CN107287554A - A kind of surface processing method for coal mining mechanical parts - Google Patents
A kind of surface processing method for coal mining mechanical parts Download PDFInfo
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- CN107287554A CN107287554A CN201710563502.9A CN201710563502A CN107287554A CN 107287554 A CN107287554 A CN 107287554A CN 201710563502 A CN201710563502 A CN 201710563502A CN 107287554 A CN107287554 A CN 107287554A
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- coal mining
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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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/58—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
- C09D5/10—Anti-corrosive paints containing metal dust
- C09D5/103—Anti-corrosive paints containing metal dust containing Al
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Detergent Compositions (AREA)
Abstract
The invention belongs to mechanical surface treatment technical field there is provided a kind of surface processing method for coal mining mechanical parts, including（1）Cleaning treatment；（2）The pre-heat treatment；（3）Nitrogen treatment；（4）Oxidation processes；（5）Cooling treatment；（6）Rust prevention by applying liquid material paint.The surface processing method for coal mining mechanical parts that the present invention is provided, machinery part surface corrosion resistance after being handled using this method improves more than 7 than chromium plating and nickel plating, it is higher more than 11 times than zinc-plated, than turning blue, processing is high more than 21 times, case hardness reaches more than 50HRC, far above chromium plating and nickel plating and processing case hardness of turning blue.Meanwhile, the method cost of this surface treatment is relatively low, while environmental sound, can be widely used for the processing of coal mine machinery piece surface.
Description
Technical field
The invention belongs to mechanical surface treatment technical field, in particular it relates to a kind of coal mine machinery piece surface processing side
Method.
Background technology
Coal mine machinery it requires that equipment part is wear-resistant, anticorrosive because use environment is severe, reliability requirement is high,
Primarily now using chromium plating or nickel plating process, the methods such as processing of turning blue, but the above method is present that case hardness is relatively low, corrosion resistance
It is poor, the shortcomings of cost is higher.Domestic common Quench-Polish-Quench technology technology, at less workpiece surface
Reason, the surface treatment of such as machine tool, due to salt bath formula, if nitriding temperature is too low, it is impossible to form deep enough
The infiltration layer of degree；And nitriding temperature is too high, surface porosity layer is serious, and temperature, which exceedes temperature, can then reduce the hardness of matrix, together
When conventional nitridation salt in cyanide have severe toxicity, have larger harm to environment.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of surface processing method for coal mining mechanical parts.
A kind of surface processing method for coal mining mechanical parts provided according to the present invention, methods described includes following process：
（1）Cleaning treatment：
Coal mine machinery part is placed in cleaning agent, cleaned using ultrasonic wave, the dirt of piece surface is peeled off and come off, it is described clear
Vibration frequency range is washed in 70-90kHz, power density is set in 0.6-0.7W/C；
（2）The pre-heat treatment：
Coal mine machinery part is put into external-heat crucible electric furnace, 300-500 DEG C of keeping temperature, time 20-30min；
（3）Nitrogen treatment：
Processed workpiece is put into the crucible electric furnace equipped with liquid nitrogen salt dissolving, in the liquid after immersion nitridation salt melting, kept
350-480 DEG C of temperature, time 1.5-2.8h；
（4）Oxidation processes：
Coal mine machinery part is put into the crucible electric furnace equipped with liquid oxygen salt dissolving, in the liquid after immersion saline oxide melting, protected
Hold 255-300 DEG C of temperature, time 46-50min；
（5）Cooling treatment：
Coal mine machinery part is taken out out of crucible electric furnace, is placed in air and naturally cools to room temperature；
（6）Rust prevention by applying liquid material paint：
The machinery part surface being sprayed on after the cooling period will be painted, then carry out high-temperature baking, baking temperature is 150-450 DEG C, toasted
Time is 10-40min.
