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
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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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