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Heat treatment method of ultrahard aluminum alloy after chemical nickel-plating

A heat treatment method and electroless nickel plating technology, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problem of the decrease of hardness and strength of super-duralumin substrate, the decrease of hardness of super-duralumin substrate, and the inability to increase significantly Coating hardness and other issues to achieve the effect of expanding the application field and solving the problem of low wear resistance

Inactive Publication Date: 2010-07-14
ZHEJIANG UNIV
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  • Summary
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  • Application Information

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Problems solved by technology

However, since the super-duralumin aging temperature is 120°C, the heat treatment to increase the hardness of the coating at 400°C will inevitably lead to a significant decrease in the hardness and strength of the super-duralumin matrix.
However, the low-temperature heat treatment at 120°C cannot significantly increase the hardness of the coating.
[0006] For this reason, in order to use electroless nickel plating for the wear-resistant treatment of superhard aluminum alloy surfaces, this contradiction must be resolved: high temperature heat treatment at 400 °C can increase the hardness of the coating, but lead to a decrease in the hardness of the superhard aluminum substrate; while low temperature heat treatment can maintain the hardness of the substrate. Hardness, but the hardness of the coating cannot be improved

Method used

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  • Heat treatment method of ultrahard aluminum alloy after chemical nickel-plating

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Embodiment 1

[0022] 1mm thick LC4 superhard aluminum alloy, hardness 120Hv. 5% sodium hydroxide solution 55 ℃, 3min alkali washing, immersion in 50% nitric acid solution for 30s after water washing, immersion in zinc at room temperature for 60s after water washing (the composition of zinc immersion solution is: 240g / L sodium hydroxide+120g / L zinc sulfate+60g / L nickel sulfate+120g / L potassium sodium tartrate+5g / L ferric chloride), 50% nitric acid immersion 5s, after washing with water, dip zinc at room temperature for 30s, after washing, immerse in alkaline electroless nickel plating solution (plating solution consists of: 25g / L L nickel sulfate + 25g / L sodium hypophosphite + 45g / L sodium citrate + 30g / L ammonium chloride, adjust the pH value to 9 with ammonia water, plate at 45°C for 10min, take it out and wash it, then immerse it in the acidic nickel plating solution ( The composition of the plating solution is: 25g / L nickel sulfate + 25g / L sodium hypophosphite + 20g / L lactic acid + 20g / ...

Embodiment 2

[0025] 1mm thick LC4 superhard aluminum alloy electroless nickel plating, the method is as embodiment 1.

[0026] Put the sample in an electric furnace at 475°C for 20 minutes, quench water, and hold at 120°C for 24 hours. The hardness of the substrate is 141Hv, and the hardness of the coating is 880Hv;

Embodiment 3

[0028] 1mm thick LC9 superhard aluminum alloy, hardness 152Hv, electroless nickel plating method as in Example 1. The resulting coating had a hardness of 450 Hv.

[0029] Put the sample in an electric furnace at 465°C for 30 minutes, quench water, and hold at 120°C for 24 hours. The hardness of the substrate is 160Hv, and the hardness of the coating is 860Hv;

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Abstract

The invention discloses a heat treatment method of ultrahard aluminum alloy after chemical nickel-plating. The method comprises the following steps of: carrying out the chemical nickel-plating firstly on the ultrahard aluminum alloy, i.e. carrying out alkali washing, acid washing, zinc dipping, water washing, secondary zinc dipping, alkaline chemical nickel-plating, acid chemical nickel-plating and water washing; carrying out ageing treatment by using the solid solution heat treatment temperature of a matrix as the heat treatment temperature for hardening a plating layer; and at the same time of guaranteeing the hardness and the strength of the ultrahard aluminum alloy matrix, obtaining a high-hardness chemical nickel-plating layer on the surface. Moreover, the method is environmentally friendly and saves energy. By adopting the method, the weakness of low ultrahard aluminum alloy abrasive resistance can be overcome, and the application field of the ultrahard aluminum alloy is enlarged.

Description

technical field [0001] The invention relates to a metal material surface wear-resistant treatment method, in particular to a heat treatment method involving electroless nickel plating on the surface of a superhard aluminum alloy. Background technique [0002] Superhard aluminum alloy has the characteristics of high strength, low density, good processing performance and process performance, and is widely used in important fields such as aerospace and military industry, as well as civil industries such as textile devices. The excellent mechanical properties of super duralumin need to be obtained through solution + aging heat treatment. The conventional process is solution treatment at 485°C followed by water cooling + aging treatment at 120°C. [0003] With the expansion of the scope of application, the parts made of superhard aluminum alloys, such as cabinet guide rails, have further put forward wear-resistant performance requirements, so it is necessary to carry out wear-res...

Claims

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Application Information

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IPC IPC(8): C23C18/32
Inventor 钱红妹楼晓璐凌国平
Owner ZHEJIANG UNIV
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