CN103046094A - Composite chromium electroplating method on metal surface - Google Patents

Composite chromium electroplating method on metal surface Download PDF

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Publication number
CN103046094A
CN103046094A CN2011103083695A CN201110308369A CN103046094A CN 103046094 A CN103046094 A CN 103046094A CN 2011103083695 A CN2011103083695 A CN 2011103083695A CN 201110308369 A CN201110308369 A CN 201110308369A CN 103046094 A CN103046094 A CN 103046094A
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Prior art keywords
chromium
plating
electroplate liquid
electroplating
milky white
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CN2011103083695A
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CN103046094B (en
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蓝双城
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Shaoguan Huajun Machinery Co Ltd
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Shaoguan Huajun Machinery Co Ltd
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Abstract

The invention provides a composite chromium electroplating method on a metal surface. The method employs a sectionalized and slotted process, comprising the steps of firstly electroplating milky white chromium on a surface of a metal material according to a conventional method, then performing secondary electroplating by placing the metal material electroplated by the milky white chromium into another electroplating tank and adding alumina in a secondary electroplating solution. A composite electroplating layer is formed after the metal material is electroplated two times, the electroplating layer is uniformly distributed on the surface of the metal, a hardness reaches HV950-1,100, corrosion resistant strength is 3 times or more that of a conventional chromium electroplating layer, and the composite electroplating layer has superior performance and wide application prospects and economical value.

Description

A kind of metallic surface composite chrome plating method
Technical field
The present invention relates to a kind of electro-plating method, be specifically related to the method for a kind of metallic surface chromium plating.
Background technology
Chromium is a kind of pearl opal polyvalent metal element, and ordination number 24 only exists with combined form.Chromium cpd has erosion-resisting characteristic, is widely used in alloy and field of electroplating.Electrodeposited chromium can significantly improve intensity, hardness and the wear resistance of metallic substance.
Conventional chrome-plating method mainly comprises at present: the types such as decoration chrome plating, hard chrome plating, milky white chromium, black chromium plating.
Wherein the chromium plating of metallic substance mainly is two kinds of hard chrome plating and milky white chromium in the mechanical industry.
Milky white chromium coating crystallization is careful, good toughness, and solidity to corrosion is strong; But porosity is low, color is milky white, and glossiness is poor.
Hard chromium then has good wear resistance, but solidity to corrosion is poor.
Adopt ordinary method to carry out chromium plating and be difficult to reach simultaneously the not only against corrosion but also wear-resisting purpose of plating piece, can't adapt to the requirement that mechanical industry promotes day by day to metallic substance.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of metallic surface composite chrome plating method, and described method adopts segmentation, minute groove to electroplate and forms compound chromium coating, and this compound chromium coating makes the plating piece metallic substance have stronger corrosion stability and wear resistance concurrently.
The method of the invention adopts two kinds of different electroplate liquids, and described plating solution formula is composed as follows:
Electroplate liquid one: contain chromium trioxide 180-200g/L, sulfuric acid 2.5-3.5g/L;
Electroplate liquid two: contain chromium trioxide 200-250g/L, sulfuric acid 2.5-4g/L, aluminium sesquioxide 3-6g/L.
The concrete operation step of the method for the invention is as follows:
The technological method of step 1, employing the art routine cleans metal material surface, makes the metallic surface sensitization;
Step 2, plate milky white chromium: electroplate liquid one is poured in the plating tank one, the temperature of electroplate liquid one is risen to 70 ℃-75 ℃;
To the plating tank energising, plating thickness in the metallic surface is the milky white chromium of 0.05-0.08mm;
Step 3, secondary chromium plating: electroplate liquid two is poured in the plating tank two, the temperature of electroplate liquid two is risen to 40 ℃-45 ℃, the metal that has plated milky white chromium in the step 2 is carried out surface cleaning again, be placed into and carry out second time electroplating in the plating tank two, to the plating tank energising, plate again the chromium layer that thickness is 0.08-0.10mm on milky white chromium layer surface.
The composite deposite hardness that forms by electro-plating method provided by the invention reaches HV950-1100, and the conventional chromium coating of corrosion protection strength ratio strengthens more than three times.Physicals, coating structure optimization, mechanical property also is optimized.
The energising step of chrome-plating method step 2 of the present invention and step 3 is undertaken by the art common technology method, and forward current is decided for the surface area according to workpiece, generally adopts 40A/dm 2, wherein 40A is forward current intensity; The time that forward is electroplated decides according to the thickness of coating needs.Electric current in the time of oppositely is 30-50A, time to be 15-30 second.
Chrome-plating method of the present invention is applicable to mechanical industry metallic substance commonly used, such as ironworker's part, steel etc.
The operation of chromium plating also can realize by other the art technique means commonly used in the step 2, is not limited to the cited working method of the present invention.The composite chrome plating method of the technique means performing step two that employing is equal to should be treated as within the protection domain that is included in the present patent application.
Specific embodiment
Embodiment one
Concrete operations:
Press following formulated electroplate liquid one and electroplate liquid two:
Electroplate liquid one: contain chromium trioxide 180g/L, sulfuric acid 2.5g/L;
Electroplate liquid two: contain chromium trioxide 200g/L, sulfuric acid 2.5g/L, aluminium sesquioxide 3g/L.
By following operation steps metallic substance is electroplated:
Step 1, Cast Iron Surface is cleaned, make the Cast Iron Surface sensitization;
Step 2, plate milky white chromium: electroplate liquid one is poured in the plating tank one, the temperature of electroplate liquid one is risen to 70 ℃, to insert in the plating tank one through the cast iron of surface activation in the step 1, plating tank one energising plates the milky white chromium that thickness is 0.05mm in Cast Iron Surface;
Step 3, secondary chromium plating: electroplate liquid two is poured in the plating tank two, the temperature of electroplate liquid two is risen to 40 ℃, the cast iron that plates milky white chromium is carried out surface cleaning again, be placed into and carry out second time electroplating in the plating tank two, to the plating tank energising, plate again the chromium layer that thickness is 0.08mm on the surface of milky white chromium;
Embodiment two
Electroplate liquid one: contain chromium trioxide 200g/L, sulfuric acid 3.5g/L;
Electroplate liquid two: contain chromium trioxide 250g/L, sulfuric acid 4g/L, aluminium sesquioxide 6g/L.
The concrete operation step of the method for the invention is as follows:
The technological method of step 1, employing the art routine cleans 45 steel workpiece surfaces, makes 45 steel workpiece surface sensitizations;
Step 2, plate milky white chromium: electroplate liquid one is poured in the plating tank one, the temperature of electroplate liquid one is risen to 75 ℃; To the plating tank energising, plate the milky white chromium that thickness is 0.08mm at 45 steel workpiece surfaces;
Step 3, secondary chromium plating: electroplate liquid two is poured in the plating tank two, the temperature of electroplate liquid two is risen to 45 ℃, 45 steel workpieces that plated milky white chromium in the step 2 are carried out surface cleaning again, be placed into and carry out second time electroplating in the plating tank two, to the plating tank energising, plate again the chromium layer that thickness is 0.10mm on milky white chromium layer surface;
Interpretation of result:
Use the art routine techniques means that the metallic substance of electroplating through the method for the invention among embodiment one, the embodiment two is carried out Performance Detection, the result shows: the composite deposite hardness that forms by electro-plating method provided by the invention all reaches HV950-1100, and the conventional chromium coating of corrosion protection strength ratio strengthens more than three times.
From experimental result, through the method for the invention by segmentation electroplate, the improvement plating solution formula, optimized coating structure, Physical Properties of Metallicmateriais after the plating and mechanical property are compared with conventional chrome-plated metal larger lifting.

