CN102660759A - Method for chroming by using trivalent chromium - Google Patents
Method for chroming by using trivalent chromium Download PDFInfo
- Publication number
- CN102660759A CN102660759A CN2012101873542A CN201210187354A CN102660759A CN 102660759 A CN102660759 A CN 102660759A CN 2012101873542 A CN2012101873542 A CN 2012101873542A CN 201210187354 A CN201210187354 A CN 201210187354A CN 102660759 A CN102660759 A CN 102660759A
- Authority
- CN
- China
- Prior art keywords
- trivalent chromium
- plating
- thioformamide
- bath
- chloride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000011651 chromium Substances 0.000 title claims abstract description 24
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007747 plating Methods 0.000 claims abstract description 32
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 20
- 238000000576 coating method Methods 0.000 claims abstract description 20
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 14
- BDAGIHXWWSANSR-UHFFFAOYSA-N Formic acid Chemical compound OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 14
- CYEBJEDOHLIWNP-UHFFFAOYSA-N methanethioamide Chemical compound NC=S CYEBJEDOHLIWNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009713 electroplating Methods 0.000 claims abstract description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004327 boric acid Substances 0.000 claims abstract description 7
- 239000004202 carbamide Substances 0.000 claims abstract description 7
- 235000019253 formic acid Nutrition 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- 229910021555 Chromium Chloride Inorganic materials 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- DPDMMXDBJGCCQC-UHFFFAOYSA-N [Na].[Cl] Chemical compound [Na].[Cl] DPDMMXDBJGCCQC-UHFFFAOYSA-N 0.000 claims description 6
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 claims description 6
- 239000012467 final product Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000005238 degreasing Methods 0.000 claims description 3
- 238000005868 electrolysis reaction Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 235000017550 sodium carbonate Nutrition 0.000 claims description 3
- 239000001488 sodium phosphate Substances 0.000 claims description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 150000002500 ions Chemical class 0.000 abstract description 3
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract 2
- 229960000359 chromic chloride Drugs 0.000 abstract 1
- LJAOOBNHPFKCDR-UHFFFAOYSA-K chromium(3+) trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Cr+3] LJAOOBNHPFKCDR-UHFFFAOYSA-K 0.000 abstract 1
- 239000011636 chromium(III) chloride Substances 0.000 abstract 1
- 235000007831 chromium(III) chloride Nutrition 0.000 abstract 1
- 238000005253 cladding Methods 0.000 abstract 1
- 230000008021 deposition Effects 0.000 abstract 1
- 239000003446 ligand Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000011780 sodium chloride Substances 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a method for chroming by using trivalent chromium. A plating liquid is prepared from the following raw materials: 125-120 g/L of chromic chloride, 110-130 g/L of urea, 25-30 g/L of ammonium chloride, 9-10 g/L of boric acid, 8.5-9.5 g/L of methanoic acid, 200ml/L of carbinol, 25-35 g/L of sodium chloride and 0.05-0.2 g/L of thioformamide. The method comprises the steps of: during electroplating, electrolyzing for 24 hours by adopting the plating liquid, regulating the pH value to be 1.65-1.75, cleaning a part to be electroplated, then feeding into a plating groove in the electrifying state at the temperature of 20-40 DEG C, keeping constant potential of -3.5V to ensure that a cladding material reaches a specified thickness, fishing out, and drying by hot air. The invention has the advantages that complex ions formed by trivalent chromium and a ligand are completely depolymerized by using the thioformamide, the plating liquid is stable, the deposition speed is high, the generation of hydroxyl polymers can be inhibited when the pH value raises, and an electroplated chrome coating is in a stainless steel ground color and has better corrosion resistance and abrasive resistance.
Description
Technical field
The present invention relates to chrome-plated process, especially relate to a kind of method of using trivalent chromium chrome plating.
