期刊
CORROSION SCIENCE
卷 199, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110205
关键词
Magnesium; AZ31-0.5Ca; Electron back-scattered diffraction; Potentiodynamic polarization; Electrochemical impedance spectroscopy
资金
- National Research Foundation (NRF) of South Korea [2020R1A2C1004720]
The effect of calcium on the microstructure and corrosion characteristics of AZ31 was investigated. It was found that the formation of (Mg, Al)(2)Ca in AZ31-0.5Ca contributed to improved corrosion resistance.
The effect of calcium on microstructure and corrosion characteristics of AZ31 was investigated. Electron probe microanalysis, scanning electron microscopy and electron back-scattered diffraction were employed for microstructural analysis. Corrosion behavior was characterized by open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy in NaCl at different pH levels. Microstructural observations confirmed the formation of (Mg,Al)(2)Ca in AZ31-0.5Ca. The corrosion rates were 84.21 mpy/ 31.71 mpy and 23.42 mpy/9.40 mpy for AZ31 and AZ31-0.5Ca at pH 6 and pH 11, respectively. Improved corrosion resistance was attributed to segregation of aluminum with calcium to form (Mg,Al)(2)Ca which reduced beta-Mg-17-Al-12 area fraction.
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