Corrosion Evolution of Low Alloy Steel in Deaerated Bicarbonate Solutions
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第10期
论文作者：Yunfei Lu Junhua Dong Wei Ke
文章页码：1047 - 1058
摘 要：Corrosion evolution during immersion tests（up to 43 days） of Ni Cu steel in deaerated 0.1 mol/L bicarbonate solutions was investigated by electrochemical measurements, scanning electron microscopy（SEM） and X-ray diffraction（XRD）. Results show that Ni Cu steel transformed from the anodic dissolution in the early stage of immersion to a metastable passive state in the final stage as the open-circuit potential value shifted positively, which was aroused by the precipitation of corrosion products. This process was mainly promoted by the trace amount of oxygen. Simultaneously, dominant cathodic reaction transformed from the hydrogen evolution in early stage to reduction processes of corrosion products in later stages. Possible corrosion processes were discussed with the assistance of a corresponding Pourbaix diagram.
Yunfei Lu，Junhua Dong，Wei Ke
Institute of Metal Research,Chinese Academy of Sciences
摘 要：Corrosion evolution during immersion tests（up to 43 days） of Ni Cu steel in deaerated 0.1 mol/L bicarbonate solutions was investigated by electrochemical measurements, scanning electron microscopy（SEM） and X-ray diffraction（XRD）. Results show that Ni Cu steel transformed from the anodic dissolution in the early stage of immersion to a metastable passive state in the final stage as the open-circuit potential value shifted positively, which was aroused by the precipitation of corrosion products. This process was mainly promoted by the trace amount of oxygen. Simultaneously, dominant cathodic reaction transformed from the hydrogen evolution in early stage to reduction processes of corrosion products in later stages. Possible corrosion processes were discussed with the assistance of a corresponding Pourbaix diagram.
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