Review on pitting corrosion of steel induced by MnS inclusions
HU Jin-zhen1, REN Ying1, ZHANG Ji1, ZHANG Li-feng2
1. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. North China University of Technology, Beijing 100144, China
Abstract:The pitting corrosion of steel induced by MnS inclusions is extremely harmful to the service life of steel, safe production and socioeconomic development. Firstly, mechanisms of pitting corrosion for steel induced by MnS inclusions are analyzed, including the mechanism of galvanic corrosion, the synergistic mechanism of S and Cl-, the mechanism of accelerating pitting corrosion in closed area, the mechanism of Cr-depleted zone and the mechanism of micro-crevice. Secondly, the effects of MnS inclusions size, morphology, distribution, and chloride ion concentration, temperature and stress on pitting corrosion induced by MnS inclusions are summarized. Then, prevention measurements of the steel corrosion are summarized. Finally, the future research direction of preventing the pitting corrosion of steel induced by MnS inclusions is proposed.
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