Electroplating common sense - the main point of silver plating on aluminum
The most important thing for silver plating on aluminum is to solve the problem of bonding between the coating and the base metal, and special treatment must be taken. The following are the detailed points of silver plating:
1. Whether it is degreasing or alkaline washing, the content of NaOH should not be too high, and the time should not be too long, so as to avoid excessive corrosion on the surface.
2. The process of zinc immersion is the key to whether or not a satisfactory coating can be obtained. The zinc immersion is carried out twice because the zinc layer is rough after the first zinc immersion. After 1:1 HN0 is removed, the second zinc immersion is performed. After the second zinc immersion, only the zinc layer which is uniform, fine and has good adhesion to the substrate can be used to enter the next process.
3. Pay attention to the swing during the zinc immersion process to prevent the parts from overlapping each other and causing a local zinc-free layer.
4. If the quality of zinc immersion is found to be poor, use 1:1 HN0, and then re-soak the zinc.
5. After immersion in zinc, the parts should be charged with human tank when entering the cyanide copper plating solution, and then plated with high current for 2 minutes, then return to normal current. If the surface of the part is found to be black or dark during electroplating, the part can be taken out and treated before plating.
6. After the copper is plated with copper, it can be carried out according to the normal process of silver plating of copper parts.
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Label: Electroplating common sense - the main point of silver plating on aluminum
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