Preferably, the raw material of the nitridation salt is prepared by following parts by weight：40-50 parts of urea, 10-20 parts of potassium carbonate, carbon
Sour lithium 5-10 parts, 6-10 parts of sodium chloride.
Preferably, the raw material of the saline oxide is prepared by following parts by weight：11-18 parts of sodium nitrate, 9-15 parts of sodium sulphate, nitre
Sour potassium 7-13 parts.
Preferably, the step（1）In cleaning agent be aqueous cleaning agent.
Preferably, the crucible electric furnace is external heating type.
Preferably, the step（6）In antirust paint include the raw material of following percentage by weight：Aqueous epoxy resins 20-
30%th, ethyl acetate 10-12%, polyvinyl alcohol 3-5%, PTPP 1-3%, ferrotitanium powder 3-5%, diisopropanolamine (DIPA) 2-4%, second two
Amine tetraacethyl 3-5%, swelling perlite powder 4-6%, dispersant 3-5%, defoamer 2-4%, aluminium powder 1-4%, surplus are deionized water.
Preferably, the dispersant is metal soap dispersant.
Preferably, the metal soap dispersant is zinc stearate or calcium stearate.
Compared with prior art, the present invention has following beneficial effect：
（1）The surface processing method for coal mining mechanical parts that the present invention is provided, the machinery part surface after being handled using this method is resistance to
Corrosion improves more than 7 than chromium plating and nickel plating, and higher more than 11 times than zinc-plated, than turning blue, processing is high more than 21 times, and case hardness reaches
More than 50HRC, far above chromium plating and nickel plating and processing case hardness of turning blue.Meanwhile, the method cost of this surface treatment is relatively low, together
When environmental sound, can be widely used for coal mine machinery piece surface processing；
（2）During the nitrogen treatment for the surface processing method for coal mining mechanical parts that the present invention is provided, using the present invention containing new
The nitridation salt of component and content, certain nitrogen gesture can not only be kept under lower temperature state, is stablized at a higher temperature, can
The thickness of process layer is effectively improved, the corrosion resistance of workpiece is further improved.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.
Embodiment 1
A kind of surface processing method for coal mining mechanical parts that the present embodiment is provided, methods described includes following process：
（1）Cleaning treatment：
Coal mine machinery part is placed in cleaning agent, cleaned using ultrasonic wave, the dirt of piece surface is peeled off and come off, it is described clear
Vibration frequency range is washed in 90kHz, power density is set in 0.6W/C, wherein, the cleaning agent is aqueous cleaning agent；
（2）The pre-heat treatment：
Coal mine machinery part is put into external-heat crucible electric furnace, 500 DEG C of keeping temperature, time 20min；
（3）Nitrogen treatment：
Processed workpiece is put into the crucible electric furnace equipped with liquid nitrogen salt dissolving, in the liquid after immersion nitridation salt melting, kept
480 DEG C of temperature, time 1.5h, wherein, the raw material of the nitridation salt is prepared by following parts by weight：50 parts of urea, potassium carbonate 10
Part, 10 parts of lithium carbonate, 6 parts of sodium chloride, 10 parts of potassium hydroxide, wherein, the crucible electric furnace is external heating type；
（4）Oxidation processes：
Coal mine machinery part is put into the crucible electric furnace equipped with liquid oxygen salt dissolving, in the liquid after immersion saline oxide melting, protected
Hold 300 DEG C of temperature, time 46min, wherein, the raw material of the saline oxide is prepared by following parts by weight：18 parts of sodium nitrate, sodium sulphate
9 parts, 13 parts of potassium nitrate, 30 parts of sodium hydroxide, wherein, the crucible electric furnace is external heating type；
（5）Cooling treatment：
Coal mine machinery part is taken out out of crucible electric furnace, is placed in air and naturally cools to room temperature；
（6）Rust prevention by applying liquid material paint：
The machinery part surface being sprayed on after the cooling period will be painted, then carry out high-temperature baking, baking temperature is 450 DEG C, baking time
It is 10min.Wherein, the antirust paint includes the raw material of following percentage by weight：Aqueous epoxy resins 30%, ethyl acetate 10%,
Polyvinyl alcohol 5%, PTPP 1%, ferrotitanium powder 5%, diisopropanolamine (DIPA) 2%, ethylenediamine tetra-acetic acid 5%, swelling perlite powder 4%,
Dispersant 5%, defoamer 2%, aluminium powder 4%, surplus are deionized water.
