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Electroplating method of aluminum alloy

An aluminum alloy and aluminum alloy-based technology, which is applied in the field of aluminum alloy electroplating, can solve the problems of pitting corrosion, blistering and segregation in the aluminum-rich region, and achieve the effect of wide process range, simple process and overcoming segregation.

Inactive Publication Date: 2010-06-16
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) The aluminum alloy base material is chemically deoiled. The chemical degreasing uses a degreasing solvent. The degreasing solvent uses sodium phosphate, sodium silicate and sodium carbonate. The concentration of sodium phosphate is 30% and the concentration of sodium silicate is determined by mass percentage. It is 20%, the concentration of sodium carbonate is 20%, the degreasing temperature is 60℃, and the degreasing time is 3min. After chemical degreasing, it is washed with deionized water at a temperature of 40℃ and dried after washing.

[0033] 2) The aluminum alloy substrate is oxidized after chemical degreasing, water washing, and drying. The oxidizing solution uses phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, and the sulfuric acid content is 15% by volume percentage. The content is 0.8%, the content of hydrofluoric acid is 15%, and the content of phosphoric acid is 69.2%. Add thiourea to the oxidation solution. The amount of t...

Embodiment 2

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

[0043] 2) The aluminum alloy substrate is oxidized after chemical degreasing, water washing, and drying. The oxidizing solution uses phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, and the sulfuric acid content is 10% by volume percentage. The content is 1%, the content of hydrofluoric acid is 13%, and the content of phosphoric acid is 76%. Add thiourea to the oxidizing so...

Embodiment 3

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

[0053] 2) The aluminum alloy substrate is oxidized after chemical degreasing, water washing, and drying. The oxidizing solution uses phosphoric acid, sulfuric acid, hydrochloric acid, hydrofluoric acid and thiourea, and the sulfuric acid content is 20% by volume percentage. The content of thiourea is 1.5%, the content of hydrofluoric acid is 10%, and the content of phosphoric acid is 68.5%. Add thiourea to the oxidation solution. ...

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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 undergoesthe 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 of aluminum alloy. Background technique [0002] Among the various metal output, my country's aluminum output is second only to steel, and my country is the world's largest producer of electrolytic aluminum. Aluminum and its alloys have the advantages of high specific strength, good thermal and electrical conductivity, as well as plasticity and easy forming, and have been widely used in various industries. With the increase in the price of copper and zinc in the market, the profits of the hardware industry’s products based on zinc and copper have been reduced a lot, while the price of aluminum has risen slowly, due to the low density of aluminum and its alloys (the density of aluminum is 2.7g / cm 3 ), compared with other commonly used metals, the same weight of material can produce about three times more parts. Many manufacturers a...

Claims

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Application Information

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