Corrosion analysis of low alloy steel subjected to a simulated SO2-containing atmosphere
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Abstract
This article aims to analyze the corrosion process of low alloy steel exposed to a simulated SO2-containing atmosphere. In this study, the corrosion thickness loss was monitored to investigate the corrosion process of low alloy steel and then the linear fitting technique was then applied to obtain the kinetics of the corrosion process. Rust morphologies and rust constituents were examined using scanning electron microscopy (SEM) and x-ray diffraction (XRD). The results showed that corrosion process of low alloy steel exposed to the simulated SO2-containing atmosphere consists of two sub-processes: accelerating and decelerating process. The difference in rust morphologies and the rust phases between two sub-processes was obvious. The nonprotective rust with unstable rust constituents was found in the first sub-process. As the corrosion process proceeded, the rust became more stable and protective. The thick rust composed of the stable rust constituents formed on low alloy steel provided the retarding effect to the diffusion of sulphate ions and thereby decreasing the corrosion rate of this steel experiencing the simulated SO2-containing atmosphere. atmosphere.
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