Abstract
Samples of ultrafine-grained 304L stainless steel with an average grain size of(130±30) nm were prepared by using equal channel angular pressing(ECAP) technique after 6 passes with route Bc at 500℃.The electrochemical behaviors and the passive properties of the material in 0.05 mol/L H_22SO_4+0.25 mol/L Na_2SO_4 solution were examined by using polarization curves and Mott-Schottky analysis.As compared with the coarse-grained counterpart,the ultrafine-grained 304L stainless steel sample exhibits a lower corrosion potential(-505 mV) and a higher corrosion current density(11.7μA/cm~2),indicating the accelerated trend of the active dissolution,and has a broadening of passive region(-341-847 mV) with lower passive potential(-341 mV) and passivation current density(4.5μA/cm~2).Both of the passive films exhibit n-type semi-conductor behaviors at potentials ranging from 0 to 0.7 V.The ultrafine grains of 304L stainless steel are helpful in forming more stable passive films with the reduced donor density and the diffusion coefficient of the charge carrier.
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