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Aberration-corrected TEM study on the influence of HCO3−/ CO32− concentration and Cl− on FeCr15Ni15Mo2 alloy in alkaline solutions

Year: 2025
Type: article
Abstract: Carbonation of concrete pore solution results in a drop of pH value and introduction of HCO 3 − /CO 3 2− . The drop of pH has been identified as an important factor in causing general corrosion by destabilizing passive films on stainless steels. However, the effect of HCO 3 − /CO 3 2− concentration on the structure and composition of passive film and its interaction mechanism with Cl − are studied insufficiently due to the lack of direct experimental information at nano-meter/atomic scale. Here, by means of aberration-corrected transmission electron microscopy, we show that low concentration of HCO 3 − /CO 3 2− induces a relatively loose passive film; whereas high concentration of HCO 3 − /CO 3 2− induces a compact passive film behaving a superior pitting resistance. The concentration of HCO 3 − /CO 3 2− plays a significant role on the interaction manner of chloride ions with passive film on FeCr15Ni15Mo2 alloy.
DOI: 10.1016/j.jmrt.2025.04.142
Authors: Y.T. Xu, B. Zhang, X.X. Wei, Z.Y. Chen, X.L. Li, X.L. Ma
Institutions: University of Science and Technology of China, Chinese Academy of Sciences, Institute of Metal Research, Shenyang National Laboratory for Materials Science, Sun Yat-sen University, Tianjin University, Songshan Lake Materials Laboratory, Institute of Physics
Language: English
Open Access status: gold
Estimated APC paid: $1,640
OpenAlex ID: W4409413904
FWCI:
Cites: 62
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Related to: 10