Abstract
The corrosion process of low-alloy steels with three different microstructures in a humid atmosphere was systematically studied in this paper. Scanning electron microscope (SEM), transmission electron microscope (TEM), scanning Kelvin probe force microscope (SKPFM) and electrochemical measurement were conducted to characterize the microstructure, surface Volta potential and corrosion kinetic parameters of different phase. Confocal laser scanning microscope (CLSM) and X-ray diffraction (XRD) were utilized to characterize morphology and composition of rust layer. The results show that the volt potential of the substrate surface has a linear relationship with the corrosion kinetic parameters, and the structure with small micro-area potential difference and low average potential has better corrosion resistance. The ferrite in the dual phase will preferentially dissolve as an anode to form a crater, which will be filled with corrosion products, resulting in an uneven diffusion of oxygen and thus the formation of a concentration polarization. Dual phase steel will form a poorly protective rust layer, which causing the corrosion resistance analysis to be inconsistent with the final corrosion rate results.
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