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05-12-2022 | Technical Article
Optimizing the Corrosion Resistance of Ni-Containing Low-Alloy Steels with Mo Addition in Tropical Marine Atmosphere
Published in: Journal of Materials Engineering and Performance
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The corrosion behaviors of self-designed Ni-containing low-alloy steels with Mo addition in tropical marine atmosphere was investigated by surface analysis and electrochemical methods. The results showed that with the increase of Ni content, the weight gain rates of low-alloy steels gradually decreased and the composition phases of inner product films changed from γ-FeOOH to α-FeOOH. The synergistic effect of Ni and Mo on the corrosion resistance of low-alloy steel was related to the Ni content in the steel matrix. The corrosion resistance can be significantly improved by adding Mo when the Ni content was in the range of 1.72 to 2.87 wt.%. The enhanced synergistic effect of Ni and Mo could further promote the formation of more protective corrosion products, such as α-FeOOH, NiFe2O4 and Mo6+.