CN102634825A - Method for plating hard chromium in trivalent chromium bath for forming thick plated layer - Google Patents
Method for plating hard chromium in trivalent chromium bath for forming thick plated layer Download PDFInfo
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- CN102634825A CN102634825A CN201210142885XA CN201210142885A CN102634825A CN 102634825 A CN102634825 A CN 102634825A CN 201210142885X A CN201210142885X A CN 201210142885XA CN 201210142885 A CN201210142885 A CN 201210142885A CN 102634825 A CN102634825 A CN 102634825A
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Abstract
The invention relates to a method for plating hard chromium in trivalent chromium bath for forming a thick plated layer. The present problem that the thick plated layer cannot be formed on the surface of a workpiece by taking a sexivalent chromium salt as electroplating solution is solved. The technological conditions for electroplating chromium are as follows: adding a defined amount of BSG12 type trivalent chromium electroplating solution into a plating tank according to the size of the workpiece, wherein the electroplating solution meets the demands on: temperature at 15-35 DEG C, current density of 15-45 A/dm2 and PH value of 1.5-2.2; adjusting by using dilute sulphuric acid or sodium carbonate; taking a DSA anode as anode; keeping a distance between cathode and anode within a range of 35mm to 45mm; while electroplating, keeping volume current density less than or equal to 9.8A/L; when electroplating work load reaches 30AH/L, supplementing 50ml/L BSG12 type trivalent chromium electroplating solution; repeatedly filtering tank solution at regular intervals; when potassium sulfate in the solution exceeds 200g/L, reducing the temperature of solution to below 2 DEG C; and after filtering the dissolved potassium sulfate, adjusting the PH value of the solution to be 1.5-2.2 by using the dilute sulphuric acid or sodium carbonate, and keeping working. According to the method provided by the invention, a thick chromium-plated layer which is continuous, compact, complete and excellently jointed with substrate metal is obtained on the steel workpiece; the thickness of the chromium-plated layer can reach 40 microns; and the microhardness HV is more than or equal to 850.
Description
Technical field:
The present invention relates to a kind of trivalent chromium hard chrome plating method, particularly a kind of chrome-plating method that can form thickness coating, and can on the chromed hardened driving member of traditional sexavalence, obtain functional wear resistance applications coating.
Background technology:
At present, use the staple of sexavalence chromic salts in the electro-plating method of thickness coating (thickness of coating is above 20 microns) hard chrome plating (microhardness HV is greater than 850) usually as electroplate liquid.Adopt the electro-plating method of sexavalence chromic salts as the staple of electroplate liquid, used chromic salts is chromium trioxide (chromic anhydride CrO
3), this electro-plating method can obtain continuous, fine and close thick chromium coating at piece surface.This method current efficiency low (20%), electroplating process need heating, have chromic heavy metal pollution problem in the three waste discharge.Sexavalent chrome is handled without special environmental protection treatment measure; Can not form nontoxic material naturally; In natural water body and soil, can be formed with active source of pollution for a long time, be carcinogenic, the clastogenic material that international medical community is confirmed, is the important control ion of heavy metal contamination.The plating chromic salts that trivalent chromium hard chrome plating method is used is a chromic salt, and the current efficiency (40%) of chromic salt in electroplating process is higher than the electro-plating method of sexavalence chromic salts as the staple of electroplate liquid, and electroplating process does not need heating, save energy; Waste liquid that chromic salt emits in process of production through in the alkali lye with the insolubles filtering-depositing that forms alkaline chromic salt after, natural water and soil are safe from harm basically and pollute, its toxicity is well below sexavalent chrome.
The method of comprehensive above-mentioned two kinds of electrodeposited chromiums can find out that the sexavalence chromic salts is serious heavy metal environmental pollution improvement problem as the weak point of the electrodeposited chromium method existence of the staple of electroplate liquid.The problem that trivalent chromium hard chrome plating technology exists is to form thick chromium coating, is generally used for ornamental thin chromium coating.
