MODIFICATION RESEARCH ON THE INFLUENCE ON CORROSION FILM PROPERTIES OF Pb-Ca-Sn ALLOYS OFWITH ADDITION OF Bi, Ag and Zn

The influences of addition of Bi, Ag and Zn on the electrochemical corrosion film properties of Pb-Ca-Sn(Ca=0.08%, Ca=1.2%) alloys were studied in this paper. The electrochemical properties of corrosion film were investigated by XRD, SEM, Tafel curve test and cyclic voltammetry (CV) test, respectively when the Pb-Ca-Sn alloys were in 1.28 g/mL of H2SO4 solution. The results show that effects of different elements on the electrochemical corrosion film properties of Pb-Ca-Sn alloys are different and obvious. More specific, the corrosion film becomes thicker and the crystal particles are bigger when Bi is added, and the corrosion product is mainly PbO; However, the corrosion film becomes thinner and crystal particles are smaller when Ag and Zn are added, and the corrosion product is mainly PbO2.