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材料研究学报  2015, Vol. 29 Issue (2): 95-100    DOI: 10.11901/1005.3093.2014.347
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海水液滴铺展因子对碳钢表面电化学特性的影响
续冉,王燕华(),王佳,刘在健,张源
中国海洋大学化学化工学院 海洋化学理论与工程技术教育部重点实验室 青岛 266100
Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel
Ran XU,Yanhua WANG(),Jia WANG,Zaijian LIU,Yuan ZHANG
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
引用本文:

续冉,王燕华,王佳,刘在健,张源. 海水液滴铺展因子对碳钢表面电化学特性的影响[J]. 材料研究学报, 2015, 29(2): 95-100.
Ran XU, Yanhua WANG, Jia WANG, Zaijian LIU, Yuan ZHANG. Influence of Spreadability of Seawater Droplet on Electrochemical Characteristics of Carbon Steel[J]. Chinese Journal of Materials Research, 2015, 29(2): 95-100.

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摘要: 

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。

关键词 材料失效与保护大气腐蚀丝束电极铺展因子    
Abstract

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.

Key wordsfailure and protection of material    atmospheric corrosion    wire beam electrode    spreadability
收稿日期: 2014-07-13     
基金资助:* 国家自然科学基金51131005, 40906039、山东省优秀中青年科学家奖励基金BS2012HZ021和山东省自然科学基金ZR2010DQ006资助项目。
图1  丝束电极表面实物图和实验装置示意图
图2  50 μL海水液滴下碳钢表面不同时间的电流分布图
图3  海水液滴下平均阳极电流密度随时间的变化曲线
图4  不同尺寸的海水液滴下碳钢表面的电流分布图
图5  铺展因子随海水液滴体积的变化曲线
图6  平均电流密度随铺展因子的变化曲线
图7  最大阳极电流密度随铺展因子的变化曲线
图8  阳极电流密度标准偏差随铺展因子的变化曲线
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