Wherein, the dispersant is metal soap dispersant.
Wherein, the metal soap dispersant is zinc stearate.
Embodiment 2
A kind of surface processing method for coal mining mechanical parts that the present embodiment is provided, methods described includes following process：
（1）Cleaning treatment：
Coal mine machinery part is placed in cleaning agent, cleaned using ultrasonic wave, the dirt of piece surface is peeled off and come off, it is described clear
Vibration frequency range is washed in 70kHz, power density is set in 0.7W/C, wherein, the cleaning agent is aqueous cleaning agent；
（2）The pre-heat treatment：
Coal mine machinery part is put into external-heat crucible electric furnace, 300 DEG C of keeping temperature, time 30min；
（3）Nitrogen treatment：
Processed workpiece is put into the crucible electric furnace equipped with liquid nitrogen salt dissolving, in the liquid after immersion nitridation salt melting, kept
350 DEG C of temperature, time 2.8h, wherein, the raw material of the nitridation salt is prepared by following parts by weight：40 parts of urea, potassium carbonate 20
Part, 5 parts of lithium carbonate, 10 parts of sodium chloride, 4 parts of potassium hydroxide, wherein, the crucible electric furnace is external heating type；
（4）Oxidation processes：
Coal mine machinery part is put into the crucible electric furnace equipped with liquid oxygen salt dissolving, in the liquid after immersion saline oxide melting, protected
Hold 255 DEG C of temperature, time 50min, wherein, the raw material of the saline oxide is prepared by following parts by weight：11 parts of sodium nitrate, sodium sulphate
15 parts, 7 parts of potassium nitrate, 45 parts of sodium hydroxide, wherein, the crucible electric furnace is external heating type；
（5）Cooling treatment：
Coal mine machinery part is taken out out of crucible electric furnace, is placed in air and naturally cools to room temperature；
（6）Rust prevention by applying liquid material paint：
The machinery part surface being sprayed on after the cooling period will be painted, then carry out high-temperature baking, baking temperature is 150 DEG C, baking time
It is 40min.Wherein, the antirust paint includes the raw material of following percentage by weight：Aqueous epoxy resins 20%, ethyl acetate 12%,
Polyvinyl alcohol 3%, PTPP 3%, ferrotitanium powder 3%, diisopropanolamine (DIPA) 4%, ethylenediamine tetra-acetic acid 3%, swelling perlite powder 6%,
Dispersant 3%, defoamer 4%, aluminium powder 1%, surplus are deionized water.
Wherein, the dispersant is metal soap dispersant.
Wherein, the metal soap dispersant is calcium stearate.
