the microscopic cross-sectional morphology photographs of the once-prepared coating and the recoated coating obtained in this example after 300h of 1100 ℃ cyclic oxidation. As can be seen from fig. 4(a) - (b), the oxide films of both coatings are dense and continuous, and the oxide film thickness of the recoated coating is slightly lower than that of the coating prepared at one time. The 1100 ℃ cyclic oxidation kinetics curves for the as-prepared and as-coated coatings obtained in this example are shown in fig. 5. As can be seen from FIG. 5, the oxidation kinetics of both coatings conform to the parabolic law, and it can be seen that the recoated coating still has good high-temperature oxidation resistance, meets the service requirements of the coating, and can be used for realizing large-scale production.
Claims (6)
1. A method for removing a (Ni, Pt) Al coating by chemical solution corrosion is characterized by comprising the following specific steps:
(1) pretreatment: performing tangential small-pressure sand blasting treatment on the (Ni, Pt) Al coating workpiece with the used oxide film to remove the non-conductive oxide film on the surface of the coating; the sand blasting tangential pressure is 0.2-0.4 MPa, the sand blasting medium is 200-mesh glass shots, and the included angle between the sand blasting direction and the plane of the workpiece is 30-60 degrees;
(2) removing the coating by using a chemical corrosion method: the stripping solution used is H2O、HCl、CH3COOH、C6H8O7·H2Placing a workpiece in the mixed solution of O, heating in a water bath at 45-75 ℃, and removing for 30-60 min;
(3) and (3) post-treatment: sand blasting to remove corrosion products attached to the surface so as to prepare for coating a new (Ni, Pt) Al coating again; the sand blasting pressure is 0.2-0.4 MPa, and the sand blasting medium is 240-mesh corundum sand.
2. The method for chemical solution corrosion removal of a (Ni, Pt) Al coating according to claim 1, wherein in step (1), the base alloy of the workpiece is a nickel-based directionally solidified superalloy or a nickel-based single crystal superalloy.
3. The method for chemical solution corrosion stripping of a (Ni, Pt) Al coating according to claim 1, wherein in step (1), the (Ni, Pt) Al coating has a normalized nominal composition, in atomic percent, in the range of: 38-50 Al, 40-55 Ni, 2-10 Pt, 1-5 Cr, and 1-5 Co.
4. The method for chemical solution etching removal of a (Ni, Pt) Al coating according to claim 1, wherein in step (1), the (Ni, Pt) Al coating includes an interdiffusion zone having a thickness of 30 to 70 μm.
5. The method for removing a (Ni, Pt) Al coating by chemical solution etching according to claim 1, wherein in the step (1), the thickness of the oxide film of the (Ni, Pt) Al coating after use is 1-5 μm.
6. A method for chemical solution corrosion stripping of (Ni, Pt) Al coatings according to claim 1 wherein the stripping solution is comprised of, in weight percent: HCl 25-30%, CH3COOH 5～10％，C6H8O7·H2O 15～20％，H2O 40～50％。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073989A (en) * | 1991-07-29 | 1993-07-07 | 西门子公司 | The refurbish of corrosive superalloy or high temperature steel part and the part of refurbish |
| US5851409A (en) * | 1996-12-24 | 1998-12-22 | General Electric Company | Method for removing an environmental coating |
| US6174380B1 (en) * | 1998-12-22 | 2001-01-16 | General Electric Company | Method of removing hot corrosion products from a diffusion aluminide coating |
| US6494960B1 (en) * | 1998-04-27 | 2002-12-17 | General Electric Company | Method for removing an aluminide coating from a substrate |
| CN103069548A (en) * | 2010-08-05 | 2013-04-24 | 昭和电工株式会社 | Composition for removal of nickel-platinum alloy metal |
-
2020
- 2020-11-13 CN CN202011269891.2A patent/CN114481133A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073989A (en) * | 1991-07-29 | 1993-07-07 | 西门子公司 | The refurbish of corrosive superalloy or high temperature steel part and the part of refurbish |
| US5851409A (en) * | 1996-12-24 | 1998-12-22 | General Electric Company | Method for removing an environmental coating |
| US6494960B1 (en) * | 1998-04-27 | 2002-12-17 | General Electric Company | Method for removing an aluminide coating from a substrate |
| US6174380B1 (en) * | 1998-12-22 | 2001-01-16 | General Electric Company | Method of removing hot corrosion products from a diffusion aluminide coating |
| CN103069548A (en) * | 2010-08-05 | 2013-04-24 | 昭和电工株式会社 | Composition for removal of nickel-platinum alloy metal |
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