CN115537824A - Solvent for removing coating, method for removing coating and application - Google Patents
Solvent for removing coating, method for removing coating and application Download PDFInfo
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- CN115537824A CN115537824A CN202211229701.3A CN202211229701A CN115537824A CN 115537824 A CN115537824 A CN 115537824A CN 202211229701 A CN202211229701 A CN 202211229701A CN 115537824 A CN115537824 A CN 115537824A
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- 239000011248 coating agent Substances 0.000 title claims abstract description 188
- 238000000576 coating method Methods 0.000 title claims abstract description 188
- 239000002904 solvent Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 61
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005488 sandblasting Methods 0.000 claims abstract description 50
- 230000007797 corrosion Effects 0.000 claims abstract description 40
- 238000005260 corrosion Methods 0.000 claims abstract description 40
- 238000005554 pickling Methods 0.000 claims abstract description 31
- 229910000365 copper sulfate Inorganic materials 0.000 claims abstract description 18
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000003112 inhibitor Substances 0.000 claims abstract description 15
- 238000004381 surface treatment Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 35
- 229920005989 resin Polymers 0.000 claims description 28
- 239000011347 resin Substances 0.000 claims description 28
- 238000005406 washing Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 18
- 239000002253 acid Substances 0.000 claims description 16
- 229910052759 nickel Inorganic materials 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 238000005422 blasting Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000007602 hot air drying Methods 0.000 claims description 9
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 9
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000011247 coating layer Substances 0.000 claims description 5
- 238000007733 ion plating Methods 0.000 claims description 5
- 238000001755 magnetron sputter deposition Methods 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 4
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 3
- 238000005566 electron beam evaporation Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 17
- 239000011253 protective coating Substances 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 238000005520 cutting process Methods 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 61
- 239000000956 alloy Substances 0.000 description 61
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 23
- 239000000758 substrate Substances 0.000 description 18
- 239000011734 sodium Substances 0.000 description 12
- 239000000853 adhesive Substances 0.000 description 9
- 230000001070 adhesive effect Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 229910000601 superalloy Inorganic materials 0.000 description 9
- 239000008367 deionised water Substances 0.000 description 7
- 229910021641 deionized water Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 5
- 238000003760 magnetic stirring Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001723 curing Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 3
- 235000019488 nut oil Nutrition 0.000 description 3
- 239000010466 nut oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000004506 ultrasonic cleaning Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- JMGZEFIQIZZSBH-UHFFFAOYSA-N Bioquercetin Natural products CC1OC(OCC(O)C2OC(OC3=C(Oc4cc(O)cc(O)c4C3=O)c5ccc(O)c(O)c5)C(O)C2O)C(O)C(O)C1O JMGZEFIQIZZSBH-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- IVTMALDHFAHOGL-UHFFFAOYSA-N eriodictyol 7-O-rutinoside Natural products OC1C(O)C(O)C(C)OC1OCC1C(O)C(O)C(O)C(OC=2C=C3C(C(C(O)=C(O3)C=3C=C(O)C(O)=CC=3)=O)=C(O)C=2)O1 IVTMALDHFAHOGL-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000011416 infrared curing Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- FDRQPMVGJOQVTL-UHFFFAOYSA-N quercetin rutinoside Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC=2C(C3=C(O)C=C(O)C=C3OC=2C=2C=C(O)C(O)=CC=2)=O)O1 FDRQPMVGJOQVTL-UHFFFAOYSA-N 0.000 description 2
- IKGXIBQEEMLURG-BKUODXTLSA-N rutin Chemical compound O[C@H]1[C@H](O)[C@@H](O)[C@H](C)O[C@@H]1OC[C@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](OC=2C(C3=C(O)C=C(O)C=C3OC=2C=2C=C(O)C(O)=CC=2)=O)O1 IKGXIBQEEMLURG-BKUODXTLSA-N 0.000 description 2
- ALABRVAAKCSLSC-UHFFFAOYSA-N rutin Natural products CC1OC(OCC2OC(O)C(O)C(O)C2O)C(O)C(O)C1OC3=C(Oc4cc(O)cc(O)c4C3=O)c5ccc(O)c(O)c5 ALABRVAAKCSLSC-UHFFFAOYSA-N 0.000 description 2
- 235000005493 rutin Nutrition 0.000 description 2
- 229960004555 rutoside Drugs 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005900 Flonicamid Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- RLQJEEJISHYWON-UHFFFAOYSA-N flonicamid Chemical group FC(F)(F)C1=CC=NC=C1C(=O)NCC#N RLQJEEJISHYWON-UHFFFAOYSA-N 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000007750 plasma spraying Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 239000002699 waste material Substances 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/20—Other heavy metals
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a solvent for removing a coating, a method for removing the coating and application, and relates to the technical field of surface treatment. The solvent comprises 30-50% of hydrochloric acid by volume fraction, 1-2 wt% of copper sulfate by mass fraction and 1-2 wt% of corrosion inhibitor by mass fraction. Hydrochloric acid is used as a main corrosion solvent, and copper sulfate can further improve the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness or occurrence of concave notches and the like. The corrosion inhibitor is added into the pickling solution to prevent the sample matrix from being corroded by hydrochloric acid, so that the dense high-temperature protective coating on the surface of the sample can be removed, and the influence of pickling on the surface tissue and the appearance of the matrix can be effectively relieved. In addition, in the method for removing the coating, the pickled sample is subjected to sand blasting treatment, and the residual coating is removed again under the mechanical force cutting action of sand blasting, so that the coating on the surface of the sample is removed more completely.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a solvent for removing a coating, a method for removing the coating and application.
