期刊
CORROSION SCIENCE
卷 52, 期 2, 页码 345-351出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.09.020
关键词
Magnesium; Polarization; Weight loss; Pitting corrosion
资金
- National Natural Science Foundation, PR China
- Science and Technology Project of Taiyuan City [08121018]
- Ministry of Education of China
- Shanxi Province Foundation for Returned Scholars
- Shanxi Province Young Subject-Leader Foundation
The corrosion behaviour of die-cast AZ91D magnesium alloys in sulphate solutions was investigated by SEM, FTIR and polarization measurements. For immersion times less than 48 h, no pitting corrosion occurred and only generalized corrosion was apparent. According to the polarization curves, the corrosion rate order of the die-cast AZ91D Mg alloy in three aqueous solutions was: NaCl > MgSO4 > Na2SO4. The main corrosion products were Mg(OH)(2) and MgAl2(SO4)(4)center dot 22H(2)O in the sulphate solutions and the product film was compact. Precipitation of MgAl2(SO4)(4)center dot 22H(2)O required a threshold immersion time. (c) 2009 Elsevier Ltd. All rights reserved.
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