Self-healing hybrid coating of phytic acid/silane for improving the corrosion resistance of magnesium alloy |
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| Authors: | Yan Li Shu Cai Sibo Shen Guohua Xu Feiyang Zhang Fengwu Wang |
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| Affiliation: | 1.Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin,People’s Republic of China;2.Center for Electron Microscopy, Institute for New Energy Materials and Low-Carbon Technologies,Tianjin University of Technology,Tianjin,People’s Republic of China;3.Shanghai Changzheng Hospital,Shanghai,People’s Republic of China |
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| Abstract: | In order to improve the corrosion resistance of a biodegradable magnesium alloy, a series of phytic acid/3-aminopropyltrimethoxysilane (γ-APS) hybrid coatings was prepared on AZ31 magnesium alloys by dipping the magnesium alloy into the mixing solution of phytic acid and γ-APS. During the preparation of hybrid coatings, the pH values of the mixing solutions greatly affected the uniformity of the coatings and subsequently influenced their corrosion resistance. Electrochemical tests indicated that the hybrid coating prepared in the solution of pH = 8.0 could highly improve corrosion resistance of AZ31 magnesium alloys. Meanwhile, corrosion current density of the hybrid coating coated sample was significantly decreased from the uncoated sample of 138.1 ± 11.9 to 8.5 ± 0.8 μA cm?2. Immersion test in simulated body fluid revealed that the cracks on the surface of the hybrid coating gradually healed up during the lengthy immersion. |
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