Background
The nickel-based high-temperature alloy has better high-temperature resistance, acid corrosion resistance and stress corrosion resistance, and is widely applied to the fields of ocean, aviation, environmental protection, energy and petrochemical industry.
However, in the actual production process, due to unstable equipment operation or coating damage in the processing process, the MCrAlYX coating on the surface of the alloy substrate is easily uneven, so that the performance design standard of the high-temperature protective coating cannot be met, and the performance safety of the aero-engine is damaged. In view of the processing cost of the superalloy substrate, the surface of the substrate already having the coating needs to be repaired in order to minimize the waste of resources. The work of repairing the coating consists in removing the original coating and in returning as far as possible the surface of the alloy substrate to its original condition, making it suitable for being reapplied with a new coating. However, with the continuous improvement of science and technology, the density of the MCrAlYX coating is also improved, for example, the MCrAlYX coating prepared by adopting electric arc ion plating has a denser structure and smaller surface roughness than the coating prepared by adopting a plasma spraying technology. If the coating is directly corroded by the conventional chemical solution, the coating cannot be completely removed, and the substrate can be damaged and is irreparable. The physical removal method has strong limitation on the structure of the matrix, and a good removal effect can be achieved only on the structure with a regular shape. Therefore, how to completely remove the coating on the surface of the nickel-based superalloy substrate and ensure the integrity of the alloy substrate is one of the problems to be solved in the field.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a solvent for removing a coating, a method for removing the coating and application thereof, wherein the method can remove a compact high-temperature protective coating on the surface of a sample and can effectively relieve the influence of acid washing on the surface tissue and the appearance of a matrix.
The invention is realized by the following steps:
in a first aspect, the present invention provides a solvent for removing a coating, comprising 30 to 50 volume percent of hydrochloric acid, 1 to 2 mass percent of copper sulfate, and 1 to 2 mass percent of a corrosion inhibitor.
In an alternative embodiment, the corrosion inhibitor is flonicamid.
In a second aspect, the present invention provides a method of removing a coating, comprising subjecting a sample containing the coating to grit blasting after pickling in a coating removing solvent according to any one of the preceding embodiments.
In an alternative embodiment, the solvent temperature of the acid washing reaction is 50-60 ℃ and the reaction time is 10-15 min.
In an alternative embodiment, the grit blasting is a wet grit blasting, the wet grit blasted grit comprising any one of corundum or quartz sand.
Preferably, the grain size of the sand grains is 80-180 meshes, the sand blasting pressure is 0.35-0.5 MPa, the distance between the sample and the wet sand blasting port is 15-20 cm, and the sand blasting angle is 70-110 degrees.
Preferably, the step of cleaning the sample before the sand blasting is further included.
In an optional embodiment, after the sand blasting is finished, alkali washing is further performed on the test sample; preferably, the alkaline wash is an ultrasonic alkaline wash.
Preferably, the alkaline washing solution is a sodium bicarbonate solution, more preferably, the concentration of sodium bicarbonate in the sodium bicarbonate solution is 3 to 7wt%.
Preferably, the ultrasonic time is 3-7 min, and the ultrasonic frequency is 30-50 KHz.
