Failure mechanisms and corrosion behavior of epoxy-based protective coatings prepared on 20# steel exposed to cooling water
文献类型：期刊论文
| 作者 | Ren, Kai2; Zhang, Jie2; Liu, Yangyang5; Hou, Qingle5; Zhang, Ruiyong2; Krishnamurthy, Mathivanan1,2; Zuo, Zeyu2,6; Zhao, Yunyan6; Yu, Zhenhua3,4 |
| 刊名 | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
 |
| 出版日期 | 2025-11-01 |
| 卷号 | 20期号:11页码:14 |
| 关键词 | Cooling water heat exchanger Organic coating Galvanic corrosion Coating damage |
| ISSN号 | 1452-3981 |
| DOI | 10.1016/j.ijoes.2025.101207 |
| 通讯作者 | Zhang, Jie(zhangjie@qdio.ac.cn) ; Zhang, Ruiyong(ruiyong.zhang@qdio.ac.cn) ; Yu, Zhenhua(yzhhgm607@163.com) |
| 英文摘要 | Protective organic coatings are essential for extending the service life and ensuring the safe, low-carbon operation of industrial circulating-cooling-water heat exchangers. Yet prolonged exposure to high-temperature recirculating water accelerates coating degradation and substrate corrosion, while the underlying galvanic mechanisms remain insufficiently understood. Here, we elucidate these mechanisms by immersing epoxy-coated 20# carbon steel in 40 degrees C cooling water for 40 days, focusing on localized coating damage with an anode-area ratio of 1:2 (small vs. large anode). During immersion, the coating thickness declined to 96.04 mu m and 93.12 mu m for the small-anode and large-anode specimens, respectively, while blister density surged by day 20-5.1 n cm-2 and 5.3 n cm-2. Substrate corrosion rates reached 1.143 mm a-1 (small anode) and 1.048 mm a-1 (large anode). The small anode exhibited a markedly stronger "small-anode effect," generating higher galvanic current density, deeper pits, and more severe localized attack. Corrosion followed a dynamic "film formation-breakdown-reformation" cycle in which iron-based products such as Fe2O3, beta-FeOOH, and Fe(OH)3 initially accelerated anodic dissolution, subsequently compacted to form a temporary barrier, and ultimately underwent delamination. By revealing how localized coating failure and galvanic coupling synergistically intensify corrosion and by clarifying the transient protective role of corrosion products, this study advances the fundamental understanding of galvanic corrosion kinetics and provides a mechanistic framework for designing next-generation coatings and predictive-maintenance strategies, thereby driving progress in corrosion science and engineering. |
| WOS关键词 | PASSIVE LAYERS ; FE/CR ALLOYS ; SURFACE ; DEGRADATION ; REACTIVITY ; PRODUCTS |
| 资助项目 | Major Basic Research Project of Natural Science Foundation of Shandong Province[ZR2023ZD31] ; National Natural Science Foundation of China[42076043] |
| WOS研究方向 | Electrochemistry |
| 语种 | 英语 |
| WOS记录号 | WOS:001597157000001 |
| 出版者 | ELSEVIER |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/203656]  |
| 专题 | 中国科学院海洋研究所 |
| 通讯作者 | Zhang, Jie; Zhang, Ruiyong; Yu, Zhenhua |
| 作者单位 | 1.Saveetha Univ, Saveetha Dent Coll & Hosp, SIMATS, Dept Biomat, Chennai 600077, India 2.Chinese Acad Sci, Inst Oceanol, State Key Lab Adv Marine Mat, Qingdao 266071, Peoples R China 3.Qingdao Municipal Ctr Dis Control & Prevent, Qingdao 266000, Peoples R China 4.Qingdao Inst Prevent Med, Qingdao 266000, Peoples R China 5.Wanhua Chem Grp Co, Yantai 264006, Peoples R China 6.Qingdao Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266042, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ren, Kai,Zhang, Jie,Liu, Yangyang,et al. Failure mechanisms and corrosion behavior of epoxy-based protective coatings prepared on 20# steel exposed to cooling water[J]. INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,2025,20(11):14. |
| APA | Ren, Kai.,Zhang, Jie.,Liu, Yangyang.,Hou, Qingle.,Zhang, Ruiyong.,...&Yu, Zhenhua.(2025).Failure mechanisms and corrosion behavior of epoxy-based protective coatings prepared on 20# steel exposed to cooling water.INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE,20(11),14. |
| MLA | Ren, Kai,et al."Failure mechanisms and corrosion behavior of epoxy-based protective coatings prepared on 20# steel exposed to cooling water".INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 20.11(2025):14. |
入库方式： OAI收割
来源：海洋研究所
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