Journal
CORROSION SCIENCE
Volume 192, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109842
Keywords
Magnesium alloy; Ca addition; Corrosion behavior; Secondary phase; Surface film
Funding
- National Natural Science Foundation of China [51979099, 51774109]
- Natural Science Foundation of Jiangsu Province of China [BK20191303]
- Postgraduate Research and Practice Innovation Program of Jiangsu Province [SJKY19_0459]
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AZ31 magnesium alloy was modified by Ca addition to improve microstructure. The corrosion resistance in artificial seawater significantly increased in AZ31-Ca alloys with refined microstructure. With the increase of Ca content, the dominant role in reducing corrosion rates gradually shifted from compact corrosion products film to corrosion barriers consisting of net-like (Mg, Al)(2)Ca phases.
The microstructure of AZ31 magnesium alloy was modified by Ca addition. AZ31-Ca alloys with refined microstructure exhibited significantly enhanced corrosion resistance in artificial seawater. AZ31-0.5Ca showed the lowest corrosion rate of 0.716 +/- 0.186 mm y(-1), which was about 7.4 times lower than that of AZ31 alloy (5.326 +/- 0.652 mm y(-1)). The dominant role in the reduced corrosion rates of AZ31-Ca alloys gradually changed from the compact corrosion products film containing Al2O3 and CaCO3 to the corrosion barriers consisting of net-like (Mg, Al)(2)Ca phases as the Ca content increased from 0.1 wt% to 1.5 wt%.
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