CN101935833A - Stainless steel blackening agent and blackening method - Google Patents
Stainless steel blackening agent and blackening method Download PDFInfo
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- CN101935833A CN101935833A CN2009101084501A CN200910108450A CN101935833A CN 101935833 A CN101935833 A CN 101935833A CN 2009101084501 A CN2009101084501 A CN 2009101084501A CN 200910108450 A CN200910108450 A CN 200910108450A CN 101935833 A CN101935833 A CN 101935833A
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- stainless steel
- blackening
- sodium
- blackening agent
- agent
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 95
- 239000010935 stainless steel Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 42
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 235000010344 sodium nitrate Nutrition 0.000 claims abstract description 14
- 239000004317 sodium nitrate Substances 0.000 claims abstract description 14
- 239000007864 aqueous solution Substances 0.000 claims abstract description 4
- 230000003647 oxidation Effects 0.000 claims description 24
- 238000007254 oxidation reaction Methods 0.000 claims description 24
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 14
- JXAZAUKOWVKTLO-UHFFFAOYSA-L sodium pyrosulfate Chemical compound [Na+].[Na+].[O-]S(=O)(=O)OS([O-])(=O)=O JXAZAUKOWVKTLO-UHFFFAOYSA-L 0.000 claims description 13
- 229940045641 monobasic sodium phosphate Drugs 0.000 claims description 12
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 12
- 229940001516 sodium nitrate Drugs 0.000 claims description 12
- 239000011973 solid acid Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 8
- 235000010265 sodium sulphite Nutrition 0.000 claims description 7
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 235000019800 disodium phosphate Nutrition 0.000 claims description 3
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 abstract description 11
- 229910021641 deionized water Inorganic materials 0.000 abstract description 11
- 239000000126 substance Substances 0.000 abstract description 3
- 239000011684 sodium molybdate Substances 0.000 abstract 2
- 235000015393 sodium molybdate Nutrition 0.000 abstract 2
- 235000011121 sodium hydroxide Nutrition 0.000 abstract 1
- 238000004381 surface treatment Methods 0.000 abstract 1
- 239000002932 luster Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 238000005238 degreasing Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention belongs to the technical field of surface treatment and relates to a stainless steel blackening agent, which contains aqueous solution which is formed by dissolving sodium hydroxide, sodium nitrate and sodium molybdate in deionized water, the content of the sodium hydroxide is 400-540g/L, the content of the sodium nitrate is 28.5-114g/L, and the content of the sodium molybdate is 5.7-57g/L. The invention also provides a blackening method for stainless steel, which comprises the following step: a stainless steel work piece is put into the stainless steel blackening agent to be oxidized and blackened, and the stainless steel blackening agent is the stainless steel blackening agent in any of claims 1-4. The stainless steel blackening agent and the blackening method are applicable to the fields of electronic industry, kitchen utensils, household appliances, instruments and meters, automotive industry, chemical equipment and the like.
Description
Technical field
The present invention relates to a kind of stainless steel blackening agent for surface and blackening method.
Background technology
The black stainless steel is widely used in building and decoration material field.Along with improving constantly of people's demand, industries such as electronic industry, kitchen utensils, household electrical appliance, instrument, automotive industry, chemical industry equipment, sign printing and aerospace military project can not be satisfied with use primary colors stainless steel, also bring into use the black stainless steel.Therefore the stainless steel oxidation blackout begins to be subject to people's attention as a kind of stainless steel coloring technology.
Prior art potassium bichromate commonly used and sulfuric acid are as stainless blackening agent for surface, and this blackening agent for surface contains potassium bichromate, and contaminate environment is inhomogeneous with the stainless rete color and luster that this blackening agent for surface obtains simultaneously, defective such as general coloured silk arranged.
Summary of the invention
The technical problem to be solved in the present invention is existing stainless steel blackening agent for surface contaminate environment, the defective that the stainless steel rete color and luster degree that obtains after the blackout is inhomogeneous, have general coloured silk, thereby provide a kind of environmentally friendly, even, the bright stainless steel blackening agent for surface of stainless steel rete color and luster degree that obtains after the blackout.
