Study of molybdenum/lanthanum-based composite conversion coatings on AZ31 magnesium alloy |
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| Authors: | Lihui Yang Junqing LiCunguo Lin Milin ZhangJianhua Wu |
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| Institution: | a College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
b State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266071, China |
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| Abstract: | The molybdenum/lanthanum-based (Mo/La) composite conversion coating on AZ31 magnesium alloy was investigated and the corrosion resistance was evaluated as well. The morphology, composition and corrosion resistance of the coating were studied by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and potentiodynamic polarization analysis, respectively. The results revealed that the conversion coating consisted of spherical nodular particles, which was mainly composed of Mo, La, O and Mg. After conversion treatment the corrosion potential shifts about 500 mV positively, and the corrosion current density decreases two orders of magnitude. The corrosion resistance of AZ31 alloy is remarkably improved by Mo/La composite conversion coating. |
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| Keywords: | Magnesium alloy Molybdenum Lanthanum Conversion coating Corrosion resistance |
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