Research On Property Of Electroless Composite Coating Of Ni-P-Nanoparticles

In this paper, electroless composite coating of nanoparticles was prepared by chemical deposition. The best dispersion method of nanometer particles and pretreatment project of matrix was confirmed. TEM, SEM, XRD and DSC are employed to analyze the surface topography and structure of electroless composite coating with nanoparticles. The results show that a great number of nanoparticles are dispersed in the coating. With the temperature rise, the coating structure is turning into crystal from amorphous. The changing temperature of the composite coating of nanoparticles is higher than that of the coating without nanoparticles.MicrohardnessN electrochemical corrosion, electromagnetic shielding and photocatalysis are also studied here. The results indicate that with the incorporation of nanoparticles, the microhardness, which is correlative with the quantity and kind of nanoparticles, of electroless composite coating with nanoparticles was better than Ni-P alloy coating. By the analysis of Tafel curve, Electroless Composite Coating of TiO₂ Nanoparticles has good corrosion resistance in polluted water or in NaCl solution where when the addition quantity is 6g/L, the corrosion resistance is the best. The electromagnetic shielding, which is independent of the thickness of coating and rises slightly with the addition of nanoparticles, is good in the frequency range from 8 to 18 GHz. The photocatalysis properties reach the best when the addition quantities of TiO₂, SiO₂ and SiC nanoparticles are 4g/L, 10g/L and 4g/L respectively. Electroless composite coatings of different nanoparticles have different photocatalysis properties. The electroless composite coating of TiO₂ nanoparticles has the best photocatalysis property, and the electroless composite coating of SiC nanoparticles has the worst one.