腐蚀
合金
材料科学
冶金
微观结构
氧化物
阴极保护
晶界
镁合金
X射线光电子能谱
电化学
硫酸盐还原菌
硫酸盐
化学工程
化学
电极
物理化学
工程类
作者
Yaohui Liu,Qiang Wang,Yulai Song,Dawei Zhang,Sirong Yu,Xianyong Zhu
标识
DOI:10.1016/j.jallcom.2008.06.092
摘要
The corrosion behavior of AZ91Ce alloy in the presence of sulfate-reducing bacteria (SRB) was investigated using a specially designed in-situ corrosion method. For comparison, AZ91 alloy was also studied under the same corrosion condition. It seemed that AZ91Ce alloy was susceptible to crystal boundary corrosion under SRB condition to some extent. A possible mechanism for the crystal boundary corrosion was proposed. The microstructure and corrosion morphologies of alloys were analyzed by optical microscope and SEM, and the corrosion products were detected by X-ray photoelectron spectrometer (XPS). The analysis results showed that Ce in AZ91 alloy can reduce the grain size, and impede the formation of oxide, and thereby improved the corrosion performance. The electrochemical test revealed that the formation of Ce compound can restrict the cathodic reaction, and thus improve the corrosion resistance significantly as observed under the sterile condition. However, it appeared that the improvement was unconspicuous in the presence of SRB.
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