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| Effect of Adding Copper Ion on Corrosion of EH40 Steel in Natural Seawater |
| Received:January 29, 2021 Revised:February 26, 2021 |
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| DOI：10.7643/issn.1672-9242.2021.07.007 |
| KeyWord:seawater corrosion EH40 steel copper ion corrosion rate influence mechanism |
| Author | Institution |
| XU Ming |
Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China;University of Chinese Academy of Sciences, Beijing , China |
| WU Jia-jia |
Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China |
| ZHANG Dun |
Institute of Oceanology, Chinese Academy of Sciences, Qingdao , China;Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao , China |
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| Abstract: |
| The purpose of this paper is to study the effect of adding 1.5, 15 mmol/L copper ion in natural seawater on the corrosion rate, corrosion product appearance and composition of EH40 steel systematically and propose the influence mechanism. The corrosion experiment of natural seawater was carried out by coupon method in the laboratory for 4 weeks, and the samples were characterized regularly and seawater environmental parameters were detected. After 1.5, 15 mmol/L copper ions are added into seawater, the corrosion rate of EH40 steel is accelerated. Meanwhile, surface corrosion products are stratified and one copper layer appears. The addition of 1.5, 15 mmol/L copper ions promotes the corrosion of EH40 steel in seawater mainly through three mechanisms:the acidic corrosive environment formed by the hydrolysis of copper ions, the consumption of sample matrix by the replacement reaction between iron and cooper ions, and anodic dissolution of iron accelerated by Fe-Cu galvanic corrosion. |
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