The present invention provides alloy plating solution and corresponding treating process for forming coating with high corrosion resistance, high hardness, high wear resistance and high erosion resistance. The present invention is used in hydraulic part production, and has the outstanding features of high plating speed, low material consumption, low power consumption and no pollution. The alloy plating solution is compounded through dissolving nickel sulfate, amino acetic acid, sodium hypophosphorite, graphite fluoride, boric acid, sodium saccharin, lead ion, ammonia water and sodium hydroxide in the weight ratio of 3 to 2.5 to 0.35 to 0.6 to 3 to 0.3 to 0.003 to 0.35 to 0.15 in pure water of 90 weight portions. During plating, the alloy plating solution is heated to 50-80 deg.c, and the plating time is determined based on thickness to be plated. |