In this work,the outdoor corrosion behavior of AZ31B magnesium alloy in the Antarctic atmospheric environment was investigated.The surface corrosion state of the specimens exposed to the Antarctic atmosphere for 1 mon...In this work,the outdoor corrosion behavior of AZ31B magnesium alloy in the Antarctic atmospheric environment was investigated.The surface corrosion state of the specimens exposed to the Antarctic atmosphere for 1 month and 24 months differ significantly.The corrosion rate after 1 month during the summer season was 19.82 g/m^(2)·year and it decreased to 13.87 g/m^(2)·year after two years’exposure.Corrosion is initiated with pitting corrosion and then evolved to uniform corrosion with prolonging exposure time.The skyward surface exhibited a much severe corrosion than that of the groundward surface,attributed to the long-term existence of the adsorbed electrolyte layer.The corrosion products formed on the alloy exposed in Antarctica environment were MgCO_(3)·3H_(2)O,MgCO_(3)·5H_(2)O and Mg_(2)CO_(3)(OH)_(2)·0.5H_(2)O,with the MgCO_(3)·3H_(2)O as the dominant phase in the initial stage and the Mg_(2)CO_(3)(OH)_(2)·0.5H_(2)O as the dominant phase after long-term exposure.展开更多
基金The authors acknowledgement the Excellent Youth Science Fund of Shandong Province(No.ZR2022YQ44)the Fundamental Research Funds for the Central Universities(No.201762008).
文摘In this work,the outdoor corrosion behavior of AZ31B magnesium alloy in the Antarctic atmospheric environment was investigated.The surface corrosion state of the specimens exposed to the Antarctic atmosphere for 1 month and 24 months differ significantly.The corrosion rate after 1 month during the summer season was 19.82 g/m^(2)·year and it decreased to 13.87 g/m^(2)·year after two years’exposure.Corrosion is initiated with pitting corrosion and then evolved to uniform corrosion with prolonging exposure time.The skyward surface exhibited a much severe corrosion than that of the groundward surface,attributed to the long-term existence of the adsorbed electrolyte layer.The corrosion products formed on the alloy exposed in Antarctica environment were MgCO_(3)·3H_(2)O,MgCO_(3)·5H_(2)O and Mg_(2)CO_(3)(OH)_(2)·0.5H_(2)O,with the MgCO_(3)·3H_(2)O as the dominant phase in the initial stage and the Mg_(2)CO_(3)(OH)_(2)·0.5H_(2)O as the dominant phase after long-term exposure.