Background technology
Chromium coating has good hardness, wear resistance, solidity to corrosion and decorative appearance; Be widely used in the extexine and the functional coating of protection-decorative coating system; In electroplating industry, occupy consequence, at present, chromium plating has become one of most widely used plating in the electroplating industry always.For a long time, chromium plating all is to use sexavalent chrome, because sexavalent chrome toxicity is big and can be carcinogenic, has caused people's extensive concern.National governments have also strengthened the legislation management, like the U.S. chromic emission standard are changed into 0. 01mg/L from 0. 05mg/L, and carry out since 1997; European Union began restriction and progressively eliminated chromic use through ROHS (European Union's noxious restriction) rules in 2003.European Union's " motor vehicle liquidation guide " requirement forbids corrosion-resistant coating, using sexavalent chrome from July 1st, 2007.Trivalent chromium plating is as most important, the most alternative chromic plating; In use characteristics or environment protection, all has unrivaled meliority than the sexavalent chrome plating; But what chloride system at present commonly used existed trivalent chromium and part formation in the plating bath cooperates ion more stable, is difficult to separate out at negative electrode, and causing has a large amount of hydrogen to separate out on cathode surface; PH rises rapidly near causing cathode surface, even surpasses 8.With this understanding, at the Cr of cathode surface
3+Will form new poly title complex or colloidalmaterial, it is fine and close, loose even come off and can't thicken to cause trivalent chromium chrome plating to exist the coating crystallization.
Summary of the invention
The object of the present invention is to provide a kind of method of using trivalent chromium chrome plating, this method bath stability, sedimentation velocity are fast, and coating is the stainless steel background color and has good solidity to corrosion and wear resistance.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
The method of use trivalent chromium chrome plating of the present invention comprises plating bath, and said plating bath is formulated according to following ratio and method by following raw material:
Raw material: chromium chloride 125-120g/L; Urea 110-130 g/L; Ammonium chloride 25-30 g/L; Boric acid 9-10 g/L; Formic acid 8.5-9.5 g/L; Methyl alcohol 200ml/L; Sodium-chlor 25-35 g/L; Thioformamide 0.05-0.2 g/L;
Preparation: in coating bath, add the zero(ppm) water of 60% volume, the chromium chloride that slow adding is measured according to the above ratio is stirred well to dissolving fully; Continue 85% of adding distil water to coating bath TV, add urea, boric acid and the ammonium chloride of measuring in proportion then, after stirring, add sodium-chlor, methyl alcohol, formic acid and thioformamide again, stir, again zero(ppm) water is added to operational volume; Get final product to 1.65-1.75 with hydrochloride adjusted solution pH value.
Use the method for trivalent chromium chrome plating, comprise the steps:
The first step, with the plating bath electrolysis for preparing in the aqueduct 24 hours, inspection pH value is 1.65-1.75, and was subsequent use;
In second step, the electroplated component are pressed following operation clean: electrochemical deoiling-de-ionized washing-electrochemical degreasing-de-ionized washing-weak etch-de-ionized washing;
The 3rd step, with the charged coating bath that is lowered to of component after cleaning, 20-40 ℃, keep permanent electromotive force-3.6V, make coating reach specific thickness;
The 4th step, to pull out electroplating good component, hot blast drying gets final product.
Wherein the solutions employed prescription is in the electrochemical degreasing operation: sodium phosphate 20-30g/L; Yellow soda ash 20-30 g/L; Sodium hydroxide 30-50 g/L; Water glass 3-5 g/L; Solution temperature is 60-80 ℃; The oil removing time is 3-5min.
Need to add sulfuric acid 100-150g/L, solution temperature 25-40 ℃, etch time 0.5-2min in the solution of wherein said weak etch operation.
The invention has the advantages that use that thioformamide makes that trivalent chromium and part form cooperate ion complete " depolymerization is joined "; Bath stability, sedimentation velocity are fast; And can when the pH value raises, suppress the generation of hydroxyl polymers, and electroplate good chromium layer and be the stainless steel background color, have good solidity to corrosion, wear resistance.
Following table is the comparison
of sexavalent chrome chromium plating and trivalent chromium chrome plating method of the present invention.
