Abstract: The effect of tensile stress on the critical pitting temperature (CPT) for 2205 duplex stainless steel (SS) was investigated using potentiostatic measurements. Potentiodynamic polarization, potentiostatic polarization, electrochemical impedance spectroscopy (EIS) were adopted to study the electrochemical corrosion behavior of 2205 duplex SS subjected to different tensile stresses at 40 ℃ and 60 ℃. The results confirmed the inverse correlation between CPT and tensile stress, with a singular point of 140 MPa, under which no pitting was observed even at 85 ℃. Potentiodynamic polarization, potentiostatic polarization and EIS indicated that below CPT the breakdown potential (Eb) and the stability of passive film declined with a tensile stress was exerted on the specimen. And moreover, the steel surface maintained in passive status during the potentiostatic polarization process. At a temperature above the CPT, stable pitting occured. With the increasing temperature, the decrease of Eb became more noticeable. The specimen which subjected to 140 MPa tensile stress underwent no pitting. This may be attributed to the crack-tip expansion and subsequent repassivation of the microcracks on surface of 2205 duplex SS under the effect of tensile stress and polarization. And in this circumstance, the electrochemical characteristic cannot denote its pitting corrosion resistance.
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2019, Vol. 33 