The invention provides a kind of stainless steel blackening agent for surface, comprise that sodium hydroxide, SODIUMNITRATE and Sodium orthomolybdate are dissolved in the aqueous solution that deionized water forms, the content of described sodium hydroxide is 400-540g/L, and the content of described SODIUMNITRATE is 28.5-114g/L, and the content of described Sodium orthomolybdate is 5.7-57g/L.
Simultaneously in order to solve the defective that the stainless steel rete color and luster degree that obtains after the stainless steel blackout is inhomogeneous, general coloured silk is arranged, thereby provide a kind of even, bright stainless steel blackening method of stainless steel rete color and luster degree that can make blackout.
A kind of stainless steel blackening method wherein, comprises stainless steel work-piece is placed the stainless steel blackening agent for surface, carries out the oxidation blackout, and described stainless steel blackening agent for surface is a stainless steel blackening agent for surface of the present invention.
With blackening agent for surface provided by the invention and blackening method stainless steel is turned black, the rete that obtains is pitch-black, and evenly glossiness is good, and is ornamental strong, is suitable for fields such as electronic industry, kitchen utensils, household electrical appliance, instrument, automotive industry, chemical industry equipment.
Description of drawings
The photo of the stainless steel work-piece that Fig. 1 embodiment 5 obtains;
The photo of the stainless steel work-piece that Fig. 2 Comparative Examples 1 obtains.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, below the present invention is further elaborated.
The invention provides a kind of stainless steel blackening agent for surface, comprise that sodium hydroxide, SODIUMNITRATE and Sodium orthomolybdate are dissolved in the aqueous solution that deionized water forms, the content of described sodium hydroxide is 400-540g/L, and the content of described SODIUMNITRATE is 28.5-114g/L, and the content of described Sodium orthomolybdate is 5.7-57g/L.In order to make film forming speed fast, film-formation result is good, and in the preferred case, the content of described sodium hydroxide is 460-510g/L, and the content of described SODIUMNITRATE is 40-100g/L, and the content of described Sodium orthomolybdate is 6-15g/L.
According to stainless steel blackening agent for surface provided by the invention, in the preferred case, described stainless steel blackening agent for surface also comprises SODIUM PHOSPHATE, MONOBASIC, and the content of described SODIUM PHOSPHATE, MONOBASIC is 5.7-57g/L.Described SODIUM PHOSPHATE, MONOBASIC is buffer reagent and secondary film formers, adds sticking power and wear resistance that SODIUM PHOSPHATE, MONOBASIC can improve rete.
According to stainless steel blackening agent for surface provided by the invention, in the preferred case, described stainless steel blackening agent for surface also comprises sodium sulphite, and the content of described sodium sulphite is 30-45g/L.Adopt the sulfurized method can improve the anti-scouring performance of rete.
According to stainless steel blackening agent for surface provided by the invention, in the preferred case, described stainless steel blackening agent for surface also comprises sim alkylphenol Soxylat A 25-7 (OP-10), and the content of described sim alkylphenol Soxylat A 25-7 is 6-25g/L.Described sim alkylphenol Soxylat A 25-7 is an emulsifying agent, for film forming provides certain help.
The present invention also provides a kind of stainless steel blackening method to comprise stainless steel work-piece is placed the stainless steel blackening agent for surface, carries out the oxidation blackout, and described stainless steel blackening agent for surface is a stainless steel blackening agent for surface of the present invention.
More even for the superficial film color and luster degree that makes the stainless steel work-piece after the blackout, before stainless steel work-piece being carried out the oxidation blackout, also stainless steel work-piece to be activated in activation solution.Described activation solution is a solid acid.Adopting solid acid is wear resistance and the adhesion performance that activation solution can improve the rete of the stainless steel surface after the blackout.