In an alternative embodiment, the coating of the uncoated regions of the sample with resin is also included prior to pickling.
Preferably, the coating means comprises any one of uv lamp curing or infrared curing.
Preferably, the resin includes any one of an acrylic epoxy resin or an epoxy resin.
Preferably, the thickness of the resin coating is 3 to 5mm.
In an alternative embodiment, the method further comprises post-treating the sample after the alkaline washing, wherein the post-treating comprises removing the resin, washing and drying.
Preferably, removing the resin comprises soaking the sample in water at 85-95 ℃ for 5-10 min.
Preferably, the washing comprises washing with water.
Preferably, the drying comprises hot air drying after removing water by using compressed air; more preferably, the pressure of the compressed air is 0.25-0.3 MPa, the blowing time is 0.5-2 min, the temperature of the hot air drying is 110-130 ℃, and the drying time is 20-40 min.
In an alternative embodiment, the coating is a MCrAlYX coating, where M is at least one of Ni and Co and X is at least one of La, ru, re, Y, hf, zr, ce, pt and Dy.
In an alternative embodiment, the coating comprises deposition using at least one of magnetron sputtering, arc ion plating, or electron beam evaporation plating.
In an alternative embodiment, the coating is not subjected to vacuum heat treatment.
In a third aspect, the present invention provides a use of the solvent for removing a coating according to any one of the preceding embodiments or the method for removing a coating according to any one of the preceding embodiments in the field of surface treatment.
The invention has the following beneficial effects:
the invention provides a solvent for removing a coating, a method for removing the coating and application thereof, wherein hydrochloric acid in the solvent for removing the coating is a main corrosion solvent, and the addition of copper sulfate can further improve the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness, indentation, and the like, and meanwhile, a corrosion inhibitor is added into a pickling solution to prevent a sample matrix from being corroded by the hydrochloric acid, so that the dense high-temperature protection coating on the surface of the sample can be removed, and the influence of pickling on the surface structure and the appearance of the matrix can be effectively relieved. In addition, in the method for removing the coating, the pickled sample is subjected to sand blasting treatment, and the residual coating is removed again under the mechanical force cutting action of sand blasting, so that the coating on the surface of the sample is removed more completely.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a scanning electron microscope image of a cross section of an alloy after acid pickling in example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of a cross section of the alloy after sandblasting in example 1 of the present invention;
FIG. 3 is a scanning electron microscope image of a cross section of an alloy obtained in comparative example 1 of the present invention;
FIG. 4 is a scanning electron microscope image of a cross section of an alloy obtained in comparative example 2 of the present invention;
FIG. 5 is a cross-sectional metallographic view of an alloy according to comparative example 5 of the present invention;
FIG. 6 is a scanning electron microscope image of a cross section of an alloy of comparative example 6 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In a first aspect, the present invention provides a solvent for removing a coating, comprising 30 to 50 volume percent of hydrochloric acid, 1 to 2 mass percent of copper sulfate, and 1 to 2 mass percent of a corrosion inhibitor.
In the solvent for removing the coating, hydrochloric acid is used as a main corrosion solvent, and the addition of the copper sulfate solution can further improve the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness or occurrence of notches and the like, and meanwhile, the corrosion inhibitor is added into the pickling solution to prevent a sample substrate from being corroded by the hydrochloric acid, so that the solvent can remove a compact high-temperature protective coating on the surface of the sample, and can effectively relieve the influence of pickling on the surface structure and the appearance of the substrate.
In an optional embodiment, the volume fraction of hydrochloric acid in the solvent for removing the coating is 30-50%, the mass fraction of copper sulfate is 1-2 wt%, the mass fraction of the corrosion inhibitor is 1-2 wt%, and the balance is water; preferably, the corrosion inhibitor is fluthrin; preferably, the water is deionized water. The pickling solution prepared by compounding the raw materials in proportion has a good coating corrosion effect, and can avoid the influence of a solvent on the surface appearance of a substrate when the coating is removed.
Preferably, the solvent for removing the coating is prepared by mixing hydrochloric acid, copper sulfate and a corrosion inhibitor by magnetic stirring.
In a second aspect, the present invention provides a method of removing a coating, comprising subjecting a sample containing the coating to grit blasting after pickling in a coating removing solvent according to any one of the preceding embodiments.
