The corrosion behavior of duplex stainless steel (DSS, Fe - 22%Cr - 9%Ni - 3%Mo) alloy aftervarying exposure periods in 10% H2SO4 solution was investigated. The influences of minor Ruadditions, namely, 0.14%, 0.22%, and 0.28%, on the passivation of this DSS were also reported. Thestudy was performed using open-circuit potential, potentiodynamic polarization, potentiostatic current- time, electrochemical impedance spectroscopy, and weight loss measurements. Electrochemicalmeasurements indicated that the presence of Ru passivated the DSS alloy by decreasing its corrosionparameters. This effect remarkably increased with increasing the Ru content as well as the immersiontime of DSS in the chloride solution before measurements. Weight-loss time data after varied exposureintervals (24 € 168 h) confirmed the electrochemical ones and showed that the weight-loss andcorrosion rate of DSS significantly decreased in the presence of Ru and the increase of its content inthe DSS alloy.
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