Effect of Heat Input on Intergranular Corrosion Resistance of Duplex Stainless Steel Clad Metals

Cladding is a process of depositing a thick layer of a metal surface to a carbon steel or low alloy steel base metal for the purpose of providing a corrosion-resistant surface when that surface is to be exposed to a corrosive environment. Clad metals are more prone to corrosion attacks as compared to base metals because they are compositionally and microstructurally in homogeneous. Claddings require a proper evaluation of their corrosion resistance in order to ensure that they are suitable for the desired applications. This paper focuses on an experimental study of duplex stainless steel cladding of low carbon structural steel deposited by flux cored arc welding process. In this research work, double-loop electrochemical potentiokinetic reactivation technique was employed to evaluate the intergranular corrosion resistance of the claddings. The effect of heat input on intergranular corrosion resistance is presented in graphical forms, which are very useful to control the corrosion resistance of the claddings.