Claims (3)

1. metallic surface composite chrome plating method, its step comprises:
Step 1, metal material surface is cleaned, make the metallic surface sensitization;
Step 2, plate milky white chromium: electroplate liquid one is poured in the plating tank one, the temperature of electroplate liquid one is risen to 70 ℃-75 ℃; To the plating tank energising, plating thickness is the milky white chromium of 0.05-0.08mm in the metallic surface;
Step 3, secondary chromium plating: electroplate liquid two is poured in the plating tank two, the temperature of electroplate liquid two is risen to 40 ℃-45 ℃, the metal that has plated milky white chromium in the step 2 is carried out surface cleaning again, be placed into and carry out second time electroplating in the plating tank two, to the plating tank energising, plate again the chromium layer that thickness is 0.08-0.10mm on milky white chromium layer surface.
2. the method for claim 1 is characterized in that: described electroplate liquid one is for containing the aqueous solution of chromium trioxide 180-200g/L, sulfuric acid 2.5-3.5g/L.
3. method as claimed in claim 2 is characterized in that: described electroplate liquid two is for containing the aqueous solution of chromium trioxide 200-250g/L, sulfuric acid 2.5-4g/L, aluminium sesquioxide 3-6g/L.
CN201110308369.5A 2011-10-12 2011-10-12 A kind of metallic surface composite chrome plating method Active CN103046094B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106884188A (en) * 2015-12-16 2017-06-23 宝山钢铁股份有限公司 A kind of preparation method of the plating solution, plating technology and conductive rollers coating for forming conductive rollers coating
CN108130570A (en) * 2017-12-15 2018-06-08 北京科技大学 A kind of compound trivalent plating chromium process
CN109097805A (en) * 2018-08-02 2018-12-28 哈尔滨飞机工业集团有限责任公司 A kind of chrome-plated process method
CN109183084A (en) * 2018-11-20 2019-01-11 重庆建设工业(集团)有限责任公司 A kind of method of pipe fitting inner hole composite chrome plating and chrome-plating device for this method
CN111364073A (en) * 2020-02-25 2020-07-03 光山白鲨针布有限公司 Preparation process and product of anticorrosive wear-resistant chromium-based card clothing

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CN101418458A (en) * 2008-11-12 2009-04-29 娄底市中兴液压件有限公司 Double layer chromium electroplating processing process for conveying cylinder

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CN101372756A (en) * 2008-09-28 2009-02-25 武汉船用机械有限责任公司 Chrome plating method for spherical crown surface of major diameter spherical crown workpiece
CN101418458A (en) * 2008-11-12 2009-04-29 娄底市中兴液压件有限公司 Double layer chromium electroplating processing process for conveying cylinder

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106884188A (en) * 2015-12-16 2017-06-23 宝山钢铁股份有限公司 A kind of preparation method of the plating solution, plating technology and conductive rollers coating for forming conductive rollers coating
CN108130570A (en) * 2017-12-15 2018-06-08 北京科技大学 A kind of compound trivalent plating chromium process
CN109097805A (en) * 2018-08-02 2018-12-28 哈尔滨飞机工业集团有限责任公司 A kind of chrome-plated process method
CN109183084A (en) * 2018-11-20 2019-01-11 重庆建设工业(集团)有限责任公司 A kind of method of pipe fitting inner hole composite chrome plating and chrome-plating device for this method
CN111364073A (en) * 2020-02-25 2020-07-03 光山白鲨针布有限公司 Preparation process and product of anticorrosive wear-resistant chromium-based card clothing
CN111364073B (en) * 2020-02-25 2021-06-04 光山白鲨针布有限公司 Preparation process and product of anticorrosive wear-resistant chromium-based card clothing

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