CN105177642A - Electrochromism combined plating solution for aluminum alloy hub - Google Patents
Electrochromism combined plating solution for aluminum alloy hub Download PDFInfo
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- CN105177642A CN105177642A CN201510721946.1A CN201510721946A CN105177642A CN 105177642 A CN105177642 A CN 105177642A CN 201510721946 A CN201510721946 A CN 201510721946A CN 105177642 A CN105177642 A CN 105177642A
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Abstract
The invention discloses an electrochromism combined plating solution for an aluminum alloy hub. The electrochromism combined plating solution is characterized by being composed of an electronickelling plating solution, a pyrophosphate copper plating solution and an electrochromism plating solution; the electronickelling plating solution is prepared from 80-90 g/L of nickel sulfate, 0.8-0.9 mol/L of fluorine ions, 15-20 g/L of ammonium citrate and 1-3 g/L of sodium sulfate; the pyrophosphate copper plating solution is prepared from 65-75 g/L of copper pyrophosphate, 230-240 g/L of potassium pyrophosphate and 28-32 g/L of ammonium citrate; the electrochromism plating solution is prepared from 260-280 g/L of chromic anhydride, 1.5-2.5 g/L of sulfuric acid, 2.0-2.2 g/L of trivalent chromium, 0.01-0.03 mol/L of lauryl sodium sulfate and 15-25 g/L of sodium sulfate.
Description
Technical field
The present invention relates to electroplating technology field, particularly relate to a kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution.
Background technology
Aluminium alloy possesses lightweight, the excellent properties such as specific tenacity is high, Anti-impact shock-absorbing, is considered to steel wheel hub substitute fabulous in automotive industry.Aluminium alloy is applied to automotive industry, can alleviate vehicle weight, is the effective way reducing energy consumption and reduce exhaust gas emission.Wheel hub accounts for one of larger parts of complete vehicle weight, utilizes aluminium alloy as the material manufacturing wheel hub, can reach the object effectively alleviating car weight.At present, the wheel hub manufactured by aluminium alloy has been widely applied on automobile.But the chemical property of aluminium alloy is very active, and corrosion resisting property is poor, is easy to the destruction such as spot corrosion and galvanic corrosion occurs in environment for use, and the safety for automobile constitutes a serious threat.Therefore, corrosion prevention is aluminium alloy one of sixty-four dollar question when automotive field is applied.
At present, plated metal combined plating on aluminium alloy automobile hub, document relevant in the world and patented technology report are seldom.Although existing plating on aluminium alloy treatment technology successfully can obtain metal plating in surface of aluminum alloy hub, there is defect and the deficiency of the following aspects:
(1) aluminium alloy prussiate strike copper plating technique employs the prussiate of severe toxicity, the large and contaminate environment to human health damage.
(2) aluminium alloy leaching zinc after in pyrophosphate solution Direct Electroplating copper, easily occur copper coating and aluminum alloy substrate bonding force bad.Because the complex ability of pyrophosphate ion to cupric ion is poor, the electromotive force of aluminum alloy substrate and metallic copper differs greatly, and in pyrophosphate solution during electro-coppering, violent replacement(metathesis)reaction occurs for substrate aluminium and cupric ion, and the bonding force of copper coating and substrate is declined.The compactness of pre-plating layer is inadequate, the plating piece corrosion when acid coppering.
Therefore, a kind of technique of carrying out electrodeposited chromium protective layer in aluminum alloy surface is needed badly to obtain suitable coating.
Summary of the invention
The object of the invention is to propose a kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution, adopt this plating solution to electroplate and can obtain in surface of aluminum alloy hub the metal-plated layers of chrome that bonding force is strong, solidity to corrosion is high.
