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This article with electroless plating method to obtain the amorphous nickel and tin - p alloy coating. By SEM, EDS, AAS, XRD and electrochemical analyzer, nickel chloride, tin tetrachloride, lactic acid, sodium citrate, reductant content, pH and temperature on the surface morphology of electroless plating nickel and tin alloy, coating composition, the influence of the plating rate and coating structure. Through the single factor investigation, selected the process conditions of high tin content, pH value of 5.5, the reductant, 40 g/L, nickel salt, 20 g/L, 20 g/L tin salt, temperature 90 ℃, complexing agent of 140 g/L, can get the tin content is 28.3% of amorphous nickel and tin - p alloy coating. Results show that the laboratory development solution plating speed fast, and the obtained coating has good corrosion resistance, high weldability, antioxidant effect is good, can effectively prevent the gold leaching process "LiJie corrosion" and "black pad", can be widely used in PCB industry, can also be used for decorative coating.
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