Roles of β phase in the corrosion process of AZ91D magnesium alloy |
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Authors: | Tao Zhang Fuhui Wang |
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Affiliation: | State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Wencui RD 62, Shenyang 110016, China |
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Abstract: | For better understanding of the roles of β phase in the corrosion processes of AZ91D alloy, corrosion behavior of a cast (α + β phase) and a homogenized (α phase) AZ91D alloy was investigated in NaCl aqueous solution by gas collection and electrochemical measurements. According to the hydrogen evolution properties during corrosion, two different types of corrosion tend might be differentiated. For type I, hydrogen diffused into alloy, which evoked the decreasing of hydrogen evolution rate (HER) and the weakening of negative difference effect (NDE). For type II, in the corrosion process, hydrogen in the alloys diffused into the product film (P-type semiconductor), which suggested that hydrogen entering the film would be ionized. The generated electrons during ionization decreased the concentration of vacancies in the valence band of the product films, indicating an improvement of corrosion resistance of AZ91D alloy. |
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Keywords: | Magnesium alloy β phase Effect of hydrogen Corrosion EIS |
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