Remanufacture of Zirconium-Based Conversion Coatings on the Surface of Magnesium Alloy
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Brush plating provides an effective method for creating a coating on substrates of various shapes. A corroded zirconium-based conversion coating was removed from the surface of a magnesium alloy and then replaced with new coatings prepared via brush plating. The structure and composition of the remanufactured coating were determined via x-ray photoelectron spectroscopy, x-ray diffraction, and Fourier transform infrared spectroscopy. The results revealed that the coatings consist of oxide, fluoride, and tannin-related organics. The composition of the coatings varied with the voltage. Furthermore, as revealed via potentiodynamic polarization spectroscopy, these coatings yielded a significant increase in the corrosion resistance of the magnesium alloy. The friction coefficient remained constant for almost 300s during wear resistance measurements performed under a 1-N load and dry sliding conditions, indicating that the remanufactured coatings provide effective inhibition to corrosion.
Keywordscorrosion failure remanufacture wear resistance zirconium-based conversion
This work was financially supported by the National Natural Science Foundation of China (Nos. 51575118, 51375106), National Basic Research Program of China (973 Program) (No. 61328303), China Postdoctoral Science Foundation (No. 2015M571390), Hei Long Jiang Postdoctoral Foundation (No. LBH-Z14050), Special Foundation for Harbin Science and Technology Innovation (No. 2015RAXXJ016) and Fundamental Research Funds for the Central Universities (No. HEUCFP2016154).
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