Summary of the invention:
The used chromium plating solution of the present invention is to improve on main salt, the galvanic anode material selection with trivalent chromium, has solved present sexavalence chromic salts and can not form deep-chromed problem at workpiece surface as electroplate liquid.
Adopt BSG12 type trivalent chromium plating liquid (commodity that Peking blue Li Jiamei chemical science and technology center produces) for electroplating working fluid; The metallic titanium plate that forms top coat through solution impregnation and the sintering processes that contains iridium, tantalum is as electroplating the DSA anode; Adopt the direct current electrode position power supply, iron and steel parts is electroplated under normal temperature condition through conventional oil removing and activation treatment; The significant parameter of control electroplating process; On iron and steel parts, obtain continuous, fine and close, complete, combine good thick chromium coating with matrix metal, chromium coating thickness reaches 40 microns, microhardness (HV >=850).
The present invention realizes through following technical scheme:
A kind of trivalent chromium hard chrome plating method that can form thickness coating, concrete grammar is following:
Iron and steel parts process electrochemical deoiling, water rinse, the Hydrogen chloride activation, water rinse, zero(ppm) water cleans, and dress is hung workpiece, and electrodeposited chromium goes out the groove washing, drying;
The electrodeposited chromium processing condition are following:
Add in the coating bath according to an amount of BSG12 type of the big young pathbreaker of workpiece trivalent chromium plating working fluid, the electroplate liquid condition should meet:
Temperature: 15～35 ℃
Current density: 15～45A/dm
2
PH value: 1.5～2.2, regulate with dilute sulphuric acid or yellow soda ash;
Anode adopts the DSA anode, and promptly process contains the solution impregnation of iridium, tantalum and the metal titanium that sintering processes forms top coat;
Anode-cathode Distance: 35～45mm
Volume current density during plating :≤9.8A/L
When the plating workload reaches 30AH/L, replenish BSG12 type additive 50ml/L;
Tank liquor is circulating filtration regularly, when vitriolate of tartar surpasses 200g/L in the solution, solution is cooled to is lower than 2 ℃, filter the vitriolate of tartar of separating out after, the pH value of solution is adjusted to 1.5～2.2 with dilute sulphuric acid or yellow soda ash works on.
That the present invention can obtain on iron and steel parts is continuous, fine and close, complete, combine good thick chromium coating with matrix metal, and chromium coating thickness reaches 40 microns, microhardness HV >=850.
Embodiment:
The used chromium plating solution of the present invention is to improve on main salt, the galvanic anode material selection with trivalent chromium.Adopt BSG12 type trivalent chromium plating liquid (production of Peking blue Li Jiamei chemical science and technology center) for electroplating working fluid; The metallic titanium plate that forms top coat through solution impregnation and the sintering processes that contains iridium, tantalum is as electroplating the DSA anode; Adopt the direct current electrode position power supply, iron and steel parts is electroplated under normal temperature condition through conventional oil removing and activation treatment; The significant parameter of control electroplating process; On iron and steel parts, obtain continuous, fine and close, complete, combine good thick chromium coating with matrix metal, chromium coating thickness reaches 40 microns, microhardness (HV >=850).Concrete technology is following:
Iron and steel parts process electrochemical deoiling, water rinse, the Hydrogen chloride activation, water rinse, zero(ppm) water cleans, and dress is hung workpiece, and electrodeposited chromium goes out the groove washing, drying.
