Abstract
Pitting corrosion behavior of dual phase steel triggered by Al2O3-MnS complex inclusion in NaCl solution was investigated. Results indicated that neither micro-defects nor strain fields existed around the insulating Al2O3-MnS inclusion, but an open circular pit was immediately initiated around the inclusion and grew in diameter approaching 200 μm in several minutes. The preferential dissolution of unstable MnS part created local acidic electrolytes promoting the dissolution of Al2O3 part and adjacent matrix. The radial diffusion and hydrolysis of Al3+ acidified the pit solution, resulting in the propagation of circular pit. Finally, the pitting propagation decelerated with the depletion of inclusion.
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