Effects of Weld Materials on Galvanic Corrosion Behavior of Hot-Dip Aluminized Steel in Seawater

Abstract

In order to investigate the influence of weld metals, i.e., LB 26, NB3N and NC 39, on the corrosion rate of the hot-dip aluminized steel in Seawater, the immersion tests of galvanic couples in artificial seawater were made. The galvanic couples consist of three specimens, i.e., carbon steel, Fe-Al alloy and weld metals, which are connected each other by lead wires.
It was found that the corrosion rate of carbon steel coupled to NC 39 was less than that of carbon steels coupled to NB 3 N or LB 26. Under galvanic coupling condition with LB 26, LB 26 and carbon steel suffered from corrosion, while Fe-Al alloy did not corrode.