20#钢/TA2偶对在流动海水中的电偶腐蚀行为研究

黄家乐; 邢少华; 刘近增; 徐铖; 曾鲜

doi:10.19554/j.cnki.1001-3563.2025.13.034

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包装工程（技术栏目） ›› 2025, Vol. 46 ›› Issue (13) : 304-312. DOI: 10.19554/j.cnki.1001-3563.2025.13.034

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20#钢/TA2偶对在流动海水中的电偶腐蚀行为研究

黄家乐^1,2, 邢少华^1,*, 刘近增¹, 徐铖¹, 曾鲜²

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Galvanic Corrosion Behavior of 20# Steel/TA2 Couple in Flowing Seawater

HUANG Jiale^1,2, XING Shaohua^1,*, LIU Jinzeng¹, XU Cheng¹, ZENG Xian²

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摘要

目的通过综合模拟管路平台研究20#钢/TA2偶对电偶腐蚀行为,为海水管路穿舱件腐蚀控制提供理论依据。方法通过电化学法测量偶对在不同流速海水中电偶电位和电偶电流密度,并利用扫描电镜、三维视频显微镜和X射线衍射分析偶对表面腐蚀产物形貌和成分,结合二者总结电偶腐蚀机理。结果在静态海水中,20#钢电偶腐蚀速率为0.171 mm/a;在流动海水中,由于溶解氧、Cl^-扩散速率增大,电偶腐蚀速率显著增加。在1~5 m/s流速海水中,20#钢/TA2电偶腐蚀速率增加20~30倍,且电偶腐蚀速率随着流速增加而增加。结论流动海水会显著提升20#钢与TA2偶对的电偶腐蚀速率,必须通过电绝缘技术避免二者形成电偶对或者采用阴极保护技术进行保护。

Abstract

The work aims to simulate the galvanic corrosion behavior of 20# steel/TA2 through the comprehensive simulation pipeline platform to provide a theoretical basis for the corrosion control of seawater pipeline through-hull components. The galvanic potential and current density of couples in seawater at different flow rates within a simulated pipeline platform were measured. Additionally, SEMm, 3DVM and XRD were employed to analyze the morphology and composition of corrosion products on the surface of the couples. By integrating these findings, the mechanisms underlying galvanic corrosion were explored. The results indicated that in static seawater, the galvanic corrosion rate of 20# steel was only 0.171 mm/a; In flowing seawater, the rate of galvanic corrosion significantly increased due to the enhanced diffusion rates of dissolved oxygen and Cl^-. In seawater with a flow rate ranging from 1 to 5 m/s, the galvanic corrosion rate of 20# steel/TA2 increased by 20 to 30 times, and the galvanic corrosion rate rose with the increase of the flow rate. Due to the significant increase in the galvanic corrosion rate between 20# steel and TA2 when exposed to flowing seawater, it is essential to employ electrical insulation techniques to prevent the formation of a galvanic couple between the two materials. Alternatively, cathodic protection methods can be utilized for safeguarding purposes.

导出引用

黄家乐, 邢少华, 刘近增, 徐铖, 曾鲜. 20#钢/TA2偶对在流动海水中的电偶腐蚀行为研究[J]. 包装工程（技术栏目）. 2025, 46(13): 304-312 https://doi.org/10.19554/j.cnki.1001-3563.2025.13.034

HUANG Jiale, XING Shaohua, LIU Jinzeng, XU Cheng, ZENG Xian. Galvanic Corrosion Behavior of 20# Steel/TA2 Couple in Flowing Seawater[J]. Packaging Engineering. 2025, 46(13): 304-312 https://doi.org/10.19554/j.cnki.1001-3563.2025.13.034

中图分类号： TG174

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