Materials Transactions Online

Materials Transactions, Vol.50 No.05 (2009) pp.1214-1218
© 2009 The Japan Institute of Metals

Selective Dissolution Characteristics of 26Cr-7Ni-2.5Mo-3W Duplex Stainless Steel in H2SO4/HCl Mixed Solution

Heejoon Hwang, Gwanyong Lee, Soonhyeok Jeon and Yongsoo Park

Department of Metallurgical Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Korea

Selective dissolution of hyper duplex stainless steel was studied by potentiodynamic and potentiostatic test in various concentrations of H2SO4/HCl solutions at various temperatures. There were two peaks in the active-to-passive transition region in potentiodynamic test in 2 M H2SO4 + 0.5 M HCl solution at 60°C. In potentiostatic tests, the curve at -340 mV showed stable current density. As the potential increased, the current density increased and at above -310 mV potential, there was a much longer initial period of nonsteady current value. As the potential reached at -280 mV, the current density started to be stabilized and the current density was completely stabilized at -250 mV. It was found that a preferential dissolution of ferrite phase occurred at -330 mV and with the increase of potential, austenite phase was corroded at a high rate. On the other hand, both two phases were passivated at the potential above -270 mV, so that selective dissolution was absent.

(Received 2008/6/5; Accepted 2009/3/3; Published 2009/4/15)

Keywords: hyper duplex stainless steel, selective dissolution, potentiostatic test, active-to-passive transition

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