[China Aluminum Industry Network] Plating on aluminum and aluminum alloys is much more difficult and complicated than plating on metal materials such as steel and copper. The main reasons are the following.
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1. Aluminum and aluminum alloys have a high affinity for oxygen and easily generate oxide films. Once this layer of oxide film is removed, it will produce a new oxide film in a very short time, which will seriously affect the adhesion of the coating.
2. The electrode potential of aluminum is very negative, and when it is immersed in the plating solution, it is easily replaced with a metal ion having a positive potential, which affects the binding force of the coating.
3. The expansion coefficient of aluminum and aluminum alloys is larger than other metals, so it is not suitable to perform electroplating in the range where the temperature changes greatly. Different expansion coefficients of aluminum and aluminum alloys and other metal coatings will cause greater stress, so that the binding force between the coating and aluminum and aluminum alloys is not strong.
4, aluminum is amphoteric metal, soluble in acid and alkali, in acid and alkaline plating solution are not stable.
5, aluminum alloy die-casting sand holes, pores, will remain the bath and hydrogen, it is easy to bubbling, it will reduce the coating and the matrix metal binding force.
Reasons for difficult plating of aluminum alloys