模拟污损生物附着对Zn-Al-Cd阳极腐蚀性能影响的研究  

Corrosion of Zn-Al-Cd Sacrificial Anode in Simulating Marine Fouling Organisms Environment

作　　者：孙彩霞[1,2] 张杰[2] 李文佐[1] 程建波[1] 段继周[2] 

机构地区：[1]烟台大学化学化工学院,山东烟台264005 [2]中国科学院海洋研究所海洋环境腐蚀与生物污损重点实验室,山东青岛266071

出　　处：《烟台大学学报（自然科学与工程版）》2014年第1期39-44,共6页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：国家自然科学基金资助项目(41006054);中国科学院知识创新工程重要方向项目(KZCX2-EW-205);吉林大学超分子结构与材料国家重点实验室开放课题资助项目(sklssm201216)

摘　　要：通过电化学阻抗(EIS)、扫描电镜(SEM)和模拟生物膜方法研究污损生物附着对Zn-Al-Cd牺牲阳极在海水中腐蚀行为的影响.电化学阻抗结果得出,在整个实验周期内,阳极试样的腐蚀速率顺序为:添加微量藤壶牡蛎粉末<<表面涂一薄层琼脂的阳极<空白阳极;SEM结果表明,只添加薄层琼脂的Zn-Al-Cd发生均匀腐蚀,而添加微量藤壶牡蛎粉末的阳极发生局部腐蚀.整个实验结果可以说明,阳极表面大型污损生物的致密覆盖使内外腐蚀介质的交换受到抑制,在一定程度影响了Zn-Al-Cd牺牲阳极的溶解释放,影响阴极保护效果.但另一方面,大型污损生物在阳极表面形成的致密层也有可能引起局部腐蚀的发生.The effects of marine fouling organisms on corrosion of Zn-A1-Cd sacrificial anode are investigated by u- sing electrochemical impedance spectroscopy （ EIS）, scanning electron microscopy （SEM） and artificial biofilm sim- ulation. The EIS results show that the corrosion rate of samples coated with oysters and barnacles powder is much smaller than samples coated only with agar. The results of SEM show that uniform corrosion occurs on the surface of Zn-A1-Cd samples coated with agar, while local corrosion occurs on the surface of samples coated with powder of barnacles and oysters. We conclude from the experiment that the existence of large fouling organisms inhibits the exchange of corrosion medium, and affects the cathodic protection efficiency. However, it perhaps can cause the lo- cal corrosion.

关 键 词：Zn-Al-Cd阳极 生物膜 阴极保护 电化学阻抗谱 

分 类 号：TG171[金属学及工艺—金属表面处理]