For reaching this object, the present invention by the following technical solutions:
A kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution, this electroplating bath solution is made up of electronickelling plating solution, pyrophosphate copper plating plating solution and electrodeposited chromium plating solution three part, wherein electronickelling plating solution is: single nickel salt: 80-90g/L, fluorion: 0.8-0.9mol/L, ammonium citrate: 15-20g/L, sodium sulfate: 1-3g/L; Wherein pyrophosphate copper plating plating solution is: cupric pyrophosphate: 65-75g/L, potassium pyrophosphate: 230-240g/L, ammonium citrate: 28-32g/L; Wherein electrodeposited chromium plating solution is: chromic anhydride: 260-280g/L, sulfuric acid: 1.5-2.5g/L, trivalent chromium: 2.0-2.2g/L, sodium lauryl sulphate: 0.01-0.03mol/L, sodium sulfate: 15-25g/L.
The adoptable technique of the present invention comprises the steps: mechanical polishing → paraffin removal → alkali cleaning → pickling → activation → leaching zinc → electronickelling → pyrophosphate copper plating → electrodeposited chromium, wherein washes with a water respectively between above steps.
The processing parameter that wherein electronickelling can adopt is: pH value: 4-4.5, cathode current density: 2-4A/dm
2, temperature: about 45-55 DEG C, time: 20-30min;
The processing parameter that wherein pyrophosphate copper plating can adopt is: temperature: about 45-50 DEG C, cathode current density: 2-3A/dm
2, the time: 12-16min;
The processing parameter that wherein electrodeposited chromium can adopt is: temperature: about 45-55 DEG C, cathode current density: 16-18A/dm
2, the time: 10-20min.
Other operation in step adopts the ordinary method of prior art.
The present invention focuses on adjusting solution composition, by the adjustment to solution composition, the particularly solution composition of emphasis regulation and control electronickelling → these three processing steps of pyrophosphate copper plating → electrodeposited chromium, in plating process, above-mentioned three processing steps will control in strict accordance with the solution composition in technique scheme.After adopting such scheme, can realize not adopting plating semi-bright nickel, bright nickel, and do not adopt the bottoming techniques such as electroless plating, eliminate the processing step of these complexity, change into and only adopt the double-deck bottoming of electronickelling/tetra-sodium copper facing, reach than adopting the technique effect that these techniques are also excellent, and save production cost, improve production efficiency.
The present invention has following beneficial effect:
1. employing the present invention combines chromium coating rotproofness excellence prepared by plating solution method, and salt-fog test is greater than 260h surface and has no variable color.Be applicable to wheel hub life-time service under sleet feels well mist complex working condition.
2. the double-deck bottoming of electronickelling/tetra-sodium copper facing, bottoming compactness of electroplating is high, strong with the bonding force of aluminum alloy substrate, can provide good substrate for follow-up chromium plating, make coating and basal body binding force high, antistrip performance is good, good mechanical property.Coating surface hardness is high, can reach HV1050-1150, rub resistance and cut.And unit elongation is greater than 10%.
3. the coating porosity adopting plating solution of the present invention to prepare is less than 2 holes/cm
2, surface smoothness is high, and shiny appearance is attractive in appearance, has good decorative appearance.
Embodiment
Embodiment one
A kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution, this electroplating bath solution is made up of electronickelling plating solution, pyrophosphate copper plating plating solution and electrodeposited chromium plating solution three part, and wherein electronickelling plating solution is: single nickel salt: 80g/L, fluorion: 0.9mol/L, ammonium citrate: 15g/L, sodium sulfate: 3g/L; Wherein pyrophosphate copper plating plating solution is: cupric pyrophosphate: 65g/L, potassium pyrophosphate: 240g/L, ammonium citrate: 28g/L; Wherein electrodeposited chromium plating solution is: chromic anhydride: 260g/L, sulfuric acid: 2.5g/L, trivalent chromium: 2.0g/L, sodium lauryl sulphate: 0.03mol/L, sodium sulfate: 15g/L.
