Materials science and engineering a-structural materials properties microstructure and processing vol:174 issue:2 pages:L45-L49
So-called superpassivation surface treatment was conducted on a 22Cr-5Ni-3Mo-N duplex stainless steel, and its pitting and stress corrosion cracking (SCC) behaviour is studied in hot concentrated chloride solutions using cyclic polarization measurements and potential-controlled constant load tests. The results indicate that ''superpassivated'' steel has an excellent pitting resistance and - consequently - also a very good resistance to SCC since SCC of the duplex stainless steel initiates from pitting in the studied environments. Auger electron spectroscopy analyses show that the passivation treatment leads to a thick highly chromium-enriched passive film. Improved resistance of the duplex stainless steel to pitting and SCC is attributed to the existence of this him.