Abstract
The rust layer plays an important role in the corrosion of TRIP steels in marine environments. In this paper, salt spray tests were conducted in laboratory for the specimens after two-stage heat treatment. The results have shown that the corrosion performance of steel B is higher than that of steel A. The corrosion products in rust layer were a complex mixture of α-FeOOH, γ-FeOOH, Fe3O4and γ-Fe2O3after the salt spray tests. The contents of α-FeOOH in rust layer are more than those of γ-FeOOH in steel B. Steel B exhibits compact rust layers. This is attributed to the fact that alloying elements such as Ni, Cr, Cu and Mo can enrich at the rust layer/substrate interface. Therefore, the corrosion performance of steel B was improved.
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