Susceptibility of Duplex Stainless Steels to Corrosion and Stress Corrosion Cracking in Pulping Liquors, 2007 Engineering, Pulping & Environmental Conference

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Different grades of duplex stainless steels (DSS) are being used in the pulp and paper industry due to their superior mechanical properties and corrosion resistance. Corrosion and stress corrosion cracking (SCC) susceptibility of duplex stainless steels (DSS) vary as a function of alloy composition, temperature and environmental parameters. Tests were carried out in different sulfide containing caustic environments (synthetic white liquor, black liquors) to evaluate the effect of alloy composition and microstructure on the corrosion and SCC susceptibility of DSS. The SCC susceptibility of DSSs was found to increase with increasing sulfide content in the pulping liquors. It was found that the percent solids in black liquor play a major role in the general corrosion resistance of these steels. Conditions, under which the passive film may be locally damaged, by mechanical or chemical factors, were found to result in accelerated corrosion of DSS in sulfide containing caustic solutions.