M.Hassanzadeh, N.Larché, A.Allion-Maurer, R.Dewil, and B.Rossi,
“Experimental and Comparative Study of the Corrosion Behavior of Lean Duplex Stainless Steel in Seawater,”
Materials and Corrosion0 (2026): 1-25. https://doi.org/10.1002/maco.70159.
Abstract
This study investigates the localized corrosion resistance of lean duplex stainless steel S32202 (EN 1.4062) in natural seawater. Its performance is compared to that of austenitic stainless steel 316 L (EN 1.4404), standard duplex S32205 (EN 1.4462), and super duplex S32750 (EN 1.4410) stainless steels. Crevice and pitting corrosion tests are conducted following the ISO 18070:2015 and ASTM G150 standards, respectively. The results indicate that EN 1.4062 exhibits superior critical pitting temperature and higher crevice corrosion resistance compared with EN 1.4404. Under a severe combination of conditions: a 20°C water temperature, a gasket pressure of 20 N/mm2, and a surface roughness of Ra = 0.3 ± 0.1 μm, even the higher-grade EN 1.4462 and EN 1.4410 may be susceptible to crevice corrosion. These findings suggest that EN 1.4062 may be suitable for certain short-term seawater applications, either independently or in combination with corrosion protection strategies.