Should meet following technology during electrodeposited chromium:
BSG12 type trivalent chromium plating working fluid is added in the clean coating bath temperature: 15～35 ℃, pH value: 1.5～2.2, current density: 15～45A/dm
2, regulate pH value at processing range with dilute sulphuric acid or yellow soda ash; Anode adopts the DSA anode, and process contains the solution impregnation of iridium, tantalum and the metal titanium that sintering processes forms top coat; Anode-cathode Distance: 35～45mm, volume current density :≤9.8A/L when the plating workload reaches 30AH/L, replenishes BSG12 type additive 50ml/L.The maintenance of tank liquor: regular circulating filtration; When vitriolate of tartar surpasses 200g/L in the solution, solution be cooled to be lower than 2 ℃, filter the vitriolate of tartar of separating out after, the pH value of solution is adjusted to processing range, usefulness works on.
Claims (1)
1. trivalent chromium hard chrome plating method that can form thickness coating, concrete grammar is following: iron and steel parts is through electrochemical deoiling, water rinse, the Hydrogen chloride activation, water rinse, zero(ppm) water cleans, and dress is hung workpiece, and electrodeposited chromium goes out the groove washing, drying; It is characterized in that: the electrodeposited chromium processing condition are following:
Add in the coating bath according to an amount of BSG12 type of the big young pathbreaker of workpiece trivalent chromium plating working fluid, the electroplate liquid condition should meet:
Temperature: 15～35 ℃
Current density: 15～45A/dm
2
PH value: 1.5～2.2, regulate with dilute sulphuric acid or yellow soda ash;
Anode adopts the DSA anode, and promptly process contains the solution impregnation of iridium, tantalum and the metal titanium that sintering processes forms top coat;
Anode-cathode Distance: 35～45mm
Volume current density during plating :≤9.8A/L
When the plating workload reaches 30AH/L, replenish BSG12 type additive 50ml/L;
Tank liquor is circulating filtration regularly, when vitriolate of tartar surpasses 200g/L in the solution, solution is cooled to is lower than 2 ℃, filter the vitriolate of tartar of separating out after, the pH value of solution is adjusted to 1.5～2.2 with dilute sulphuric acid or yellow soda ash works on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210142885XA CN102634825A (en) | 2012-05-10 | 2012-05-10 | Method for plating hard chromium in trivalent chromium bath for forming thick plated layer |
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| CN201210142885XA CN102634825A (en) | 2012-05-10 | 2012-05-10 | Method for plating hard chromium in trivalent chromium bath for forming thick plated layer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334149A (en) * | 2013-06-13 | 2013-10-02 | 中国科学院过程工程研究所 | Periodic intermittent-type hard chrome barrel-plating device and use method thereof |
| CN105063676A (en) * | 2015-08-17 | 2015-11-18 | 内蒙古第一机械集团有限公司 | Method for electroplating hard chromium by using trivalent chromium |
| 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 |
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| CN1880512A (en) * | 2006-05-11 | 2006-12-20 | 武汉大学 | Trivalent chromium electroplating solution in sulfate system and method for preparing same |
| CN101280440A (en) * | 2007-04-02 | 2008-10-08 | 比亚迪股份有限公司 | Whole sulphate type trivalent chromium plating solution and electroplating method using the same |
| 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 |
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2012
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Patent Citations (3)
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| CN1880512A (en) * | 2006-05-11 | 2006-12-20 | 武汉大学 | Trivalent chromium electroplating solution in sulfate system and method for preparing same |
| CN101280440A (en) * | 2007-04-02 | 2008-10-08 | 比亚迪股份有限公司 | Whole sulphate type trivalent chromium plating solution and electroplating method using the same |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334149A (en) * | 2013-06-13 | 2013-10-02 | 中国科学院过程工程研究所 | Periodic intermittent-type hard chrome barrel-plating device and use method thereof |
| CN103334149B (en) * | 2013-06-13 | 2016-04-27 | 中国科学院过程工程研究所 | A kind of cycle intermittent type rolls hard chromium plating device and using method |
| 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 |
| CN105063676A (en) * | 2015-08-17 | 2015-11-18 | 内蒙古第一机械集团有限公司 | Method for electroplating hard chromium by using trivalent chromium |
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Application publication date: 20120815 |