The sample containing the coating is placed in the solvent for removing the coating, hydrochloric acid is used as a main corrosion solvent, and copper sulfate is used for assisting in improving the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness or occurrence of concave gaps and the like, then the pickled sample is subjected to sand blasting treatment, and the residual coating is removed completely by utilizing the mechanical force cutting effect of the sand blasting. Meanwhile, the corrosion inhibitor is added into the pickling solution to prevent the sample matrix from being corroded by hydrochloric acid. The method can remove the compact high-temperature protective coating on the surface of the sample, can effectively relieve the influence of acid washing on the surface tissue and the appearance of the matrix, has simple operation flow, and can be applied to large-scale production.
Preferably, the pickling requires that the whole area of the sample containing the coating be immersed in the solvent to improve the removal effect of the coating.
In an alternative embodiment, the temperature of the solvent during the acid washing reaction is 50 to 60 ℃ and the reaction time is 10 to 15min. The prior pickling treatment temperature is generally normal temperature, the impurities on the surface of a matrix can be well removed by pickling at the normal temperature, but the coating attached to the surface of the matrix cannot be corroded, even if the concentration of acid is increased, the coating on the surface of a sample is difficult to completely remove, and the high-concentration acid is easy to damage the matrix of the sample. The inventor enables the pickling solution to etch the coating on the surface of the sample into a loose structure by improving the reaction temperature in the pickling process, and controls the reaction time, thereby further avoiding the damage of the substrate etched by the pickling solution.
In an alternative embodiment, the grit blasting is a wet grit blasting, the wet grit blasted grit comprising any one of corundum or quartz sand.
Preferably, the grain size of the sand grains is 80-180 meshes, the sand blasting pressure is 0.35-0.5 MPa, the distance between the sample and the wet sand blasting port is 15-20 cm, the sand blasting angle is 70-110 degrees, and the sand blasting time is 5-10 min.
Preferably, the method further comprises cleaning the sample before the sand blasting to remove acid solution remained in the acid washing process.
In an alternative embodiment, after the sand blasting is finished, alkali washing neutralization is further carried out on the sample so as to adjust the pH value of the surface of the sample; preferably, the alkaline wash is an ultrasonic alkaline wash.
Preferably, the alkaline washing solution is a sodium bicarbonate solution, more preferably, the concentration of sodium bicarbonate in the sodium bicarbonate solution is 3 to 7wt%.
Preferably, the total surface area of the sample neutralized by 300ml volume of alkaline solution is 80-100 cm 2 When the total surface area of the test sample is outside the above range, the alkaline solution should be replaced again or the volume of the alkaline solution should be increased proportionally.
Preferably, the ultrasonic time is 3-7 min, and the ultrasonic frequency is 30-50 KHz.
In an alternative embodiment, the method further comprises coating the non-coating area of the sample with resin before pickling, so as to protect the sample and prevent other areas without the coating of the sample from being corroded by the pickling solution.
Preferably, the coating means comprises any one of uv lamp curing or infrared curing; more preferably, the time of ultraviolet lamp curing is 3 to 7min.
Preferably, the resin includes any one of acrylic epoxy resin or silicone rubber.
Preferably, the thickness of the resin coating is 3 to 5mm.
In an alternative embodiment, the method further comprises post-treating the sample after the alkaline washing, wherein the post-treating comprises removing the resin, washing and drying.
Preferably, the resin removal and cleaning comprises soaking the sample in water at 85-95 ℃ for 5-10 min, and cleaning with water after the resin falls off.
Preferably, the drying comprises hot air drying after removing water by using compressed air; more preferably, the pressure of the compressed air is 0.25-0.3 MPa, the blowing time is 0.5-2 min, the temperature of the hot air drying is 110-130 ℃, and the drying time is 20-40 min.
In an alternative embodiment, the coating is a MCrAlYX coating, where M is at least one of Ni and Co and X is at least one of La, ru, re, Y, hf, zr, ce, pt and Dy.
In an alternative embodiment, the coating comprises deposition using at least one of magnetron sputtering, arc ion plating, or electron beam evaporation plating.
In an alternative embodiment, the coating is not subjected to vacuum heat treatment.
The MCrAlYX coating obtained by the method has higher density. The pickling solution and the method for removing the coating in the embodiment of the invention can achieve a good removing effect on the coating, particularly the MCrAlYX coating on the surface of the nickel-based superalloy.
