CN109321919A - A kind of chemical method of the MCrAlY coating removal on high temperature alloy part - Google Patents
A kind of chemical method of the MCrAlY coating removal on high temperature alloy part Download PDFInfo
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- CN109321919A CN109321919A CN201811354952.8A CN201811354952A CN109321919A CN 109321919 A CN109321919 A CN 109321919A CN 201811354952 A CN201811354952 A CN 201811354952A CN 109321919 A CN109321919 A CN 109321919A
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- Prior art keywords
- high temperature
- temperature alloy
- alloy part
- mcraly coating
- coating removal
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- 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
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- 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 kind of chemical methodes of MCrAlY coating removal on high temperature alloy part, carry out complete oil removing to high temperature alloy piece surface, then that high temperature alloy part is dry；Prepare MCrAlY coating removal solution: the formula of the MCrAlY coating removal solution is with volume fraction, if the fourth of hydrochloric acid and 1-10% including 90-99%；Removal MCrAlY coating: high temperature alloy part is put into MCrAlY coating removal solution and is handled；Scrub part: scrub high temperature alloy part；Cleaning part: high temperature alloy part is immediately placed in clean circulating water and is rinsed well；It neutralizes part: high temperature alloy part is immediately placed in Na2CO3It is neutralized in solution；Cleaning part: by high temperature alloy part be immediately placed in clean circulating water and rinse well, and it is dry.The present invention can effectively remove MCrAlY coating on high temperature alloy part, and will not generate corrosion to basis material.
Description
Technical field
The invention belongs to process for treating surface, for removing MCrAlY coating on high temperature alloy part, and in particular to a kind of
The chemical method of MCrAlY coating removal on high temperature alloy part provides qualified surface state for applying coating again.
Background technique
To ensure that high temperature alloy part meets the requirement of its resistance to high temperature oxidation, coated in piece surface certain thickness
MCrAlY coating, in coating deposition process, because equipment state it is unstable caused by appearance of coat or performance it is exceeded；Test run and make
With in the process because of local chip off-falling and peeling caused by coating binding force difference；It is unexpected and during part turnover carrying, assembly etc.
Collide with etc. caused by coating damage, cause coating quality not meet relevant design and require and need to coat again.Due to state
It is interior currently without suitable MCrAlY coating removal technique, cause the defective part of coating to be unable to get and reprocess in time, cause
The significant wastage of production cost.
Summary of the invention
The purpose of the present invention is to provide a kind of chemical method of MCrAlY coating removal on high temperature alloy part, with
Problem of the prior art is solved, the present invention can effectively remove MCrAlY coating on high temperature alloy part, and will not be to matrix material
Material generates corrosion.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of chemical method of the MCrAlY coating removal on high temperature alloy part, comprising the following steps:
Step 1: complete oil removing is carried out to high temperature alloy piece surface, it is then that high temperature alloy part is dry；
Step 2: prepare MCrAlY coating removal solution: the MCrAlY coating removal solution with volume fraction, including
If the hydrochloric acid of 90-99% and the fourth of 1-10%；
Step 3: removal MCrAlY coating: will treated that high temperature alloy part is put into MCrAlY coating through step 1
Except being handled in solution；
Step 4: scrub part: scrub is through step 3 treated high temperature alloy part；
Step 5: cleaning part: will treated that high temperature alloy part is immediately placed in clean circulating water through step 4
It rinses well；
Step 6: neutralize part: will through step 5 treated that high temperature alloy part is immediately placed in Na2CO3It is carried out in solution
It neutralizes；
Step 7: wash and dry part: will through step 6 treated that high temperature alloy part is immediately placed in clean stream
It is rinsed well in dynamic water, and dry.
Further, oil removing is carried out to high temperature alloy piece surface using aqueous cleaning agent in step 1, and is connected with moisture film
Continuous test method examines surface deoiling effect, guarantees that surface degreasing is complete, is then dried up high temperature alloy part with compressed air.
Further, the specific gravity of hydrochloric acid is 1.16g/cm in step 23。
Further, hydrochloric acid and Ruo Ding are that chemistry is pure in step 2.
Further, treatment temperature is 25-50 DEG C of in step 3
Further, it is 2-5 hours that the time is handled in step 3.
Further, washing time is 1-2min in step 4.
Further, neutralization temperature is room temperature in step 5.
Further, it is 3min that the time is neutralized in step 5.
Further, Na in step 52CO3The mass concentration of solution is 30%-70%.
Compared with prior art, the invention has the following beneficial technical effects:
The dominant mechanism of the method for the present invention is that there are potential difference, coating removal solution between MCrAlY coating and basis material
As electrolyte, electrochemical reaction is generated, to effectively remove MCrAlY coating on high temperature alloy part, and will not be to matrix material
Material generates corrosion.Meanwhile the coating reprocess after part can be coated again, greatly reduce manufacturing cost.
Detailed description of the invention
Fig. 1 is metallographic examination photo after 1 part coating removal of embodiment；
Fig. 2 is metallographic examination photo after 2 part coating removal of embodiment.
