Journal
CORROSION SCIENCE
Volume 127, Issue -, Pages 280-290Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2017.08.014
Keywords
Mg-Al-Ca alloys; EIS; Polarization; Weight loss; Passive films
Funding
- Key Laboratory of Superlight Materials & Surface Technology (Harbin Engineering University), Ministry of Education
- National Natural Science Foundation of China [51771128, 51201112, 51301120]
- Projects of international Cooperation in Shanxi [201703D421039]
- Natural Science Foundation of Shanxi [201601D011034, 2014021017-2]
- Shanxi Scholarship Council of China [2014-022]
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Effect of extrusion on the microstructures and corrosion properties of Mg-2Ca-chi Al (chi = 0, 2, 3, 5 wt.%) alloys were investigated in present work. Results showed that the precipitated phase changed from Mg2Ca and (Mg, Al)(2)Ca to Al2Ca with the increase of Al content. Corrosion results indicated that the addition of Al could improve the corrosion resistance of Mg by the formation of protective (Mg, Al)(2)Ca and Al2Ca. The as-cast alloys showed uniform corrosion mechanism while the as-extruded Mg-Al-Ca alloys presented local corrosion characteristic. Above different corrosion mechanisms were illustrated and analyzed.
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