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Electroplating method of aluminum alloy

An aluminum alloy and aluminum alloy-based technology, applied in the field of electroplating of aluminum alloys, can solve problems such as pitting corrosion, segregation, and foaming in aluminum-rich regions, and achieve the effects of wide process range, overcoming segregation, and simple process

Inactive Publication Date: 2009-01-21
童芬德
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum-silicon alloy die castings can easily cause segregation and form an aluminum-rich silicon-rich state. If the pretreatment is too heavy, the pitting corrosion in the aluminum-rich state area will be severe; if the etching is not enough, the silicon-rich state area will not be clean enough. , causing blistering, peeling
So far, there are few reports on the electroplating process that can target all aluminum and aluminum alloy substrates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Chemically degreasing the aluminum alloy base material, the chemical degreasing uses a degreasing solvent, the degreasing solvent adopts sodium phosphate, sodium silicate and sodium carbonate, and the concentration of sodium phosphate is 30%, and the concentration of sodium silicate is 30% by mass percentage. The concentration of sodium carbonate is 20%, the concentration of sodium carbonate is 20%, the temperature of degreasing is 60°C, and the time of degreasing is 3min. After chemical degreasing, it is washed with deionized water at a temperature of 40°C.

[0033] 2) oxidize the aluminum alloy base material after chemical degreasing, water washing and drying, the oxidizing solution adopts phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, the content of sulfuric acid is 15% by volume percentage, the content of hydrochloric acid The content is 0.8%, the content of hydrofluoric acid is 15%, and the content of phosphoric acid is 69.2%. ...

Embodiment 2

[0042] 1) The aluminum alloy base material is chemically degreased, and the chemical degreasing uses a degreasing solvent, and the degreasing solvent adopts sodium phosphate, sodium silicate and sodium carbonate. According to mass percentage, the concentration of sodium phosphate is 35%, and the concentration of sodium silicate The concentration of sodium carbonate is 15%, the concentration of sodium carbonate is 18%, the temperature of degreasing is 70°C, and the time of degreasing is 2min. After chemical degreasing, it is washed with deionized water at a temperature of 35°C.

[0043] 2) oxidize the aluminum alloy base material after chemical degreasing, water washing and drying, the oxidizing solution adopts phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, the content of sulfuric acid is 10% by volume percentage, and the content of hydrochloric acid The content is 1%, the content of hydrofluoric acid is 13%, and the content of phosphoric acid...

Embodiment 3

[0052] 1) The aluminum alloy base material is chemically degreased. The chemical degreasing uses a degreasing solvent, and the degreasing solvent adopts sodium phosphate, sodium silicate and sodium carbonate. According to mass percentage, the concentration of sodium phosphate is 40%, and the concentration of sodium silicate The concentration of sodium carbonate is 10%, the concentration of sodium carbonate is 10%, the temperature of degreasing is 65°C, and the time of degreasing is 4min. After chemical degreasing, it is washed with deionized water at a temperature of 45°C.

[0053] 2) oxidize the aluminum alloy base material after chemical degreasing, water washing and drying, the oxidizing solution adopts phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, the content of sulfuric acid is 20% by volume percentage, the content of hydrochloric acid content is 1.5%, the content of hydrofluoric acid is 10%, the content of phosphoric acid is 68.5%, add...

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Abstract

An electroplating method for aluminum alloy relates to an electroplating method characterized by a technological method, a simple and efficient electroplating method for the aluminum alloy with less pollution, low cost, wide operation range and stable plating coat performance is provided. The electroplating method comprises the steps that an aluminum alloy base material undergoes chemical deoiling, water washing and blow drying and then undergoes oxidation, water washing and blow drying; then the aluminum alloy base material undergoes activation, water washing and blow drying and then undergoes membrane removal and water washing; the aluminum alloy base material which is subjected to membrane removal and water washing undergoes the first neutralization and water washing and then undergoes the first zinc deposition, water washing and zinc deplating; the aluminum alloy base material which is subjected to the first zinc deposition, water washing and zinc deplating undergoes the second zinc deposition, water washing and zinc deplating and then undergoes the second neutralization and water washing; and finally, the aluminum alloy base material after the second neutralization and water washing is plated with watt nickel so as to obtain the an object product.

Description

technical field [0001] The invention relates to an electroplating method characterized by a process method, in particular to an electroplating method for aluminum alloy. Background technique [0002] Among the output of various metals, my country's aluminum output is second only to steel, and my country is also the world's largest producer of electrolytic aluminum. Aluminum and its alloys have the advantages of high specific strength, good thermal and electrical conductivity, plasticity and easy forming, and have been widely used in various industries. With the price increase of copper and zinc metals in the market, the profits of products based on zinc and copper in the hardware industry have decreased a lot, while the price of aluminum has risen slowly, and because of the low density of aluminum and its alloys (the density of aluminum is 2.7g / cm 3 ), compared with other commonly used metals, about three times more parts can be manufactured with the same weight of materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/30C25D5/44C25D3/12
Inventor 童芬德
Owner 童芬德