Specific embodiment
Present invention is further described in detail below:
A kind of chemical minimizing technology of the MCrAlY coating on high temperature alloy part, steps are as follows:
1, piece surface oil removing；Oil removing is carried out with aqueous cleaning agent to piece surface, and with the inspection of moisture film long run test method
Surface degreasing effect is tested, guarantees that surface degreasing is complete, is then dried up part with compressed air；
2, MCrAlY coating removal solution is prepared；The formula of solution is as follows: hydrochloric acid (specific gravity 1.16): its volume ratio is 90-
99%；If fourth: its volume ratio 1-10%；Hydrochloric acid is that chemistry is pure；If fourth is that chemistry is pure；Preparation method are as follows: the hydrochloric acid that will be calculated
It pours into suitable container, if a certain amount of fourth is added；
3, MCrAlY coating is removed；Heat coating removal solution can be used to operating temperature (25-50) DEG C；Part is delayed
Slow play enters to fill in the container of coating removal solution, and part can not be stacked or be covered between each other, and part is totally submerged, and goes forward side by side
Row stirring, impregnates 2-5h, until the no longer obvious bubbling of piece surface, takes out；
4, part is scrubbed；The dust generated with banister brush scrub piece surface reaction；
5, part is cleaned；Part is immediately placed in clean circulating water and is rinsed well, and is dry.
6, part is neutralized；Part is immediately placed in the Na of the 30-70% (weight percent) of room temperature2CO3In being carried out in solution
With, it is ensured that the remaining sour mark of removal piece surface；
7, part is cleaned；Part is immediately placed in clean circulating water and is rinsed well, and is dry.
Operating process of the embodiment of the present invention is described in detail below:
Embodiment 1
Certain nickel base superalloy (material trademark are as follows: 88 у alloy of ч с) part.Piece surface MCrAlY coating is because coating matter
It measures and bad coating localized delamination occurs.
The step of removing MCrAlY coating is as follows:
1, testpieces is placed in about 30min in 40 DEG C of aqueous-base cleaning agent solution, water is rinsed and tried with water break later
After proved recipe method examines its cleaning oil-free, its surface is dried up with compressed air.
2, in the environment of having exhaust equipment, removal solution is prepared:
Hydrochloric acid (pure, the specific gravity 1.16g/cm of chemistry3) 98% (v/v)
If fourth: (chemistry is pure) 2% (v/v)
3, part is placed in the coating removal solution that temperature is 38 DEG C, it is ensured that part is totally submerged, and without mutual masking
Or overlapping.
4, part takes out after impregnating 240min in coating removal solution.
5, the dust of piece surface is scrubbed clean with banister brush.
6, the remaining dust of piece surface is rinsed well with circulating water.
7, part is neutralized.The Na that mass concentration at room temperature is 44%2CO3Part is neutralized in solution, the time is
3min。
8, part is washed and dried.
9, Dissection test part, as seen from Figure 1, metal lographic examination surface are remained without visible coating.
Embodiment 2
Certain nickel base superalloy (material trademark are as follows: K444 alloy) part.There is coating office in piece surface MCrAlY coating
It peels off in portion.
The step of removing MCrAlY coating is as follows:
1, testpieces is placed in about 30min in 42 DEG C of aqueous-base cleaning agent solution, water is rinsed and tried with water break later
After proved recipe method examines its cleaning oil-free, its surface is dried up with compressed air.
2, in the environment of having exhaust equipment, removal solution is prepared:
Hydrochloric acid (pure, the specific gravity 1.16g/cm of chemistry3) 99% (v/v)
If fourth: (chemistry is pure) 1% (v/v)
3, part is placed in the coating removal solution that temperature is 42 DEG C, it is ensured that part is totally submerged, and without mutual masking
Or overlapping.
4, part takes out after impregnating 270min in coating removal solution.
5, the dust of piece surface is scrubbed clean with banister brush.
6, the remaining dust of piece surface is rinsed well with circulating water.
7, part is neutralized.The Na that mass concentration at room temperature is 50%2CO3Part is neutralized in solution, the time is
3min。
8, part is washed and dried.
9, Dissection test part, as seen from Figure 2, metal lographic examination surface are remained without visible coating.
Embodiment 3
Certain nickel base superalloy (material trademark are as follows: K444 alloy) part.There is coating office in piece surface MCrAlY coating
It peels off in portion.
The step of removing MCrAlY coating is as follows:
1, testpieces is placed in about 30min in 42 DEG C of aqueous-base cleaning agent solution, water is rinsed and tried with water break later
After proved recipe method examines its cleaning oil-free, its surface is dried up with compressed air.
2, in the environment of having exhaust equipment, removal solution is prepared:
Hydrochloric acid (pure, the specific gravity 1.16g/cm of chemistry3) 90% (v/v)
If fourth: (chemistry is pure) 10% (v/v)
3, part is placed in the coating removal solution that temperature is 50 DEG C, it is ensured that part is totally submerged, and without mutual masking
Or overlapping.