Embodiment two
A kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution, this electroplating bath solution is made up of electronickelling plating solution, pyrophosphate copper plating plating solution and electrodeposited chromium plating solution three part, and wherein electronickelling plating solution is: single nickel salt: 90g/L, fluorion: 0.8mol/L, ammonium citrate: 20g/L, sodium sulfate: 1g/L; Wherein pyrophosphate copper plating plating solution is: cupric pyrophosphate: 75g/L, potassium pyrophosphate: 230g/L, ammonium citrate: 32g/L; Wherein electrodeposited chromium plating solution is: chromic anhydride: 280g/L, sulfuric acid: 1.5g/L, trivalent chromium: 2.2g/L, sodium lauryl sulphate: 0.01mol/L, sodium sulfate: 25g/L.
Embodiment three
A kind of aluminium alloy wheel hub electrodeposited chromium combination plating solution, this electroplating bath solution is made up of electronickelling plating solution, pyrophosphate copper plating plating solution and electrodeposited chromium plating solution three part, and wherein electronickelling plating solution is: single nickel salt: 85g/L, fluorion: 0.85mol/L, ammonium citrate: 17.5g/L, sodium sulfate: 2g/L; Wherein pyrophosphate copper plating plating solution is: cupric pyrophosphate: 70g/L, potassium pyrophosphate: 235g/L, ammonium citrate: 30g/L; Wherein electrodeposited chromium plating solution is: chromic anhydride: 270g/L, sulfuric acid: 2.0g/L, trivalent chromium: 2.1g/L, sodium lauryl sulphate: 0.05mol/L, sodium sulfate: 20g/L.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (2)
1. an aluminium alloy wheel hub electrodeposited chromium combination plating solution, it is characterized in that: this electroplating bath solution is made up of electronickelling plating solution, pyrophosphate copper plating plating solution and electrodeposited chromium plating solution three part, wherein electronickelling plating solution is: single nickel salt: 80-90g/L, fluorion: 0.8-0.9mol/L, ammonium citrate: 15-20g/L, sodium sulfate: 1-3g/L; Wherein pyrophosphate copper plating plating solution is: cupric pyrophosphate: 65-75g/L, potassium pyrophosphate: 230-240g/L, ammonium citrate: 28-32g/L; Wherein electrodeposited chromium plating solution is: chromic anhydride: 260-280g/L, sulfuric acid: 1.5-2.5g/L, trivalent chromium: 2.0-2.2g/L, sodium lauryl sulphate: 0.01-0.03mol/L, sodium sulfate: 15-25g/L.
2. a kind of aluminium alloy wheel hub electrodeposited chromium combination solution as claimed in claim 1, wherein nickel plating solution is: single nickel salt: 85g/L, fluorion: 0.85mol/L, ammonium citrate: 17.5g/L, sodium sulfate: 2g/L; Wherein pyrophosphate copper plating solution is: cupric pyrophosphate: 70g/L, potassium pyrophosphate: 235g/L, ammonium citrate: 30g/L; Wherein electric chrome solution is: chromic anhydride: 270g/L, sulfuric acid: 2.0g/L, trivalent chromium: 2.1g/L, sodium lauryl sulphate: 0.05mol/L, sodium sulfate: 20g/L.
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| CN201510721946.1A CN105177642A (en) | 2015-10-30 | 2015-10-30 | Electrochromism combined plating solution for aluminum alloy hub |
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| CN201510721946.1A CN105177642A (en) | 2015-10-30 | 2015-10-30 | Electrochromism combined plating solution for aluminum alloy hub |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543917A (en) * | 2016-01-05 | 2016-05-04 | 张颖 | Double-bottoming electroplating method for nickel-plating magnesium alloy hub |
| CN106521590A (en) * | 2017-01-10 | 2017-03-22 | 深圳市常兴技术股份有限公司 | Aluminum alloy blank and diamond composite electroplating process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105543917A (en) * | 2016-01-05 | 2016-05-04 | 张颖 | Double-bottoming electroplating method for nickel-plating magnesium alloy hub |
| CN106521590A (en) * | 2017-01-10 | 2017-03-22 | 深圳市常兴技术股份有限公司 | Aluminum alloy blank and diamond composite electroplating process |
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Application publication date: 20151223 |