Effect of surface Volta potential of Cr-containing steel on uniform corrosion and pitting corrosion,Materials and Corrosion

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Effect of surface Volta potential of Cr-containing steel on uniform corrosion and pitting corrosion
Materials and Corrosion ( IF 1.6 ) Pub Date : 2021-07-24 , DOI: 10.1002/maco.202112493
Rui Yuan ₁ , Yang Gu ₁ , Huibin Wu _{1,

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Affiliation

The corrosion behavior of 5.5%Cr–8.5%Cr steels in a CO₂ environment was studied. To clarify the effect of Volta potential on uniform corrosion and pitting corrosion, weight loss test, electrochemical measurement, scanning electron microscope, energy dispersive spectrometer, confocal laser scanning microscope, and scanning Kelvin probe force microscope were conducted. The results show that there is a linear relationship between the surface potential of the steel substrate and the self-corrosion potential. The increase of the Cr content reduces the surface potential and increases the self-corrosion potential, reducing the thermodynamic tendency of corrosion. The Al-oxide inclusions show lower potential than the substrate, and their sensitivity to pitting corrosion is affected by the potential difference with the substrate. The larger the potential difference, the easier it is tantamount to induce pitting corrosion.

中文翻译：

含铬钢表面伏特电位对均匀腐蚀和点蚀的影响

5.5%Cr~8.5%Cr钢在CO _{2 中}的腐蚀行为环境进行了研究。为了阐明Volta电位对均匀腐蚀和点蚀的影响，进行了失重试验、电化学测量、扫描电子显微镜、能谱仪、激光共聚焦扫描显微镜和扫描开尔文探针力显微镜。结果表明，钢基体表面电位与自腐蚀电位之间存在线性关系。Cr含量的增加降低了表面电位，增加了自腐蚀电位，降低了腐蚀的热力学趋势。氧化铝夹杂物的电位低于基体，其对点蚀的敏感性受与基体电位差的影响。电位差越大，

更新日期：2021-07-24

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