摘要
采用扫描电镜(SEM)及电化学噪声(EN)分析了Al-5Zn-0.03In-1Mg-0.05Ti-X合金腐蚀前后的金相结构、表面形态,探讨了合金初始活化过程。结果表明晶界上存在富AlZnMg及富AlZnMgIn两种偏析相,这些阳极第二相处诱发的孔蚀为合金初始活化的主要方式。对电化学噪声进行小波分解可以清晰地分辨合金表层第二相初始腐蚀的时间段。
Electrochemical noise analysis （EN） and SEM was used on the study of activation mechanism of Al- 5Zn-0.03In-1Mg-0.05Ti-X alloy. The results show that there are tow type segregated phases in the grain boundaries which are rich in AlZnMg or AlZnMgIn. The pitting caused by these segregated phases is the main way activating the surface of Al-Zn-In ally. Wavelet transform of EN of alloy in 3.5 % NaCl solution can clearly distinguish the detail of the initial corrosion process of segregation phases in the surface.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2009年第8期1361-1364,共4页
Journal of Functional Materials
基金
河南省科技创新杰出人才计划资助项目(094200510019)
河南省自然科学基金资助项目(092300410132)
