Abstract
In this work, effect of Sn microalloying on corrosion resistance of stainless steel and passive film characteristics were investigated by electrochemical and spectroscopy analyses. Meanwhile, a novel “dissolution-diffusion-deposition” model was developed to reveal the influence mechanism of Sn on passive film formation. Results indicated that Sn addition substantially accelerated heterogeneous nucleation of passive film, thus contributing to higher corrosion resistance of 0.1Sn steel. Nevertheless, severe hydrolysis of Sn2+ significantly reduced nucleation rate and crystal growth rate of passive film on 0.3Sn steel, thus deteriorating corrosion resistance. This work helps to understand the enhancement mechanism of microalloying elements on corrosion resistance.
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