Abstract
The influence of Cr on the initial corrosion behavior of low-alloy steels exposed to a CO2–O2–H2S–SO2 wet–dry corrosion environment was investigated using weight-loss measurements, scanning electron microscopy, N2 adsorption tests, X-ray diffraction analysis, and electrochemical impedance spectroscopy. The results show that the corrosion rate increases with increasing Cr content in samples subjected to corrosion for 21 d. However, the rust grain size decreases, its specific surface area increases, and it becomes more compact and denser with increasing Cr content, which indicates the enhanced protectivity of the rust. The results of charge transfer resistance (R ct) calculations indicate that higher Cr contents can accelerate the corrosion during the first 7 d and promote the formation of the enhanced protective inner rust after 14 d; the formed protective inner rust is responsible for the greater corrosion resistance during long-term exposure.
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Zhao, Qh., Liu, W., Zhao, J. et al. Influence of chromium on the initial corrosion behavior of low alloy steels in the CO2–O2–H2S–SO2 wet–dry corrosion environment of cargo oil tankers. Int J Miner Metall Mater 22, 829–841 (2015). https://doi.org/10.1007/s12613-015-1140-9
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DOI: https://doi.org/10.1007/s12613-015-1140-9