Effect of tensile elastic stress on the electrochemical passivation behaviour of cold-rolled 2205 duplex stainless steel

Abstract

The study investigates the effect of cold-rolling on the electrochemical behavior of 2205 stainless steel under tensile elastic stress (TES) using in-situ electrochemical measurements. The results reveal that TES accelerates the corrosion sensitivity of 2205 stainless steel, with the open-circuit-potential(OCP) first decreasing and then increasing as the degree of cold-rolling increases. For the 40 % cold-rolling sample under TES, the OCP decreases by 53 % compared to the unstressed state, showing the highest corrosion sensitivity. When the cold-rolling deformation reaches 70 %, the OCP decreases by 38 %, and the dislocation-cell-structure alleviates the elastic stress effect on the corrosion sensitivity of stainless steel.