Characterization of Ni-P/TiO2 MMC Coatings Prepared by Electroless Plating Process on Mg-Nd-Zn-Zr Magnesium Alloys

Xing Wu Guo; Shao Hua Wang; Hai Yan Yang; Li Ming Peng; Wen Jiang Ding

doi:10.4028/www.scientific.net/MSF.690.422

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HomeMaterials Science ForumMaterials Science Forum Vol. 690Characterization of Ni-P/TiO2 MMC Coatings...

Characterization of Ni-P/TiO₂ MMC Coatings Prepared by Electroless Plating Process on Mg-Nd-Zn-Zr Magnesium Alloys

Abstract:

Ni-P/TiO₂ metal matrix composite (MMC) coatings were prepared by electroless plating process combined with sol-gel technology on Mg-3.0Nd-2.0Zn-0.4Zr (wt.%, NZ30K) magnesium alloys. The reinforcement of TiO₂ nanoparticles was added into the solution of electroless plating in the form of transparent alcoholic sol. The microstructures and compositions of the prepared Ni-P/TiO₂ MMC coatings were investigated by Field Emission Scanning Electron Microscopy (FE-SEM). The phase composition of the coating was analyzed by X-ray diffraction (XRD) facilities. It was found that the TiO₂ nanoparticles were highly dispersed in the coating matrix. The microhardness of Ni-P/TiO₂ MMC coating was far higher than those of NZ30K substrate and Ni-P coating due to the incorporation of in-situ formed TiO₂ nanoparticles. Electrochemical measurements indicated that the corrosion resistance of Ni-P/TiO₂ MMC coatings was superior to NZ30K substrate but no obvious significant change could be seen compared to Ni-P coating.