Embodiment
The method of use trivalent chromium chrome plating of the present invention comprises the steps:
The first step, the preparation plating bath:
Raw material: chromium chloride 125-120g/L; Urea 110-130 g/L; Ammonium chloride 25-30 g/L; Boric acid 9-10 g/L; Formic acid 8.5-9.5 g/L; Methyl alcohol 200ml/L; Sodium-chlor 25-35 g/L; Thioformamide 0.05-0.2 g/L;
Preparation: in the coating bath that cleans up, add the zero(ppm) water of 60% volume, the chromium chloride that slow adding is measured according to the above ratio is stirred well to dissolving fully; Continue 85% of adding distil water to coating bath TV, add urea, boric acid and the ammonium chloride of measuring in proportion then, after stirring, add sodium-chlor, methyl alcohol, formic acid and thioformamide again, stir, again zero(ppm) water is added to operational volume; Use the accurate digital display acidometer of PSH-2C, to 1.65-1.75, stir fast in the adjustment process with salt slow acid adjustment pH value of solution value; After preparation is accomplished, with 1A/dm
2Current density electrolysis 24 hours, re-use digital display acidometer inspection pH value, meet after the 1.65-1.75 scope subsequent use;
In second step, the electroplated component are pressed following operation clean: electrochemical deoiling-de-ionized washing-electrochemical degreasing-de-ionized washing-weak etch-de-ionized washing;
Wherein, during electrochemical deoiling, use 180# to clean gasoline the component greasy dirt is cleaned, handles;
During electrochemical degreasing, the prescription of used solution is: sodium phosphate 20-30g/L; Yellow soda ash 20-30 g/L; Sodium hydroxide 30-50 g/L; Water glass 3-5 g/L; Solution temperature is 60-80 ℃; The oil removing time is 3-5min;
During weak etch, need to add sulfuric acid 100-150g/L, solution temperature 25-40 ℃, etch time 0.5-2min in the solution;
The 3rd step; With the charged coating bath that is lowered to of component after cleaning; Graphite anode, keeps permanent electromotive force-3.6V (general sustainable 5-8 minute) by bath temperature 20-40 ℃; Make coating reach 20-30 micron thickness (concrete thickness and electroplating time are linear, can adjust according to the specific thickness of coating); In the electroplating process, use the activated carbon filtration machine that plating bath is circulated and filter, per hour filter 1-2 time, can contaminant removals such as the iron ion that endangers the tank liquor quality, cupric ion be gone out;
The 4th step, to pull out electroplating good component, 60-80 ℃ of hot blast drying component get final product.
Claims (4)
1. a method of using trivalent chromium chrome plating comprises plating bath, it is characterized in that: said plating bath is formulated according to following ratio and method by following raw material:
Raw material: chromium chloride 125-120g/L; Urea 110-130 g/L; Ammonium chloride 25-30 g/L; Boric acid 9-10 g/L; Formic acid 8.5-9.5 g/L; Methyl alcohol 200ml/L; Sodium-chlor 25-35 g/L; Thioformamide 0.05-0.2 g/L;
Preparation: in coating bath, add the zero(ppm) water of 60% volume, the chromium chloride that slow adding is measured according to the above ratio is stirred well to dissolving fully; Continue 85% of adding distil water to coating bath TV, add urea, boric acid and the ammonium chloride of measuring in proportion then, after stirring, add sodium-chlor, methyl alcohol, formic acid and thioformamide again, stir, again zero(ppm) water is added to operational volume; Get final product to 1.65-1.75 with hydrochloride adjusted solution pH value.
2. the method for use trivalent chromium chrome plating according to claim 1 is characterized in that: it comprises the steps:
The first step, with the plating bath electrolysis for preparing in the aqueduct 24 hours, inspection pH value is 1.65-1.75, and was subsequent use;
In second step, the electroplated component are pressed following operation clean: electrochemical deoiling-de-ionized washing-electrochemical degreasing-de-ionized washing-weak etch-de-ionized washing;
The 3rd step, with the charged coating bath that is lowered to of component after cleaning, 20-40 ℃, keep permanent electromotive force-3.6V, make coating reach specific thickness;
The 4th step, to pull out electroplating good component, hot blast drying gets final product.
3. the method for use trivalent chromium chrome plating according to claim 2 is characterized in that: the solutions employed prescription is in the electrochemical degreasing operation: sodium phosphate 20-30g/L; Yellow soda ash 20-30 g/L; Sodium hydroxide 30-50 g/L; Water glass 3-5 g/L; Solution temperature is 60-80 ℃; The oil removing time is 3-5min.
