Abstract
Effect of three kinds of RE ion (Y3+, Nd3+, La3+), which added separately in the Ni-P electroless deposition bath, on coating micro-structure and property such as microhardness, wear and corrosion resistance was investigated. Optimization of organization structure and property of coating attributed to RE-added was analysed by means of ICPM, XRD, SEM and micro-sclerometer, wear testing machine. The results show that the coating has still amorphous structure but higher of phosphorus content due to RE, which added in the bath can make coating grains smaller and more compact. At the same time, improved microhardness, wear and corrosion resistance of coating are observed with RE-added properly. The effect of Y3+ is most remarkable among three RE ions. When the concentration of Y3+ in the bath is 0.04g.L-1, the microhardness, wear loss and corrosion rate in 10% H2SO4 solution of coating is 606HV, 4.9572mg and 0.0064mg.cm-2.h-1, respectively.
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