In a third aspect, the present invention provides a use of the solvent for removing a coating according to any one of the preceding embodiments or the method for removing a coating according to any one of the preceding embodiments in the field of surface treatment.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a method for removing a coating, wherein the coating is a NiCoCrAlYTa coating deposited on the surface of a nickel-based superalloy DZ22B by adopting an arc ion plating process, and the method comprises the following steps:
s01, preparing a solvent for removing the coating
Mixing 50% by volume of hydrochloric acid solution, 1wt.% of copper sulfate and 1wt.% of nut oil, and then performing magnetic stirring until the mixture is uniformly mixed to obtain the solvent for removing the coating.
S02, acid pickling
And coating acrylic epoxy resin on the uncoated area of the surface of the nickel-based superalloy, and then irradiating for 5min by using an ultraviolet lamp to completely cure the resin.
And (3) placing the alloy in a solvent with the coating removed at 55 ℃ for reaction, ensuring that the coating is completely immersed in the solvent, keeping the temperature unchanged, and reacting for 10min. After the reaction is finished, the reaction kettle is cleaned by clean flowing water for 1min.
S03, sandblasting
And taking out the cleaned alloy, and performing wet sand blasting by adopting corundum with the particle size of 150 meshes to remove the residual coating. The pressure of the wet sand blasting is 0.5MPa, the distance between the coating and the sand blasting port is 18cm, the angle of the wet sand blasting is 90 degrees, the time of the wet sand blasting is 5min, and sand grains attached to the surface are removed by flushing with clear water after the wet sand blasting is finished.
S04, alkali washing
Prepared with 5wt.% of Na 2 HCO 3 Solution: weighing 15g of anhydrous Na 2 HCO 3 The granules are poured into 300ml of deionized water and stirred for 3min on a magnetic stirrer with the rotating speed of 300rpm until the mixture is Na 2 HCO 3 And completely dissolving.
Placing the alloy obtained in the S03 step in 5wt.% of Na 2 HCO 3 Ultrasonic cleaning in solution for 5min.
S05, post-treatment
And (4) placing the alloy obtained in the step (S04) in clean flowing water for cleaning, then placing the alloy in deionized water at 90 ℃ for soaking for 5min, gradually expanding bubbles on the surface of the resin adhesive to separate the resin adhesive from the alloy matrix in the protection area, directly stripping the resin adhesive, and taking out the alloy. Most of moisture on the surface of the alloy is removed by using compressed air, and then the alloy is placed into a hot air drying oven, wherein the pressure of the compressed air is 0.25MPa, and the drying temperature is 120 ℃.
As shown in fig. 1, in this example, after the alloy is acid-washed with the solvent for removing the coating layer, a large number of voids are generated in the coating layer on the surface of the alloy, and the coating layer can be well detached from the surface of the alloy substrate. As shown in FIG. 2, in the present example, the pickled coating is subjected to wet blasting treatment, and the obtained alloy has no residual coating on the surface and the cross section and no corrosion phenomenon on the alloy substrate.
Through detection, in the embodiment, the dense NiCoCrAlYTa coating on the surface of the DZ22B nickel-based alloy is removed, and the rate of solvent corrosion of the coating is 2 x 10 -2 g·cm -2 ·min -1 。
Example 2
The embodiment provides a method for removing a coating, wherein the coating is a NiCrAlY coating deposited on the surface of a nickel-based superalloy N5 by adopting a magnetron sputtering process, and the method comprises the following steps:
s01, preparing a solvent for removing the coating
Mixing 30% by volume of hydrochloric acid solution, 1wt.% of copper sulfate and 1wt.% of nut oil, and then performing magnetic stirring until the mixture is uniformly mixed to obtain the solvent for removing the coating.
S02, acid pickling
And coating acrylic epoxy resin on the uncoated area of the surface of the nickel-based superalloy, and then irradiating for 5min by using an ultraviolet lamp to completely cure the resin.
And (3) placing the alloy in a solvent with the coating removed at 50 ℃ for reaction, ensuring that the coating is completely immersed in the solvent, keeping the temperature unchanged, and reacting for 10min. After the reaction is finished, the reaction kettle is cleaned by clean flowing water for 1min.