Described solid acid is various solid acids, be preferably in sodium pyrosulfate, sal enixum, Sodium phosphate dibasic, the SODIUM PHOSPHATE, MONOBASIC one or more in the present invention, the concentration of described solid acid is 200-300g/L, embodiments of the invention are that example is illustrated with the sodium pyrosulfate, and the effect and the sodium pyrosulfate of described sal enixum, Sodium phosphate dibasic and SODIUM PHOSPHATE, MONOBASIC are similar.
According to stainless steel blackening method of the present invention, in the preferred case, the temperature of described oxidation blackout is 120-127 ℃, and the time is 5-10min.Blackout time and black film effect in this scope are all more satisfactory.
According to stainless steel blackening method of the present invention, in the preferred case, before being activated, stainless steel work-piece also to carry out oil removing, the method of described oil removing is a technology known in those skilled in the art, as with stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 3-5min to remove the greasy dirt on surface.
After above-mentioned each step, stainless steel blackening method of the present invention can also comprise washing and exsiccant step, to remove the residual solution of stainless steel surface; The used water of described water-washing step is various water of the prior art, as deionized water, distilled water, pure water or their mixture, is preferably deionized water.Can adopt the method for well known to a person skilled in the art to carry out drying, for example forced air drying, natural air drying or oven dry under 40-100 ℃.
To be described in more detail the present invention by having embodiment below.
Embodiment 1
Present embodiment is used to illustrate the preparation and the blackening method of blackening agent for surface of the present invention.
1, blackening agent for surface preparation
Take by weighing 480g sodium hydroxide, 70g SODIUMNITRATE and 10g Sodium orthomolybdate respectively and be dissolved in the 500mL deionized water, and stir, add entry again, promptly obtain the blackening agent for surface of present embodiment to 1L.
2, blackening method
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in solid acid (sodium pyrosulfate) activation solution, the concentration of activation solution is 250g/L, carry out the oxidation blackout in the blackening agent for surface that stainless steel work-piece after will activating then prepares in 1, the temperature of oxidation blackout is 125 ℃, and the oxidation blackout time is 8min.At last workpiece is washed the stainless steel work-piece A1 that dries up after remembering to turn black.
Embodiment 2
1, the preparation of blackening agent for surface
Take by weighing 450g sodium hydroxide, 75g SODIUMNITRATE, 8g Sodium orthomolybdate and 28g SODIUM PHOSPHATE, MONOBASIC respectively and be dissolved in the 500mL deionized water, and stir, add deionized water again, promptly obtain the blackening agent for surface of present embodiment to 1L.
2, blackening method
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in sodium pyrosulfate, and the concentration of sodium pyrosulfate is 270g/L, carries out the oxidation blackout then in the blackening agent for surface that stainless steel work-piece is prepared in 1, and the temperature that oxidation is sent out is 125 ℃, and the time of oxidation blackout is 8min.At last workpiece is washed the stainless steel work-piece A2 that dries up after remembering to turn black.
Embodiment 3
1, the preparation of blackening agent for surface
Take by weighing 450g sodium hydroxide, 75g SODIUMNITRATE, 8g Sodium orthomolybdate, 28g SODIUM PHOSPHATE, MONOBASIC and 40g sodium sulphite respectively and be dissolved in the 500mL deionized water, and stir, add deionized water again, promptly obtain the blackening agent for surface of present embodiment to 1L.
2, blackening method
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 3-5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in sodium pyrosulfate, and the concentration of sodium pyrosulfate is 200g/L, carries out the oxidation blackout then in the blackening agent for surface that stainless steel work-piece is prepared in 1, and the temperature of oxidation blackout is 125 ℃, and the oxidation blackout time is 8min.At last workpiece is washed the stainless steel work-piece A3 that dries up after remembering to turn black.
Embodiment 4
1, the preparation of blackening agent for surface
Taking by weighing 450g sodium hydroxide, 75g SODIUMNITRATE, 8g Sodium orthomolybdate, 28g SODIUM PHOSPHATE, MONOBASIC, 40g sodium sulphite and 15g sim alkylphenol Soxylat A 25-7 respectively is dissolved in the 500mL deionized water, and stir, add deionized water again to 1L, promptly obtain the blackening agent for surface of present embodiment.