4. the method for use trivalent chromium chrome plating according to claim 2 is characterized in that: need to add sulfuric acid 100-150g/L, solution temperature 25-40 ℃, etch time 0.5-2min in the solution of said weak etch operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101873542A CN102660759A (en) | 2012-06-08 | 2012-06-08 | Method for chroming by using trivalent chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101873542A CN102660759A (en) | 2012-06-08 | 2012-06-08 | Method for chroming by using trivalent chromium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102660759A true CN102660759A (en) | 2012-09-12 |
Family
ID=46770333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101873542A Pending CN102660759A (en) | 2012-06-08 | 2012-06-08 | Method for chroming by using trivalent chromium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102660759A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388989A (en) * | 2014-11-14 | 2015-03-04 | 无锡信大气象传感网科技有限公司 | Trivalent chromium electroplating liquid and preparation method thereof |
| CN105696028A (en) * | 2014-11-28 | 2016-06-22 | 中国科学院金属研究所 | Trivalent chromium electroplating solution and electroplating method |
| EP3147388A1 (en) * | 2015-09-25 | 2017-03-29 | Enthone, Incorporated | Flexible color adjustment for dark cr(iii)-platings |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3699013A (en) * | 1969-08-26 | 1972-10-17 | Nippon Kokan Kk | Method of electroplating readily oxidizable metals |
| US5413646A (en) * | 1991-02-08 | 1995-05-09 | Blount, Inc. | Heat-treatable chromium |
| CN101078132A (en) * | 2006-05-26 | 2007-11-28 | 中国科学院兰州化学物理研究所 | Method for electrodepositing wearable thick chromium coating in trivalency chromium coating solution |
| CN101078131A (en) * | 2006-05-26 | 2007-11-28 | 中国科学院兰州化学物理研究所 | Method for electrodepositing ornamental chromium coating in trivalency chromium coating solution |
| CN101665959A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院宁波材料技术与工程研究所 | Trivalent chromium electroplating solution of sulfate system and electroplating method thereof |
| CN101748449A (en) * | 2010-01-19 | 2010-06-23 | 上海应用技术学院 | Method for plating chromium by using trivalent chromium |
-
2012
- 2012-06-08 CN CN2012101873542A patent/CN102660759A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3699013A (en) * | 1969-08-26 | 1972-10-17 | Nippon Kokan Kk | Method of electroplating readily oxidizable metals |
| US5413646A (en) * | 1991-02-08 | 1995-05-09 | Blount, Inc. | Heat-treatable chromium |
| CN101078132A (en) * | 2006-05-26 | 2007-11-28 | 中国科学院兰州化学物理研究所 | Method for electrodepositing wearable thick chromium coating in trivalency chromium coating solution |
| CN101078131A (en) * | 2006-05-26 | 2007-11-28 | 中国科学院兰州化学物理研究所 | Method for electrodepositing ornamental chromium coating in trivalency chromium coating solution |
| CN101665959A (en) * | 2008-09-03 | 2010-03-10 | 中国科学院宁波材料技术与工程研究所 | Trivalent chromium electroplating solution of sulfate system and electroplating method thereof |
| CN101748449A (en) * | 2010-01-19 | 2010-06-23 | 上海应用技术学院 | Method for plating chromium by using trivalent chromium |
Non-Patent Citations (6)
| Title |
|---|
| 张立茗 等: "《实用电镀添加剂》", 31 January 2007, 化学工业出版社 * |
| 李永彦 等: "三价铬硫酸盐电镀铬的发展现状", 《电镀与精饰》 * |
| 沈品华: "电镀铬新工艺", 《腐蚀与防护》 * |
| 潘继民: "《电镀技术1000问》", 31 January 2011, 机械工业出版社 * |
| 王建平: "《实用磷化及相关技术》", 31 March 2009, 机械工业出版社 * |
| 王玉琴: "甲酸-甲醇-尿素体系三价铬镀铬工艺的研究", 《电镀与环保》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104388989A (en) * | 2014-11-14 | 2015-03-04 | 无锡信大气象传感网科技有限公司 | Trivalent chromium electroplating liquid and preparation method thereof |
