Abstract

The effect of Cr content in steel on its passivation behavior in a CO2 aqueous environment containing silty sand was investigated. The results indicated that the stability of passive film was improved with increasing Cr content. High Fe3C content accelerated the rapid formation of a passive film as well as precipitates and dislocations. Increasing Cr content enhanced the contents of Cr2O3 and Cr(OH)3 in the passive film. Silty sand increased carrier densities of passive films, thereby reducing their protective effects. The role of the contents of Fe3C and Cr on corrosion mechanism of Cr steel with silty sand was emphasized.

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