Corrosion resistance of two types of stainless steel reinforcements under the simulated seawater wetting-drying cycle attack

Abstract

In order to study the corrosion resistance of the stainless steel bars under marine environmental attack, simulated seawater drying and wetting test on the two types of the stainless steel bars (SSRs), 304 and 316L austenitic SSRs as well as S32304 and S32205 duplex SSRs, was carried out in the laboratory. Electrochemical monitoring of open-circuit potential, linear polarization and electrochemical impedance spectroscopy (EIS) was carried out via CS310H electrochemical potentiostat. Zview software was used to discuss the measured data. Results show that the Stern-Genry coefficient B of the ordinary carbon steel bar is about 20mV, while those values of the duplex SSRs and austenitic SSRs are in the range of 14∼16mV and 15∼17mV, respectively. For the above-listed reinforcement, better corrosion resistance is shown in the duplex SSRs with the best behaviour observed in S32304 duplex SSRs; the corrosion resistance of the austenitic SSRs 304 and 316L is good and similar, while poor corrosion resistance is shown in the ordinary carbon steel bar as expected.