| CN105696028A (en) * | 2014-11-28 | 2016-06-22 | 中国科学院金属研究所 | Trivalent chromium electroplating solution and electroplating method |
| EP3147388A1 (en) * | 2015-09-25 | 2017-03-29 | Enthone, Incorporated | Flexible color adjustment for dark cr(iii)-platings |
| KR20180066052A (en) * | 2015-09-25 | 2018-06-18 | 맥더미드 엔쏜 인코포레이티드 | Flexible color adjustment for dark chrome (III) plating |
| CN108290382A (en) * | 2015-09-25 | 2018-07-17 | 麦克德米德乐思公司 | The flexible color of dark-coloured Cr (III) plating adjusts |
| JP2018528327A (en) * | 2015-09-25 | 2018-09-27 | マクダーミッド エンソン インコーポレイテッド | Flexible color adjustment for dark Cr (III) plating |
| US10544516B2 (en) * | 2015-09-25 | 2020-01-28 | Macdermid Enthone Inc. | Flexible color adjustment for dark Cr(III) platings |
| KR102188898B1 (en) * | 2015-09-25 | 2020-12-09 | 맥더미드 엔쏜 인코포레이티드 | Flexible color adjustment for dark chrome(III) plating |
| US10988854B2 (en) | 2015-09-25 | 2021-04-27 | Macdermid Enthone Inc. | Flexible color adjustment for dark Cr(III) platings |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106245071B (en) | Acid non-cyanide plating cadmium additive, plating solution prepares and electroplating technology | |
| CN101876071B (en) | Environmentally-friendly black chrome-silver-free zinc-plating passivation solution and preparation method thereof | |
| CN102352521B (en) | Environment-friendly barrel-plating type trivalent chromium plating solution and barrel-plating method thereof | |
| CN1880512A (en) | Trivalent chromium electroplating solution in sulfate system and method for preparing same | |
| CN102443825B (en) | High-concentration chromium sulfate-ammonium fluoride trivalent chromium electroplating solution and preparation method thereof | |
| WO2014157105A1 (en) | Zinc-nickel alloy plating solution and plating method | |
| CN102660759A (en) | Method for chroming by using trivalent chromium | |
| CN106086956B (en) | Alkaline non-cyanide electrodepositing zinc-nickel alloy additive and its application | |
| CN110512240A (en) | A kind of white chromium electrodeposit liquid of salt acid type highly corrosion resistant trivalent | |
| US4432843A (en) | Trivalent chromium electroplating baths and processes using thiazole addition agents | |
| Zeng et al. | A review of recent patents on trivalent chromium plating | |
| CN105780070B (en) | A kind of Electrodeposition of Zn-ni Alloy In Alkaline Bath technique and its series additive | |
| CN102383149B (en) | Environment-friendly trivalent chromium electroplating solution and environment-friendly trivalent chromium electroplating method | |
| CN103866372A (en) | Electrochemical coloring solution for stainless steel and coloring method | |
| CA1222720A (en) | Zinc cobalt alloy plating | |
| CN104911645A (en) | Alkaline cyanide-free zinc plating agent and application method thereof | |
| CN101565843B (en) | A kind of preparation method of zinc-magnesium alloy coating | |
| Biddulph | Zinc electroplating | |
| CN105461117A (en) | Recovery and comprehensive utilization process for electroplating wastewater | |
| CN105239111A (en) | Trivalent chromium electroplate liquid and preparing method thereof | |
| CN106245068A (en) | A kind of guard electric chrome solution and electrodeposited chromium method thereof | |
| CN103668347A (en) | Environment-friendly trivalent chromium electroplating method | |
| CN106167908A (en) | A kind of grill electric chrome solution and electrodeposited chromium method thereof | |
| CN105297084B (en) | A kind of cold-reduced sheet trivalent chromium plating method | |
| KR100419655B1 (en) | A METHOD FOR MANUFACTURING Zn-Ni ALLOY ELECTRODEPOSITION STEEL SHEET BY USING Zn-Ni ALLOY ELECTRODEPOSITION SOLUTION |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120912 |