Embodiment 3
A kind of surface processing method for coal mining mechanical parts that the present embodiment is provided, methods described includes following process：
（1）Cleaning treatment：
Coal mine machinery part is placed in cleaning agent, cleaned using ultrasonic wave, the dirt of piece surface is peeled off and come off, it is described clear
Vibration frequency range is washed in 80kHz, power density is set in 0.6W/C, wherein, the cleaning agent is aqueous cleaning agent；
（2）The pre-heat treatment：
Coal mine machinery part is put into external-heat crucible electric furnace, 350 DEG C of keeping temperature, time 25min；
（3）Nitrogen treatment：
Processed workpiece is put into the crucible electric furnace equipped with liquid nitrogen salt dissolving, in the liquid after immersion nitridation salt melting, kept
380 DEG C of temperature, time 1.9h, wherein, the raw material of the nitridation salt is prepared by following parts by weight：42 parts of urea, potassium carbonate 14
Part, 6 parts of lithium carbonate, 7 parts of sodium chloride, 8 parts of potassium hydroxide, wherein, the crucible electric furnace is external heating type；
（4）Oxidation processes：
Coal mine machinery part is put into the crucible electric furnace equipped with liquid oxygen salt dissolving, in the liquid after immersion saline oxide melting, protected
Hold 259 DEG C of temperature, time 48min, wherein, the raw material of the saline oxide is prepared by following parts by weight：14 parts of sodium nitrate, sodium sulphate
11 parts, 9 parts of potassium nitrate, 32 parts of sodium hydroxide, wherein, the crucible electric furnace is external heating type；
（5）Cooling treatment：
Coal mine machinery part is taken out out of crucible electric furnace, is placed in air and naturally cools to room temperature；
（6）Rust prevention by applying liquid material paint：
The machinery part surface being sprayed on after the cooling period will be painted, then carry out high-temperature baking, baking temperature is 190 DEG C, baking time
It is 20min.Wherein, the antirust paint includes the raw material of following percentage by weight：Aqueous epoxy resins 21%, ethyl acetate 12%,
Polyvinyl alcohol 4%, PTPP 2%, ferrotitanium powder 4%, diisopropanolamine (DIPA) 3%, ethylenediamine tetra-acetic acid 4%, swelling perlite powder 5%,
Dispersant 4%, defoamer 4%, aluminium powder 2%, surplus are deionized water.
Wherein, the dispersant is metal soap dispersant.
Wherein, the metal soap dispersant is zinc stearate.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (8)
1. a kind of surface processing method for coal mining mechanical parts, it is characterised in that：Methods described includes following process：
（1）Cleaning treatment：
Coal mine machinery part is placed in cleaning agent, cleaned using ultrasonic wave, the dirt of piece surface is peeled off and come off, it is described clear
Vibration frequency range is washed in 70-90kHz, power density is set in 0.6-0.7W/C；
（2）The pre-heat treatment：
Coal mine machinery part is put into external-heat crucible electric furnace, 300-500 DEG C of keeping temperature, time 20-30min；
（3）Nitrogen treatment：
Processed workpiece is put into the crucible electric furnace equipped with liquid nitrogen salt dissolving, in the liquid after immersion nitridation salt melting, kept
350-480 DEG C of temperature, time 1.5-2.8h；
（4）Oxidation processes：
Coal mine machinery part is put into the crucible electric furnace equipped with liquid oxygen salt dissolving, in the liquid after immersion saline oxide melting, protected
Hold 255-300 DEG C of temperature, time 46-50min；
（5）Cooling treatment：
Coal mine machinery part is taken out out of crucible electric furnace, is placed in air and naturally cools to room temperature；
（6）Rust prevention by applying liquid material paint：
The machinery part surface being sprayed on after the cooling period will be painted, then carry out high-temperature baking, baking temperature is 150-450 DEG C, toasted
Time is 10-40min.
2. surface processing method for coal mining mechanical parts according to claim 1, it is characterised in that：The raw material of the nitridation salt
Prepared by following parts by weight：40-60 parts of urea, 10-20 parts of potassium carbonate, 5-10 parts of lithium carbonate, 6-10 parts of sodium chloride.
3. surface processing method for coal mining mechanical parts according to claim 1, it is characterised in that：The raw material of the saline oxide
Prepared by following parts by weight：11-28 parts of sodium nitrate, 9-15 parts of sodium sulphate, 7-13 parts of potassium nitrate,.
4. surface processing method for coal mining mechanical parts according to claim 1, it is characterised in that：The step（1）In
Cleaning agent is aqueous cleaning agent.
5. surface processing method for coal mining mechanical parts according to claim 1, it is characterised in that：The crucible electric furnace is outer
Heated type.
