The effect of MnS inclusions with different sizes on the corrosion behavior of HRB400E re-bar steel in 2％NaCl solution was investigated by means of automatic inclusion analyzer,immersion tests and Electron Backscattered Diffraction.The in-situ immersion test results showed that the localized corro-sion was more easily induced by the relatively larger MnS inclusions than the smaller ones.The EBSD re-sults suggested that corrosion was more likely initiated by inclusions with size above 40 μm2,and this may be related to the presence of more low-angle grain boundaries and higher dislocation densities around them.Meanwhile,compared with the pit induced by a single inclusion,the width of pits initiated by clusters of large-size inclusions were greater.
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