作　　者： ; ; ; ;

机构地区： 广东海洋大学

出　　处： 《中国腐蚀与防护学报》 2006年第5期282-285,共4页

摘　　要： 用扫描Kelvin探头和电化学极化等手段,研究了微液滴现象与大气腐蚀的电化学过程之间的相关性.扫描Kelvin探头测定主液滴周围的电位分布显示,微液滴只在表面的正电性区域出现;当有微液滴形成时,火山形电位分布的峰高且宽、谷深且窄;同时,峰变宽的速率与微液滴的扩展速率近似相等.电化学极化结果显示,微液滴的成核速率随极化电流的增加而线性加速,促使大气腐蚀过程发生的电位差和相应的腐蚀电流是微液滴形成和发展的推动力. Micro- droplets phenomenon has a close relation with the electrochemical process of atmospheric corrosion. A volcano pattern of potential distribution with a potential valley in the center of main- droplet and a potential annular peak in the area covered with micro- droplets was observed by scanning Kelvin probe. The electrochemical polarization results proved that the spreading rate of micro- droplets increased linearly with the polarization current, and the corrosion current established by the potential difference between the central and peripheral area of main- droplet was the true driving force for the formation and spreading of micro - droplets.

关 键 词： 微液滴现象 电位分布 腐蚀电流 电化学极化

领　　域： [金属学及工艺] [金属学及工艺]