期刊
APPLIED SURFACE SCIENCE
卷 462, 期 -, 页码 243-254出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.08.107
关键词
Magnesium alloy; T phase; Corrosion; Electrochemical; SKPFM
类别
资金
- National Key Research and Development Program of China [2016YFB0700300]
A complete understanding of the role of Mg-Zn-Nd (T) phase in surface micro-galvanic corrosion of Mg alloys has not been fully developed. Therefore, the microstructure evolution and corrosion behavior in simulated body fluid (SBF) of Mg-2Zn-0.6Zr-xNd alloys (x = 0, 0.2, 0.6 and 1 wt%) were investigated. It was found that the MgZn phase in Mg-2Zn-0.6Zr alloy changed to Mg60Zn32Nd8 (T-2) and Mg35Zn40Nd25 (T-3) phases after adding 0.2-1 wt% Nd. With the formation of T phases, the grain size increased first and then decreased. By using scanning kelvin probe force microscopy (SKPFM), the Volta potentials of second phases relative to Mg matrix were measured. T-2 and T-3 phases with a relative Volta potential of about -400 mV acted as micro-anodes, so that they were corroded preferentially during the corrosion process. Because of the appropriate amount of anodic T phases and their discontinuous distribution, the alloy with 0.2 wt% Nd addition showed a uniform surface corrosion characteristic and exhibit the best corrosion resistance.
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