CN102660759A - Method for chroming by using trivalent chromium - Google Patents
Method for chroming by using trivalent chromium Download PDFInfo
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- 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
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- trivalent chromium
- plating
- thioformamide
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- chloride
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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.
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| CN2012101873542A CN102660759A (en) | 2012-06-08 | 2012-06-08 | Method for chroming by using trivalent chromium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101873542A CN102660759A (en) | 2012-06-08 | 2012-06-08 | Method for chroming by using trivalent chromium |
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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 |
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2012
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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 |
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Application publication date: 20120912 |