2, blackening method
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in sodium pyrosulfate, and the concentration of sodium pyrosulfate is 300g/L, carries out the oxidation blackout then in the blackening agent for surface that stainless steel work-piece is prepared in 1, and the temperature of oxidation blackout is 125 ℃, and the oxidation blackout time is 8min.At last workpiece is washed the stainless steel work-piece A4 that dries up after remembering to turn black.
Embodiment 5
1, the preparation of blackening agent for surface:
Take by weighing 450g sodium hydroxide, 75g SODIUMNITRATE, 8g Sodium orthomolybdate, 40g sodium sulphite and 15g sim alkylphenol Soxylat A 25-7 respectively and be dissolved in 500mL water in beaker, and stir, add deionized water again, promptly obtain the blackening agent for surface of present embodiment to 1L.
2, blackening method
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 3-5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in sodium pyrosulfate, and the concentration of sodium pyrosulfate is 270g/L, carries out the oxidation blackout then in the blackening agent for surface that stainless steel work-piece is prepared in 1, and the temperature of oxidation blackout is under 125 ℃, and the oxidation blackout time is 8min.At last workpiece is washed and is dried up the stainless steel work-piece A5 that remembers after the blackout, as Fig. 1, stainless steel work-piece A5 surface color is black, metalluster is arranged, glossiness evenly, do not have a general coloured silk.
Comparative Examples 1
With stainless steel work-piece respectively JSD-all can degreasing fluid (clean scholar reaches) and JSD-acid deoiling liquid (clean scholar reaches) in soak each 3-5min to remove the greasy dirt on surface; Stainless steel work-piece after the oil removing is activated in the solid acid activation solution, then workpiece is placed the mixing solutions of the potassium bichromate of 355g/L and the sulfuric acid of 350g/L (d=1.84), under 110 ℃ of conditions, carry out the oxidation blackout.At last workpiece is washed and dried up, the stainless steel work-piece B1 after obtaining turning black, as Fig. 2, the surface color black of stainless steel work-piece B1 is more shallow, the color and luster degree is even inadequately, general color phenomenon is arranged.
Testing method
Use visual observations, test result sees Table 1.
Table 1
| Product | Surface effect |
| A1 | Black, glossiness is even, does not have general coloured silk |
| A2 | Black has metalluster, and glossiness is even, does not have general coloured silk |
| A3 | Black has metalluster, and glossiness is even, does not have general coloured silk |
| A4 | Corvinus has metalluster, and glossiness is even, does not have general coloured silk |
| A5 | Black has metalluster, and glossiness is even, does not have general coloured silk |
| B1 | Black is more shallow, and the color and luster degree is even inadequately, and general color phenomenon is arranged |
From table 1 and Fig. 1, can draw, the product surface glossiness that obtains with blackening agent for surface of the present invention and blackening method evenly, do not have a general color phenomenon; As can be seen from Figure 2, inhomogeneous, the general color phenomenon of product surface glossiness that obtains with existing blackening agent for surface is serious.
Claims (10)
1. stainless steel blackening agent for surface, it is characterized in that comprise that sodium hydroxide, SODIUMNITRATE and Sodium orthomolybdate are dissolved in the aqueous solution that deionized water forms, the content of described sodium hydroxide is 400-540g/L, the content of described SODIUMNITRATE is 28.5-114g/L, and the content of described Sodium orthomolybdate is 5.7-57g/L.
2. stainless steel blackening agent for surface according to claim 1 also comprises SODIUM PHOSPHATE, MONOBASIC, and the content of described SODIUM PHOSPHATE, MONOBASIC is 5.7-57g/L.
3. stainless steel blackening agent for surface according to claim 1 and 2 also comprises sodium sulphite, and the content of described sodium sulphite is 28.5-45.6g/L.
