Effect of a Small Amount of Cr and Mo on Aqueous CO_2 Corrosion of Low-Alloyed Steel and Formation of Protective FeCO_3 in Near-Saturation Conditions

Keiichi Kondo; Yoon-Seok Choi; Srdjan Nesic

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Effect of a Small Amount of Cr and Mo on Aqueous CO_2 Corrosion of Low-Alloyed Steel and Formation of Protective FeCO_3 in Near-Saturation Conditions

机译：Effect of a Small Amount of Cr and Mo on Aqueous CO_2 Corrosion of Low-Alloyed Steel and Formation of Protective FeCO_3 in Near-Saturation Conditions

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The effect of a small amount (1 wt%) of Cr or Mo on aqueous CO_2 corrosion of low-alloyed steel and the formation of protective FeCO_3 corrosion product layers was investigated under controlled water chemistry conditions, where the bulk saturation value of FeCO_3 was maintained at near-saturated condition. Changes in CO_2 corrosion rate with exposure time were monitored by linear polarization resisitance measurements. The surface morphology and the composition of the corrosion product layers were analyzed by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction, and transmission electron microscopy. Results showed that the emergence of a continuous Fe3C layer created favorable conditions at the surface of nonalloyed steel (containing no Cr and Mo) for semiprotective FeCO_3 to form even though the bulk saturation value of FeCO_3 was maintained at near-saturated condition. However, semiprotective FeCO_3 was not observed on the surface of 1% Cr steel and 1% Mo steel, but rather discontinuous and porous corrosion product layer was formed. Due to the hydrolysis reactions of Cr~（3+） and Mo~（3+） , and the discontinuous structure of the corrosion product layers, the surface conditions for 1% Cr steel and 1% Mo steel were not favorable for the formation of FeCO_3 under the experimental conditions of this study.

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《Corrosion: The Journal of Science and Engineering》 |2023年第1期|97-110|共14页
作者
Keiichi Kondo; Yoon-Seok Choi; Srdjan Nesic;
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作者单位

Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, Athens, Ohio 45701.;

Current af?liation: NIPPON STEEL CORPORATION, 1850, Minato, Wakayama, 640-8555, Japan.;

Institute for Corrosion and Multiphase Technology, Department of Chemical & Biomolecular Engineering, Ohio University, Athens, Ohio 45701.;

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原文格式 PDF
正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
alloy elements; carbon steel; CO_2 corrosion; iron carbonate;

Effect of a Small Amount of Cr and Mo on Aqueous CO_2 Corrosion of Low-Alloyed Steel and Formation of Protective FeCO_3 in Near-Saturation Conditions

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