海水液滴铺展因子对碳钢表面电化学特性的影响

Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel

应用丝束电极技术(WBE)研究了海水液滴下碳钢表面的腐蚀行为。结果表明,随着腐蚀时间的延长液滴下阴阳极电流值逐渐下降,最终趋于稳定。比较了不同大小的海水液滴下碳钢表面的电流分布,发现液滴越小腐蚀越剧烈,且更易形成不对称的电化学区域。提出了液滴铺展因子的概念。研究发现,随着液滴铺展因子的增大平均电流密度呈指数增加,最大阳极电流密度和阳极电流密度标准偏差线性增加,腐蚀强度提高。

Corrosion behavior of carbon steel beneath seawater droplets was investigated by using the wire electrode technique(WBE). It was found that anodic and cathodic current decreased gradually with the increasing time, then eventually kept stable. Furthermore, the current distribution over the WBE surface beneath seawater droplets of different sizes was studied. Beneath a smaller droplet, the carbon steel was more easily to form an asymmetric electrochemical area. In addition, a concept of droplet spreadability was defined. The average current density increased exponentially with the increasing droplet spreadability, the maximum value and the standard deviation of the anodic current density increased linearly, at the same time, the corrosion intensity enhanced.