Influences of Ce( NO_3)_3 and heat treatment on properties of electroless plating Ni-W-P alloy

Aimed at improving the anti-corrosion and wear resistance of electroless plating Ni-W-P alloy coatings,the influences of La( NO3)3and heat treatment on the deposition rate,porosity,weightless corrosion rate,corrosion potential,corrosion current,electrochemical impedance spectroscopy( EIS),micro-hardness and friction coefficient of electroless plating Ni-W-P alloy coating,were investigated by using heat treatment and electrochemical methods,etc. The results show that the high deposition rate( 36. 5 g/m2·h),low porosity( 0. 8 hole/cm2) and good anti-corrosion properties of electroless plating Ni-W-P are obtained,when 1. 0 wt% Ce( NO3)3is added into plating solution. The dense,uniform,defect-free,amorphous structure is the most important aspects to improve corrosion resistance of alloy coatings. By heat treatment at 100 ~ 600℃,the hardness and wear resistance of coatings are obviously improved. After being heat treated at 400℃,the micro-hardness of the alloy coating is as high as 1100 HV,which is 1. 8 times of the as-plated Ni-W-P alloy.