期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 639, 期 -, 页码 263-267出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.03.174
关键词
Al-Cu-Mg-Ag alloy; Intergranular corrosion; Precipitation free zones (PFZ); Self-corrosion potential
资金
- Natural Science Foundation of Hebei Province [E2013402056]
- Science and Technology Research Foundation of Hebei Education Department for Young Teachers in University [QN2014002]
- Science and Technology Research and Development Projects of Handan City [1321110085-4]
The effects of aging treatment on the corrosion behavior of Al-Cu-Mg-Ag alloy were studied by means of intergranular corrosion (IGC) testing, potentiodynamic polarization combined with optical microscopy (OM) and transmission electron microscopy (TEM). Corrosion testing results suggest that, the intergranular corrosion resistance properties of Al-Cu-Mg-Ag alloy decreased with increasing aging time, which is also corroborated by the potentiodynamic polarization test results for under-aged, peak-aged and the over-aged Al-Cu-Mg-Ag alloys. TEM results reveal that precipitations on the grain boundary became coarsened and distributed discontinuously with increasing aging time; widening of precipitation free zones (PFZ) is also observed. The PFZ with the lowest self-corrosion potential is preferentially attacked, and corrosion progresses along the PFZ. The corrosion resistance of over-aged Al-Cu-Mg-Ag alloy decreased because of its wider PFZ in comparison with those in other samples. (C) 2015 Elsevier B. V. All rights reserved.
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