WBE技术研究水线区Q235碳钢腐蚀  

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

作　　者：陈亚林[1,2,3] 张伟 王伟[1] 王佳[1,4] 王琦[1] 蔡光旭[1] 

机构地区：[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

出　　处：《中国腐蚀与防护学报》2014年第5期451-458,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金项目(21203034)资助

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。The water-line area corrosion of carbon steel in 3.5%NaCl solution was studied by means 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.

关 键 词：水线腐蚀 阵列电极 金属腐蚀 电流分布 

分 类 号：O646[理学—物理化学]