Study on the Galvanic Corrosion of AL-4%Zn Cast Alloys

The galvanic corrosion of aluminum alloy coupled with different materials,including Q_235 steel,zinc-coated iron plate,copper plate,was studied by free running test in 3.5% NaCl solution.In this study,galvanic current,corrosion potential and corrosion rate were measured.The results showed that: aluminum alloy was corroded serious in solution with chlorine ions;moreover,coupling material and area ratio of cathode to anode were important effects on the galvanic corrosion of aluminum alloy.