期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 634, 期 -, 页码 263-271出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.02.019
关键词
Corrosion; Magnesium alloy; Yttrium; Potential difference
资金
- National Natural Science Foundation of China [51101082]
- Natural Science Foundation of Inner Mongolia [2010BS0801]
- Science and Technology Research Project of Colleges and Universities of Inner Mongolia [NJ10071]
- Open-ends Foundation of State Key Laboratory for Corrosion Protection [SKLCP2012KF09]
Microstructure characterization of the AZ91 magnesium alloys with or without rare earth element yttrium (Y) has been revealed by SEM, EDS and EPMA. Some Y-rich phases can be found in the magnesium alloys with Y additions. The fraction of beta-Mg17Al12 phase obvious decreases and turns into granular distribution with the increase of Y addition instead of original wet distribution along grain boundaries. The results of the potentiodynamic polarization tests show that the corrosion resistance of AZ91 alloy is improved with appropriate Y additions. But an in-situ observation of 3D digital microscopy for the initial stage of corrosion of the magnesium alloy with 0.9%Y addition shows that Y-rich phases act as cathodic effect and the a phases in the vicinity of them acting as anode are corroded. So the additions of Y have a beneficial effect that can depress the overall corrosion of AZ91 alloy, whereas its harmful effect is related to Y-rich phases because they present the highest Volta potential difference from the adjacent matrix and they can drive galvanic corrosion. (C) 2015 Elsevier B.V. All rights reserved.
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