S03, sandblasting
And taking out the cleaned alloy, and performing wet sand blasting by adopting corundum with the particle size of 80 meshes to remove the residual coating. The pressure of the wet sand blasting is 0.3MPa, the distance between the coating and the sand blasting port is 15cm, the angle of the wet sand blasting is 70 degrees, the time of the wet sand blasting is 5min, and sand grains attached to the surface are removed by flushing with clear water after the wet sand blasting is finished.
S04, alkali washing
Prepared with 5wt.% of Na 2 HCO 3 Solution: weighing 15g of anhydrous Na 2 HCO 3 The granules are poured into 300ml of deionized water and are placed on a magnetic stirrer with the rotating speed of 300rpm and stirred for 3min until Na 2 HCO 3 And completely dissolving.
Placing the alloy obtained in the S03 step in 5wt.% of Na 2 HCO 3 Ultrasonic cleaning in solution for 5min.
S05, post-treatment
And (4) placing the alloy obtained in the step (S04) in clean flowing water for cleaning, then placing the alloy in deionized water at 85 ℃ for soaking for 5min, gradually expanding bubbles on the surface of the resin adhesive to separate the resin adhesive from the alloy matrix in the protection area, directly stripping the resin adhesive, and taking out the alloy. Most of moisture on the surface of the alloy is removed by using compressed air, and then the alloy is placed into a hot air drying oven, wherein the pressure of the compressed air is 0.3MPa, and the drying temperature is 120 ℃.
Through detection, the dense NiCrAlY coating on the surface of the N5 nickel-based alloy is removed by the embodiment, and the chemical solution corrosion coating rate is 2 x 10 -2 g·cm -2 ·min -1 After the residual coating is removed by wet sand blasting, the surface and the section of the alloy have no residual coating, and the phenomenon of corroding the alloy matrix does not exist.
Example 3
The embodiment provides a method for removing a coating, wherein the coating is a NiCoCrAlYSiHf coating deposited on the surface of a nickel-based superalloy K38G by adopting a magnetron sputtering process, and the method comprises the following steps:
s01, preparing a solvent for removing the coating
Mixing 40% by volume of hydrochloric acid solution, 1wt.% of copper sulfate and 1wt.% of nut oil, and then performing magnetic stirring until the mixture is uniformly mixed to obtain the solvent for removing the coating.
S02, acid pickling
And coating acrylic epoxy resin on the uncoated area of the surface of the nickel-based superalloy, and then irradiating for 5min by using an ultraviolet lamp to completely cure the resin.
And (3) placing the alloy in a solvent with the coating removed at 60 ℃ for reaction, ensuring that the coating is completely immersed in the solvent, keeping the temperature unchanged, and reacting for 10min. After the reaction is finished, the reaction kettle is cleaned by clean flowing water for 1min.
S03, sandblasting
And taking out the cleaned alloy, and performing wet sand blasting by adopting corundum with the particle size of 180 meshes to remove the residual coating. The pressure of the wet sand blasting is 0.45MPa, the distance between the coating and the sand blasting port is 20cm, the angle of the wet sand blasting is 110 degrees, the time of the wet sand blasting is 5min, and sand grains attached to the surface are removed by flushing with clear water after the wet sand blasting is finished.
S04, alkali washing
Prepared with 5wt.% of Na 2 HCO 3 Solution: weighing 15g of anhydrous Na 2 HCO 3 The granules were poured into 300ml of deionized water and placed under a magnetic force at 300rpmStirring on a stirrer for 3min until Na 2 HCO 3 And completely dissolving.
Placing the alloy obtained in the S03 step in 5wt.% of Na 2 HCO 3 Ultrasonic cleaning in solution for 5min.
S05, post-treatment
And (4) placing the alloy obtained in the step (S04) in clean flowing water for cleaning, then placing the alloy in deionized water at 95 ℃ for soaking for 5min, gradually expanding bubbles on the surface of the resin adhesive to separate the resin adhesive from the alloy matrix in the protection area, directly stripping the resin adhesive, and taking out the alloy. Most of moisture on the surface of the alloy is removed by using compressed air, and then the alloy is placed into a hot air drying oven, wherein the pressure of the compressed air is 0.25MPa, and the drying temperature is 120 ℃.
It is observed that the solvent and the method for removing the coating provided by the embodiment can also remove the dense NiCoCrAlYSiHf coating on the surface of the K38G nickel-based alloy.
Comparative example 1
This comparative example provides a method of removing a coating, where the coating and alloy samples are the same as in example 1, and the removal method is similar except that: the acid washing reaction time is 30min, and the wet sand blasting treatment is carried out without an S03 step.
