Analysis and solution measures for the cause of gold bulging in aluminum alloy electroplating
The gold plating layer of aluminum alloy parts has bulging fault,and the scanning electron microscopy results showed that the location of bulging has intergranular corrosion morphology,along intergranular corrosion and surface penetration.The nickel layer infiltrates into the matrix along crystal cracks at local locations,and there is P element in the intergranular cracks.This indicates that intergran-ular corrosion has already existed before electroless nickel plating,and after gold electroplating,the intergranular corrosion area is covered by a coating.Therefore,during the binding force testing process,under the action of stress generated by intergranular corrosion,bulging phenomenon is observed at this location.After taking a series of rust prevention measures during mechanical processing and electroplating,the problem is solved.
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