cnc hobbing machine.Aluminum alloy die-casting parts want bright electroplating

　　At present, it is quite difficult to achieve bright surface treatment of aluminum alloy die-casting parts like zinc alloy die-casting parts. Now let's talk about why aluminum alloy die-casting parts are not easy to achieve glossy electroplating?

　　Aluminum and aluminum alloy metals are very reactive and easily react with oxygen to form an oxide film. Even if removed, the reaction will occur in a short period of time, which seriously affects the adhesion of the coating.

　　The electrode potential of aluminum is very negative, and when immersed in the electroplating solution, it is easy to react with the metal ions of the positive electrode, affecting the adhesion between the coatings.

　　Aluminum and aluminum alloys have a higher coefficient of expansion than other metals, so they are not suitable for electroplating within a range of large temperature changes. Different coefficients of expansion from other metals will cause significant attraction, resulting in weak bonding between coatings.

　　Aluminum alloy die castings have problems such as sand holes and pores, which are prone to bubbling and can also reduce the adhesion between the coating and the base metal.

　　Aluminum is a bimetallic metal that can dissolve in acids and bases, so it is unstable in both acidic and alkaline electroplating solutions.

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