As shown in FIG. 3, the surface coating can be completely removed by using the solvent for removing the coating alone, but the cross section of the alloy substrate is observed, and the solvent for removing the coating can cause local pitting corrosion on the substrate and damage the surface appearance of the substrate.
Comparative example 2
This comparative example provides a method of removing a coating, where the coating and alloy samples are the same as in example 1, and the removal method is similar except that: the volume fraction of hydrochloric acid added to the solvent for removing the coating was 20%.
Since the content of hydrochloric acid in the solvent for removing the coating is reduced, the chemical etching capability of the solvent during pickling is reduced, and the rate of corrosion of the coating by the solvent is reduced, as shown in fig. 4, even though the wet blasting treatment is performed, a part of the coating still remains on the surface of the alloy.
Comparative example 3
This comparative example provides a method of removing a coating, where both the coating and the alloy sample are the same as example 1, except that: the mass percent of copper sulfate added to the coating removal solvent was 3wt.%.
It was observed that the solvent and method for removing the coating provided by the present comparative example could not completely remove the coating from the alloy surface and the corrosion process was slow.
Comparative example 4
This comparative example provides a method of removing a coating, where both the coating and the alloy sample are the same as example 1, except that: the temperature of the solvent during pickling is 40 ℃ when the coating is removed.
It was observed that the solvent and method for removing the coating provided by the present comparative example could not completely remove the coating on the alloy surface, and the corrosion process was slow due to the low corrosion temperature.
Comparative example 5
This comparative example provides a method of removing a coating, where both the coating and the alloy sample are the same as example 1, except that: the solvent for removing the coating is nitric acid with the volume fraction of 30%, copper sulfate with the mass percentage of 1wt.% and rutin with the mass percentage of 1 wt.%.
As shown in fig. 5, the solvent and method for removing the coating provided by the present comparative example can not substantially remove the coating on the surface of the alloy, and the corrosion process is rather slow.
Comparative example 6
This comparative example provides a method of removing a coating, where both the coating and the alloy sample are the same as example 1, except that: the solvent for removing the coating is phosphoric acid with a volume fraction of 50%, copper sulfate with a mass percentage of 1wt.% and rutin with a mass percentage of 1 wt.%.
As shown in fig. 6, the solvent and method for removing the coating provided by the present comparative example cannot substantially completely remove the coating from the surface of the alloy, and the corrosion process is slow.
Comparative example 7
This comparative example provides a method of removing a coating, where both the coating and the alloy sample are the same as example 1, except that: the sand blasting pressure is 0.2MPa.
It was observed that the method for removing the coating provided by the present comparative example could not substantially completely remove the coating from the alloy surface, and the coating remained on the surface due to the smaller blasting pressure.
In summary, the solvent for removing a coating, the method for removing a coating and the application provided by the embodiments of the present invention have the following advantages:
in the solvent for removing the coating, hydrochloric acid is used as a main corrosion solvent, and the addition of the copper sulfate solution can further improve the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness or occurrence of notches and the like, and meanwhile, the corrosion inhibitor is added into the pickling solution to prevent a sample substrate from being corroded by the hydrochloric acid, so that the solvent can remove a compact high-temperature protective coating on the surface of the sample, and can effectively relieve the influence of pickling on the surface structure and the appearance of the substrate.
The sample containing the coating is placed in the solvent for removing the coating, hydrochloric acid is used as a main corrosion solvent, and copper sulfate is used for assisting in improving the corrosion capability of the hydrochloric acid, so that the coating is etched into a loose structure through defects on the surface of the coating, such as uneven thickness or occurrence of concave gaps and the like, then the pickled sample is subjected to sand blasting treatment, and the residual coating is removed completely by utilizing the mechanical force cutting effect of the sand blasting. Meanwhile, the corrosion inhibitor is added into the pickling solution to prevent the sample matrix from being corroded by hydrochloric acid. The method can remove the compact high-temperature protective coating on the surface of the sample, can effectively relieve the influence of acid washing on the surface tissue and the appearance of the matrix, has simple operation flow, and can be applied to large-scale production.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The solvent for removing the coating is characterized by comprising 30-50% of hydrochloric acid by volume fraction, 1-2 wt% of copper sulfate by mass fraction and 1-2 wt% of corrosion inhibitor by mass fraction.
