Method for electroplating environment-friendly chromium on aluminum and aluminum alloy parts

An environmental protection technology for aluminum alloy parts, applied in the field of environmental protection chromium electroplating of aluminum and aluminum alloy parts, can solve the problems of the need to improve corrosion resistance, poor electroplating bonding force of aluminum and aluminum alloy parts, and poor corrosion resistance, etc. The effect of low capacity requirements, simple electroplating process and stable product quality

Pending Publication Date: 2021-09-28
JOMOO KITCHEN & BATHROOM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, aluminum and aluminum alloy parts treated by decorative chrome plating process have quality problems such as blistering and peeling, poor bonding force, and easy corrosion in the inspection after electroplating and the use of users, such as patent CN102220613A, which solves the problem of product Bonding problem, but corrosion resistance needs to be improved
[0004] This technology aims to solve the problems of poor electroplating bonding force and poor corrosion resistance of aluminum and aluminum alloy parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The 6063 and 6463 profile aluminum alloy parts are electroplated with environmentally friendly chromium through the following steps:

[0044] Degreasing: aluminum alloy part is put into containing sodium hydroxide 60wt%, sodium carbonate 7.5wt%, sodium metasilicate 13wt%, trisodium phosphate 1.5wt% and 4-butynediol 0.6wt%, degreaser ( In the WIN-58B) 20g / L degreasing liquid produced by Guangdong Shanzhifeng Environmental Protection Technology Co., Ltd., degreasing and degreasing at a temperature of 70°C;

[0045] Washing: Rinse the aluminum alloy parts with tap water for 6 minutes, so that the pH value of the surface of the aluminum alloy substrate is 6;

[0046] Alkali cleaning: Put the above-mentioned aluminum alloy parts after water washing into a mixed solution containing 17g / L sodium hydroxide, 30g / L sodium carbonate, and 25g / L trisodium phosphate, and carry out alkali cleaning at 65°C for 2 minutes ;

[0047] Washing: Rinse the aluminum alloy parts with tap wate...

Embodiment 2

[0072] The 6063 and 6463 profile aluminum alloy parts are electroplated with environmentally friendly chromium through the following steps:

[0073] This embodiment adopts the same process steps as in Example 1, except that in Example 1, trivalent white chrome is electroplated, and in this embodiment, trivalent black chrome is electroplated; other processes are carried out according to the process steps in Example 1.

[0074] Trivalent black chromium: Put the cleaned aluminum alloy parts into 250g / L ammonium chloride, 75g / L chromium potassium oxalate, 30g / L potassium dihydrogen phosphate, 45g / L ammonium formate, 3g / L amino Acetic acid, 8.5g / L hydroxylamine hydrochloride, 0.7g / L stannous sulfate, 75g / L boric acid, 3g / L potassium thiocyanate, 4g / L methionine and 7.5g / L citric acid solution.

Embodiment 3

[0076] The 6063 and 6463 profile aluminum alloy parts are electroplated with environmentally friendly chromium through the following steps:

[0077] This embodiment adopts the same process steps as in Example 1, the difference is that the time of two zinc dips is different. In this embodiment, the time of one dip zinc is 60s, and the time of second dip zinc is 40s; others are all according to Example 1. process steps are carried out.

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Abstract

The invention discloses a method for electroplating environment-friendly chromium on aluminum and aluminum alloy parts. The method comprises the step: performing oil removal, alkali washing, acid pickling, primary zinc dipping, zinc stripping, secondary zinc dipping, cyanide-free alkali copper plating, nickel pre-plating, acid copper plating, activation, semi-bright nickel plating, full-bright nickel plating, nickel sealing and trivalent chromium treatment on the aluminum or aluminum alloy parts sequentially. By adopting the method, the environment-friendly chromium coating with super corrosion resistance and high binding force can be formed on the surface of the aluminum or aluminum alloy part, the method is simple and convenient to implement, the requirement on the technical capability of operators is not high, and the quality of the produced product is very stable.

Description

technical field [0001] The invention belongs to the field of surface treatment of aluminum and aluminum alloys, and in particular relates to a method for electroplating environment-friendly chromium on aluminum and aluminum alloy parts. Background technique [0002] Aluminum and aluminum alloys have been widely used in industrial fields, especially in high-grade building materials, transportation, aerospace and High-end electronic products and so on. At present, it is difficult to achieve high corrosion resistance and high bonding force for products prepared by the existing aluminum and aluminum alloy electroplating process. [0003] In the production of sanitary parts, in order to achieve the purpose of improving the corrosion resistance, decorative performance and environmental protection of aluminum parts, in addition to surface treatment methods such as anodization and painting, it is also possible to choose aluminum parts decorative environmental protection chromium pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C23C18/54C23C18/38C23C18/32C25D3/06
CPCC23C28/025C23C18/54C23C18/38C23C18/32C25D3/06
Inventor 林孝发林孝山伍文彬刘小龙王汉春
Owner JOMOO KITCHEN & BATHROOM
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