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Electroplating method of high-strength aluminum alloy for die casting

A technology for casting aluminum alloys and aluminum alloys, which is applied in the electroplating field of high-strength aluminum alloys. It can solve problems such as overall process instability, uneven surface, and unstable performance, and achieve good performance, good bonding layer performance, and performance improvement.

Active Publication Date: 2016-06-15
瑞晟通金属(广东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been found through practice that the performance of this process is unstable between batches, and some batches have bubbles and uneven surfaces, indicating that the process is unstable as a whole, resulting in a high reject rate, therefore, it cannot meet actual needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for electroplating a high-strength aluminum alloy for die-casting, the high-strength aluminum alloy is composed of the following components by weight percentage: Zn: 7%, Si: 14%, Cu: 6%, Mn: 4%, Ti: 0.8%, Re: 0.5%, Mg: 3%, Zr: 3%, Ni: 0.6%, the balance is Al and unavoidable impurities; the electroplating method includes:

[0020] 1) Pre-treatment: Chemical degreasing, oxidation, activation, and film removal are carried out on the die-casting aluminum alloy parts by conventional methods, and the process is washed with water and dried;

[0021] 2) zinc precipitation treatment: the composition of the treatment solution of zinc precipitation treatment is: sodium hydroxide 60g / L, zinc oxide 60g / L, potassium sodium tartrate 100g / L, ferric chloride 5g / L, sodium nitrate 3g / L; The temperature of zinc is 50°C, and the time of zinc precipitation is 20s; carry out 3 times of zinc precipitation treatment;

[0022] 3) Electroplating nickel treatment: the composition and tre...

Embodiment 2

[0025] An electroplating method for high-strength aluminum alloys for die-casting, the high-strength aluminum alloys are composed of the following components by weight percentage: Zn: 9%, Si: 12%, Cu: 8%, Mn: 2%, Ti: 1.2%, Re: 0.3%, Mg: 5%, Zr: 1%, Ni: 0.8%, the balance is Al and unavoidable impurities; the electroplating method includes:

[0026] 1) Pre-treatment: Chemical degreasing, oxidation, activation, and film removal are carried out on the die-casting aluminum alloy parts by conventional methods, and the process is washed with water and dried;

[0027] 2) zinc precipitation treatment: the composition of the treatment solution of zinc precipitation treatment is: sodium hydroxide 80g / L, zinc oxide 40g / L, potassium sodium tartrate 120g / L, ferric chloride 3g / L, sodium nitrate 5g / L; The temperature of zinc is 30°C, and the time of zinc precipitation is 40s; carry out 3 times of zinc precipitation treatment;

[0028] 3) Electroplating nickel treatment: the composition and t...

Embodiment 3

[0031] An electroplating method for high-strength aluminum alloys for die-casting, the high-strength aluminum alloys are composed of the following components by weight percentage: Zn: 8%, Si: 13%, Cu: 7%, Mn: 3%, Ti: 1.0%, Re: 0.4%, Mg: 4%, Zr: 2%, Ni: 0.7%, the balance is Al and unavoidable impurities; the electroplating method includes:

[0032] 1) Pre-treatment: Chemical degreasing, oxidation, activation, and film removal are carried out on the die-casting aluminum alloy parts by conventional methods, and the process is washed with water and dried;

[0033]2) zinc precipitation treatment: the composition of the treatment solution of zinc precipitation treatment is: sodium hydroxide 70g / L, zinc oxide 50g / L, potassium sodium tartrate 110g / L, ferric chloride 4g / L, sodium nitrate 4g / L; The temperature of zinc is 40°C, and the time of zinc precipitation is 30s; carry out 3 times of zinc precipitation treatment;

[0034] 3) Electroplating nickel treatment: the composition and tr...

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Abstract

The invention discloses an electroplating method of high-strength aluminum alloy for die casting. The electroplating method of the high-strength aluminum alloy for die casting is characterized in that the high-strength aluminum alloy comprises the following components in percentages by weight: 7-9% of Zn, 12-14% of Si, 6-8% of Cu, 2-4% of Mn, 0.8-1.2% of Ti, 0.3-0.5% of Re, 3-5% of Mg, 1-3% of Zr, 0.6-0.8% of Ni, and the balance Al and inevitable impurities. The electroplating method comprises the following steps: (1) pretreatment; (2) zinc depositing treatment: carrying out zinc depositing treatment for three times, wherein a zinc depositing treatment solution comprises the following components: 60-80 g / L of sodium hydroxide, 40-60 g / L of zinc oxide, 100-120 g / L of sodium potassium tartrate tetrahydrate, 3-5 g / L of ferric chloride and 3-5 g / L of sodium nitrate, zinc depositing temperature is 30-50 DEG C, and zinc depositing time is 20-40 seconds; (3) electronickelling treatment, wherein an electronickelling solution comprises the following components: 160-180 g / L of NiSO4.6H2O, 0.6-0.8 mol / L of F<->, 20-30 g / L of boric acid, 22-24 g / L of (NH4)3C6H5O7 and 1-3 g / L of sodium saccharin, and treatment conditions are as follows: pH value is 4.8-5.4, current density of a cathode is 2-4 A / d m<2>, temperature is 45-55 DEG C, and time is 20-30 minutes; and (4) surface layer nickel, chromium or copper plating.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an electroplating method for die-casting high-strength aluminum alloys. 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 m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C25D5/12C25D3/12C25D3/22
CPCC22C21/02C25D3/12C25D3/22C25D5/12
Inventor 张颖
Owner 瑞晟通金属(广东)有限公司
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