6. surface processing method for coal mining mechanical parts according to claim 1, it is characterised in that：The step（6）In
Antirust paint includes the raw material of following percentage by weight：Aqueous epoxy resins 20-30%, ethyl acetate 10-12%, polyvinyl alcohol 3-
5%th, PTPP 1-3%, ferrotitanium powder 3-5%, diisopropanolamine (DIPA) 2-4%, ethylenediamine tetra-acetic acid 3-5%, swelling perlite powder 4-
6%th, dispersant 3-5%, defoamer 2-4%, aluminium powder 1-4%, surplus are deionized water.
7. surface processing method for coal mining mechanical parts according to claim 6, it is characterised in that：The dispersant is metal
Soaps dispersant.
8. surface processing method for coal mining mechanical parts according to claim 7, it is characterised in that：The metal soap disperses
Agent is zinc stearate or calcium stearate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710563502.9A CN107287554A (en) | 2017-07-12 | 2017-07-12 | A kind of surface processing method for coal mining mechanical parts |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710563502.9A CN107287554A (en) | 2017-07-12 | 2017-07-12 | A kind of surface processing method for coal mining mechanical parts |
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| CN107287554A true CN107287554A (en) | 2017-10-24 |
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| CN201710563502.9A Withdrawn CN107287554A (en) | 2017-07-12 | 2017-07-12 | A kind of surface processing method for coal mining mechanical parts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107740034A (en) * | 2017-10-27 | 2018-02-27 | 湖州正德轻工机械有限公司 | A kind of surface of workpiece heat treatment method |
| CN114231891A (en) * | 2021-11-23 | 2022-03-25 | 煤炭科学研究总院 | Surface treatment process for coal mine machinery |
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|---|---|---|---|---|
| CN101422858A (en) * | 2007-11-02 | 2009-05-06 | 庞力 | Manufacture method of no-coating abrasion-proof anti-corrosive iron pan |
| CN105506542A (en) * | 2015-12-23 | 2016-04-20 | 四川全丰新材料科技有限公司 | New QPQ nitrocarburizing corrosion resistance process for iron casting surface |
| CN105525254A (en) * | 2015-12-23 | 2016-04-27 | 德阳瑞泰科技有限公司 | Quench-polish-quench (QPQ) salt bath composite processing technology of water hydraulic component |
| CN106498340A (en) * | 2016-11-11 | 2017-03-15 | 重庆动沃机车产业有限公司 | Machinery part surface processing method |
| CN106833250A (en) * | 2017-02-23 | 2017-06-13 | 广州梵竹水性涂料有限公司 | A kind of waterborne metal anti-corrosive paint and preparation method thereof |
-
2017
- 2017-07-12 CN CN201710563502.9A patent/CN107287554A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101422858A (en) * | 2007-11-02 | 2009-05-06 | 庞力 | Manufacture method of no-coating abrasion-proof anti-corrosive iron pan |
| CN105506542A (en) * | 2015-12-23 | 2016-04-20 | 四川全丰新材料科技有限公司 | New QPQ nitrocarburizing corrosion resistance process for iron casting surface |
| CN105525254A (en) * | 2015-12-23 | 2016-04-27 | 德阳瑞泰科技有限公司 | Quench-polish-quench (QPQ) salt bath composite processing technology of water hydraulic component |
| CN106498340A (en) * | 2016-11-11 | 2017-03-15 | 重庆动沃机车产业有限公司 | Machinery part surface processing method |
| CN106833250A (en) * | 2017-02-23 | 2017-06-13 | 广州梵竹水性涂料有限公司 | A kind of waterborne metal anti-corrosive paint and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107740034A (en) * | 2017-10-27 | 2018-02-27 | 湖州正德轻工机械有限公司 | A kind of surface of workpiece heat treatment method |
| CN114231891A (en) * | 2021-11-23 | 2022-03-25 | 煤炭科学研究总院 | Surface treatment process for coal mine machinery |
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Application publication date: 20171024 |