Characterization of Ni-P/TiO2 MMC Coatings Prepared by Electroless Plating Process on Mg-Nd-Zn-Zr Magnesium Alloys
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.
Hajo Dieringa, Norbert Hort and Karl Ulrich Kainer
X. W. Guo et al., "Characterization of Ni-P/TiO2 MMC Coatings Prepared by Electroless Plating Process on Mg-Nd-Zn-Zr Magnesium Alloys", Materials Science Forum, Vol. 690, pp. 422-425, 2011