材料工程Issue(1)：58-63,6.DOI:10.3969/j.issn.1001-4381.2013.01.012
海水微生物对Zn-Al-Cd牺牲阳极腐蚀性能的影响
Effects of Microorganism on Corrosion of Zn-Al-Cd Sacrificial Anode in Natural Seawater
摘要
Abstract
The effects of the sterile seawater and natural seawater on corrosion of Zn-Al-Cd sacrificial anode were investigated by using electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and fluorescence microscopy. The results show that the corrosion potential of sample in the sterile seawater is lower than that in the natural seawater at the beginning of experiment, but at the late of experiment, the result is opposite. The EIS results show that the R-ct value in the sterile seawater is much smaller than that of anode in natural seawater, which is because in the natural seawater, a layer of biofilm through the metabolic activities of bacteria is formed on the sample surface. The biofilm could prevent the sample from contacting with seawater directly and slow down the corrosion rate. SEM images reveal the presence of localized corrosion morphologies on the sample in the sterile seawater, while in natural seawater, the corrosion is much uniform. Fluorescence microscopy results show that the bacteria uniformly attach to the sample first, and then reunite uneven. About fourteen days later, the local biofilm forms, and it detaches from the sample finally because of the exhaustion of nutrients.关键词
Zn-Al-Cd阳极/海水/电化学阻抗谱/荧光显微镜技术Key words
Zn-Al-Cd anode/ seawater/ EIS/ fluorescence microscopy分类
矿业与冶金引用本文复制引用
宋秀霞,张杰,杨东方,段继周..海水微生物对Zn-Al-Cd牺牲阳极腐蚀性能的影响[J].材料工程,2013,(1):58-63,6.基金项目
国家自然科学基金资助项目(41006054) （41006054）
中国科学院知识创新工程重要方向项目(KZCX2-EW-205) （KZCX2-EW-205）
