Abstract
The corrosion behavior of 5wt%Cr steel tempered at different temperatures was investigated by immersion testing and electrochemical testing in a CO2 aqueous environment. When the tempering temperature exceeded 500°C, the corrosion rate increased. The corrosion layers consisted of Cr-rich compounds, which affected the corrosion behaviors of the steels immersed in the corrosive solution. The results of electrochemical experiments demonstrated that 5wt%Cr steels with different microstructures exhibited pre-passivation characteristics that decreased their corrosion rate. Analysis by electron back-scattered diffraction showed that the frequency of high-angle grain boundaries (HAGBs) and the corrosion rate were well-correlated in specimens tempered at different temperatures. The corrosion rate increased with increasing HAGB frequency.
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This work was financially supported by the National Key R & D Program of China (No. 2017YFB0304900) and the National Science and Technology Major Project of China (No. 2014E-3604).
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Wu, Hb., Wu, T., Niu, G. et al. Effect of the frequency of high-angle grain boundaries on the corrosion performance of 5wt%Cr steel in a CO2 aqueous environment. Int J Miner Metall Mater 25, 315–324 (2018). https://doi.org/10.1007/s12613-018-1575-x
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DOI: https://doi.org/10.1007/s12613-018-1575-x