Pitting Corrosion Behavior in Laser Weld Metals of 2205 DSS with Continuous Heat Treatment

Abstract

Pitting corrosion behavior in laser weld metals of 2205 DSS with continuous heat treatment was investigated by cyclic polarization tests in a 3.5%NaCl solution at room temperature. The results indicated their excellent pitting corrosion resistances in this chloride solution and wide passive regions were observed for all the welds tested. The results demonstrated that laser continuous heat treatment can decrease the problems such as excessive ferrite and intermetallic phases by controlling secondary austenite microstructure. The effects of varying higher heat input on microstructure, mechanical properties and pitting corrosion resistance also were discussed.