Electroless nickel plating was used to improve the weldability of diamond/Cu composites. Experiments were performed to study the influence of nickel plating process on the phosphorous content of Ni-P alloy coatings as well as the effects of phosphorous content on the bond strength between the coatings and diamond/Cu substrates,the corrosion resistance of the coatings and the spreading area of AgCu28 filler on the coatings. Besides, the coating thickness and process were optimized. It is found that AgCu28 fi...