Influence of chromium on the corrosion behaviour of stainless steels in sulphuric acid containing halide ions Available to Purchase

Introduction The passivation of iron in aqueous media has been investigated over a number of years. Bartlett and Stephenson and Froment et al. have given a deep insight into the processes of anodic depositon of FeSO4 on iron in H2SO4 solutions. Krstulonic et al. investigated the anodic passivation of Armco iron in a wide range of concentrations of suphuric avid. Alloy elements (Cr, Ni, Mo) are sometimes added to carbon steels to improve their mechanical properties and/or the effects of heat treatment. These metals can increase or decrease corrision resistance depending on the harshness of the environment. The most important alloy of stainless steel is chromium, which induces the formation of a good protective oxide film. According to the literature the alloy must contain at least 1.3 per cent chromium to form a stable passive film. The influence of chromium on the anodic dissolution of Fe‐Cr in sulphuric acid solutions has been the object of several investigations.