Effects of hydrogen on the corrosion of pure magnesium |
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| Authors: | Tao Zhang Yawei Shao Ying Li |
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| Affiliation: | a Corrosion and Protection Laboratory, Mechanics & Electronics Engineering Institute, Harbin Engineering University, Nantong ST 145, Harbin 150001, China
b 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: | Electrochemical measurements and capacitance measurements were performed for better understanding of the effects of hydrogen on the corrosion of pure magnesium. Anodic polarization curves, activation energy (Ea), pitting initiation time and electrochemical noise (EN) were carried out, which showed that hydrogen had a strong influence on the corrosion of magnesium. There existed a highest corrosion resistance of magnesium, when a series of cathodic charging current density were applied to the specimens due to the optimum hydrogen concentration in the hydride coating (MgH2) on the surface. Mott-Schottky results confirmed that there was a hydride coating on the charged magnesium. Hydrogen ionized as H− and depleted donor/electron, which induced the inversion of semi-conductivity from N-type to P-type. |
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| Keywords: | Magnesium Hydrogen Corrosion Electrochemical noise Mott-Schottky analysis |
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