2. The solvent for removing a coating according to claim 1, wherein the corrosion inhibitor is ftivadine.
3. A method for removing a coating layer, comprising subjecting a sample containing a coating layer to sand blasting after pickling in the coating layer-removing solvent according to claim 1 or 2.
4. The method for removing coating according to claim 3, wherein the solvent temperature of the acid washing reaction is 50-60 ℃ and the reaction time is 10-15 min.
5. The method of removing a coating according to claim 3, wherein the blasting is a wet blasting, the wet blasted grit comprising any one of corundum or quartz sand;
preferably, the grain size of the sand grains is 80-180 meshes, the sand blasting pressure is 0.3-0.5 MPa, the distance between the sample and the wet sand blasting port is 15-20 cm, and the sand blasting angle is 70-110 degrees;
preferably, the step of cleaning the sample before the sand blasting is further included.
6. The method for removing the coating according to claim 3, further comprising performing alkali washing on the test sample after the sand blasting is finished; preferably, the alkali washing is ultrasonic alkali washing;
preferably, the alkaline solution is sodium bicarbonate solution, and more preferably, the concentration of the sodium bicarbonate in the sodium bicarbonate solution is 3-7 wt%;
preferably, the ultrasonic time is 3-7 min, and the ultrasonic frequency is 30-50 KHz.
7. The method of claim 6, further comprising coating the uncoated regions of the sample with a resin prior to pickling;
preferably, the coating means comprises any one of uv lamp curing or infrared lamp;
preferably, the resin includes any one of acrylic epoxy resin or silicone rubber;
preferably, the thickness of the resin coating is 3 to 5mm.
8. The method of removing a coating according to claim 7, further comprising post-treating the sample after the alkaline washing, the post-treating comprising removing resin, washing and drying;
preferably, the resin removal comprises soaking the sample in water at 85-95 ℃ for 5-10 min;
preferably, the washing comprises washing with water;
preferably, the drying comprises hot air drying after water removal by using compressed air; more preferably, the pressure of the compressed air is 0.25-0.3 MPa, the blowing time is 0.5-2 min, the temperature of the hot air drying is 110-130 ℃, and the drying time is 20-40 min.
9. The method of removing a coating of claim 3, wherein the coating is a MCrAlYX coating, wherein M is at least one of Ni and Co, and X is at least one of La, ru, re, Y, hf, zr, ce, pt, and Dy;
preferably, the coating comprises deposition by at least one of magnetron sputtering, arc ion plating or electron beam evaporation plating;
preferably, the coating is not subjected to vacuum heat treatment.
10. Use of a solvent for removing a coating according to claim 1 or 2 or a method for removing a coating according to any one of claims 3 to 9 in the field of surface treatment.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109321919A (en) * | 2018-11-14 | 2019-02-12 | 中国航发动力股份有限公司 | A kind of chemical method of the MCrAlY coating removal on high temperature alloy part |
| CN112981406A (en) * | 2021-02-03 | 2021-06-18 | 安徽应流航源动力科技有限公司 | Surface grain corrosion method of IN718C nickel-based superalloy aviation bearing seat |
| CN113969405A (en) * | 2021-10-27 | 2022-01-25 | 中国航发贵州黎阳航空动力有限公司 | Method for removing NiCrAlY coating of aeroengine blade |
| CN114107993A (en) * | 2021-11-23 | 2022-03-01 | 华瑞（江苏）燃机服务有限公司 | Acid washing stripping process for metal bonding layer of turbine moving blade of gas turbine |
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- 2022-10-09 CN CN202211229701.3A patent/CN115537824A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109321919A (en) * | 2018-11-14 | 2019-02-12 | 中国航发动力股份有限公司 | A kind of chemical method of the MCrAlY coating removal on high temperature alloy part |
| CN112981406A (en) * | 2021-02-03 | 2021-06-18 | 安徽应流航源动力科技有限公司 | Surface grain corrosion method of IN718C nickel-based superalloy aviation bearing seat |
| CN113969405A (en) * | 2021-10-27 | 2022-01-25 | 中国航发贵州黎阳航空动力有限公司 | Method for removing NiCrAlY coating of aeroengine blade |
| CN114107993A (en) * | 2021-11-23 | 2022-03-01 | 华瑞（江苏）燃机服务有限公司 | Acid washing stripping process for metal bonding layer of turbine moving blade of gas turbine |
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