EFFECT OF PRE-ZINKING PROCESSES ON QUALITY OF ELECTROLESS NICKEL PLATING ON Si-CONTAINING Al-ALLOY

This paper describes the effect of pre-zinking processes on the quality of electroless nickel(EN) plating on a silicon-containing Al-alloy,by analyzing micromorophology,composition,thickness and corrosion resistance of zincate deposit,and the micromorphology,component,phase constituent,porosity,corrosion resistance and adhesion of EN plating as well.The results showed that zinking deposit was an important bridge connecting Si-containing aluminum alloy and EN plating.It was concluded that if there came to be a thin,well-distributed zinc on Si-contained aluminum alloy,the sequent EN deposit would be thin with good adhesion and high anti-corrosion performance.