4. stainless steel blackening agent for surface according to claim 3 also comprises the sim alkylphenol Soxylat A 25-7, and the content of described sim alkylphenol Soxylat A 25-7 is 5.7-27g/L.
5. a stainless steel blackening method is characterized in that, comprises stainless steel work-piece is placed the stainless steel blackening agent for surface, carries out the oxidation blackout, and described stainless steel blackening agent for surface is any described stainless steel blackening agent for surface of claim 1-4.
6. stainless steel blackening method according to claim 5 also will activate stainless steel work-piece before stainless steel work-piece being carried out the oxidation blackout in activation solution.
7. stainless steel blackening method according to claim 6, wherein, described activation solution is a solid acid.
8. stainless steel blackening method according to claim 7, the concentration of described solid acid are 200-300g/L.
9. stainless steel blackening method according to claim 5, described solid acid are sodium pyrosulfate, sal enixum, Sodium phosphate dibasic, SODIUM PHOSPHATE, MONOBASIC.
10. stainless steel blackening method according to claim 5, wherein, the temperature of oxidation blackout is 115-127 ℃, the time is 2min-15min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910108450A CN101935833B (en) | 2009-06-30 | 2009-06-30 | Stainless steel blackening agent and blackening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910108450A CN101935833B (en) | 2009-06-30 | 2009-06-30 | Stainless steel blackening agent and blackening method |
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| Publication Number | Publication Date |
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| CN101935833A true CN101935833A (en) | 2011-01-05 |
| CN101935833B CN101935833B (en) | 2012-09-05 |
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| CN200910108450A Withdrawn - After Issue CN101935833B (en) | 2009-06-30 | 2009-06-30 | Stainless steel blackening agent and blackening method |
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Cited By (9)
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| CN102965652A (en) * | 2012-11-07 | 2013-03-13 | 浙江博海金属制品科技有限公司 | Stainless steel plate surface blackening treatment process |
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
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| CN110042378A (en) * | 2019-03-27 | 2019-07-23 | 祝亚琴 | Stainless steel blackening agent for surface |
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| CN102965652A (en) * | 2012-11-07 | 2013-03-13 | 浙江博海金属制品科技有限公司 | Stainless steel plate surface blackening treatment process |
| CN102965652B (en) * | 2012-11-07 | 2014-11-05 | 浙江博海金属制品科技有限公司 | Stainless steel plate surface blackening treatment process |
| CN104233275A (en) * | 2014-09-23 | 2014-12-24 | 中山市华光化工有限公司 | High-temperature blackening agent suitable for stainless steel or alloy steel and using method of high-temperature blackening agent |
| CN107287585A (en) * | 2016-03-31 | 2017-10-24 | 深圳市志邦科技有限公司 | A kind of environmentally friendly Bluing in Normal Temperature method of steel |
| CN109312470A (en) * | 2016-06-23 | 2019-02-05 | 伊西康公司 | The technique of quick blackening for acus |
| US11542607B2 (en) | 2016-06-23 | 2023-01-03 | Ethicon, Inc. | Process for the rapid blackening of surgical needles |
| CN107352570A (en) * | 2017-08-10 | 2017-11-17 | 青阳县永诚钙业有限责任公司 | A kind of preparation method of stratiform calcite calcium carbonate |
| CN110042383A (en) * | 2019-03-27 | 2019-07-23 | 祝亚琴 | High temperature aluminium blackening agent for surface |
| CN110042378A (en) * | 2019-03-27 | 2019-07-23 | 祝亚琴 | Stainless steel blackening agent for surface |
| CN112071946A (en) * | 2019-05-21 | 2020-12-11 | 北京铂阳顶荣光伏科技有限公司 | Preparation method of thin-film solar cell |
| CN113667970A (en) * | 2020-05-03 | 2021-11-19 | 江西金力永磁科技股份有限公司 | Surface passivation treatment method for neodymium iron boron magnetic steel |
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| Publication number | Publication date |
|---|---|
| CN101935833B (en) | 2012-09-05 |
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