WBE技术研究水线区Q235碳钢腐蚀

doi:10.11902/1005.4537.2013.247

中国腐蚀与防护学报

2014, Vol. 34

Issue (5): 451-458 DOI: 10.11902/1005.4537.2013.247

本期目录 | 过刊浏览

WBE技术研究水线区Q235碳钢腐蚀

陈亚林^1,^2,³, 张伟^2,³(

), 王伟¹, 王佳^1,⁴, 王琦¹, 蔡光旭¹

1. 中国海洋大学化学化工学院青岛 266100
2. 青岛海洋腐蚀研究所青岛 266071
3. 青岛钢研纳克检测防护技术有限公司青岛 266071
4. 中国科学院金属研究所金属腐蚀与防护国家重点实验室沈阳 110016

Evaluation of Water-line Area Corrosion for Q235 Steel by WBE Technique

CHEN Yalin^1,^2,³, ZHANG Wei^2,³(

), WANG Wei¹, WANG Jia^1,⁴, WANG Qi¹, CAI Guangxu¹

1. College of Chemistry and Chemical Engineering,Ocean University of China, Qingdao 266100, China
2. Qingdao Institute of Marine Corrosion, Qingdao 266071, China
3. NCS Testing Technology Co., Ltd, Qingdao 266071, China
4. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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摘要:

应用阵列电极技术研究了Q235碳钢在3.5%NaCl溶液中的电流分布,并根据电流分布变化过程探究了腐蚀机理。结果表明,浸泡起始阶段,自水线向下,阳极电流呈逐渐增大趋势,表现出宏观氧浓差电池的特征,但此时阴极与阳极电流交叉分布。水线腐蚀发展阶段,形成了以水线附近为阴极,水线下为阳极的氧浓差电池。水线上阴极反应速率的不断增加,推动水线下金属腐蚀由水线下逐渐向水线处扩展,加速了整个金属的腐蚀反应速率。水线腐蚀稳定阶段,水线上成为电极表面主要的阴极反应区域,腐蚀速率处于稳定状态。阵列电极测量技术可以提供整个水线区的电流分布及其变化信息,弥补了传统片状电极的不足,为水线腐蚀研究提供了有效的技术手段。

关键词 ：水线腐蚀, 阵列电极, 金属腐蚀, 电流分布

Abstract：

The water-line area corrosion of carbon steel in 3.5%NaCl solution was studied by me- ans of wire beam electrode (WBE) technique. The corrosion current distribution was regularly measured over a period of 40 d. In the initial stage, it was found that, down from the waterline, the anodic current increased gradually. This indicated that an oxygen concentration cell had been formed already. But the cathode region and anode region were mixed up in this stage. With the progress of the corrosion process, the cathode region was located near the waterline and the anode region was located beneath the cathode region. As the cathodic reaction above the waterline was speeding up, the corrosion region extended from the lower portion of the electrode upward to the waterline and thus the corrosion rate of whole electrode increased. In the smooth stage of corrosion, the main cathode region was located above the waterline and the corrosion rate became stable. This work confirms the applicability of the WBE method for the study of water-line corrosion. This method can especially provide information concerning the evolution of the corrosion current distribution of the electrode, which can not be acquired by the traditional technique with a bulk electrode of long steel strip.

Key words： water-line corrosion wire beam electrode corrosion of metal current distribution

ZTFLH:

O646

基金资助:国家自然科学基金项目 (21203034) 资助

作者简介: null

陈亚林，男，1988年生，硕士生，研究方向为腐蚀电化学

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引用本文:

陈亚林, 张伟, 王伟, 王佳, 王琦, 蔡光旭. WBE技术研究水线区Q235碳钢腐蚀[J]. 中国腐蚀与防护学报, 2014, 34(5): 451-458.
Yalin CHEN, Wei ZHANG, Wei WANG, Jia WANG, Qi WANG, Guangxu CAI. Evaluation of Water-line Area Corrosion for Q235 Steel by WBE Technique. Journal of Chinese Society for Corrosion and protection, 2014, 34(5): 451-458.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.247 或 https://www.jcscp.org/CN/Y2014/V34/I5/451

图1 WBE表面照片和水线附近剖面示意图

图2 浸泡不同时间WBE表面电流密度的分布图

图3 浸泡不同时间单行电流密度矢量和

图4 电极表面阳极电流密度随浸泡时间的变化

图5 浸泡不同时间WBE表面的腐蚀形貌

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