4, part takes out after impregnating 120min in coating removal solution.
5, the dust of piece surface is scrubbed clean with banister brush.
6, the remaining dust of piece surface is rinsed well with circulating water.
7, part is neutralized.The Na that mass concentration at room temperature is 70%2CO3Part is neutralized in solution, the time is
3min。
8, part is washed and dried.
9, Dissection test part, metal lographic examination surface are remained without visible coating.
Embodiment 4
Certain nickel base superalloy (material trademark are as follows: 88 у alloy of ч с) part.Piece surface MCrAlY coating is because coating matter
It measures and bad coating localized delamination occurs.
The step of removing MCrAlY coating is as follows:
1, testpieces is placed in about 30min in 40 DEG C of aqueous-base cleaning agent solution, water is rinsed and tried with water break later
After proved recipe method examines its cleaning oil-free, its surface is dried up with compressed air.
2, in the environment of having exhaust equipment, removal solution is prepared:
Hydrochloric acid (pure, the specific gravity 1.16g/cm of chemistry3) 94% (v/v)
If fourth: (chemistry is pure) 6% (v/v)
3, part is placed in the coating removal solution that temperature is 25 DEG C, it is ensured that part is totally submerged, and without mutual masking
Or overlapping.
4, part takes out after impregnating 300min in coating removal solution.
5, the dust of piece surface is scrubbed clean with banister brush.
6, the remaining dust of piece surface is rinsed well with circulating water.
7, part is neutralized.The Na that mass concentration at room temperature is 30%2CO3Part is neutralized in solution, the time is
3min。
8, part is washed and dried.
9, Dissection test part, metal lographic examination surface are remained without visible coating.
Claims (10)
1. a kind of chemical method of the MCrAlY coating removal on high temperature alloy part, which comprises the following steps:
Step 1: complete oil removing is carried out to high temperature alloy piece surface, it is then that high temperature alloy part is dry；
Step 2: preparing MCrAlY coating removal solution: the MCrAlY coating removal solution is with volume fraction, including 90-
If 99% hydrochloric acid and the fourth of 1-10%；
Step 3: removal MCrAlY coating: will treated that high temperature alloy part is put into MCrAlY coating removal is molten through step 1
It is handled in liquid；
Step 4: scrub part: scrub is through step 3 treated high temperature alloy part；
Step 5: cleaning part: will treated that high temperature alloy part is immediately placed in clean circulating water rinses through step 4
Completely；
Step 6: neutralize part: will through step 5 treated that high temperature alloy part is immediately placed in Na2CO3In being carried out in solution
With；
Step 7: wash and dry part: will through step 6 treated that high temperature alloy part is immediately placed in clean circulating water
In rinse well, and it is dry.
2. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is, carries out oil removing to high temperature alloy piece surface using aqueous cleaning agent in step 1, and in moisture film long run test method
Surface deoiling effect is examined, guarantees that surface degreasing is complete, is then dried up high temperature alloy part with compressed air.
3. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that the specific gravity of hydrochloric acid is 1.16g/cm in step 23。
4. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that hydrochloric acid and Ruo Ding are that chemistry is pure in step 2.
5. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that treatment temperature is 25-50 DEG C in step 3.
6. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that it is 2-5 hours that the time is handled in step 3.
7. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that washing time is 1-2min in step 4.
8. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that neutralization temperature is room temperature in step 5.
9. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is that it is 3min that the time is neutralized in step 5.
10. a kind of chemical method of MCrAlY coating removal on high temperature alloy part according to claim 1, special
Sign is, Na in step 52CO3The mass concentration of solution is 30%-70%.
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| CN201811354952.8A CN109321919A (en) | 2018-11-14 | 2018-11-14 | A kind of chemical method of the MCrAlY coating removal on high temperature alloy part |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111748818A (en) * | 2020-06-30 | 2020-10-09 | 中国航发动力股份有限公司 | Solution and method for quickly removing nickel-cadmium diffusion layer on surface of structural steel |
| CN114075690A (en) * | 2020-08-14 | 2022-02-22 | 中国科学院金属研究所 | Method for electrochemically removing MCrAlY coating |
| CN115537824A (en) * | 2022-10-09 | 2022-12-30 | 广东省科学院新材料研究所 | Solvent for removing coating, method for removing coating and application |
| CN115595581A (en) * | 2022-11-10 | 2023-01-13 | 上海电气燃气轮机有限公司（Cn） | Method for removing adhesive layer of thermal part after service |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111748818A (en) * | 2020-06-30 | 2020-10-09 | 中国航发动力股份有限公司 | Solution and method for quickly removing nickel-cadmium diffusion layer on surface of structural steel |
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| CN115595581B (en) * | 2022-11-10 | 2024-04-26 | 上海电气燃气轮机有限公司 | Method for removing bonding layer of thermal component after service |
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Application publication date: 20190212 |