Silver plating process for aluminum alloy of high-voltage electrical equipments

A process for plating silver on cast aluminum alloy ZL101 was introduced.The process flow mainly includes degreasing,descaling,pickling,zinc dipping,copper electroplating,silver electroplating,activating and coating protective film.Using a solution composed of 2 volumes of concentrated nitric acid,1 volume of water and a small amount of hydrofluoric acid,adding a home-made anti-bubbling powder to zinc bath,and removing gases from internal holes during electroplating are effective methods to eliminate the bubbling of deposits.