Aberration-corrected TEM study on the influence of HCO3−/ CO32− concentration and Cl− on FeCr15Ni15Mo2 alloy in alkaline solutions
Carbonation of concrete pore solution results in a drop of pH value and introduction of HCO3−/CO32−. 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 HCO3−/CO32− concentration on the stru...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425009639 |
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| Summary: | Carbonation of concrete pore solution results in a drop of pH value and introduction of HCO3−/CO32−. 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 HCO3−/CO32− 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 HCO3−/CO32− induces a relatively loose passive film; whereas high concentration of HCO3−/CO32− induces a compact passive film behaving a superior pitting resistance. The concentration of HCO3−/CO32− plays a significant role on the interaction manner of chloride ions with passive film on FeCr15Ni15Mo2 alloy. |
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| ISSN: | 2238-7854 |