▎ 摘　　要

NOVELTY - Preparing composite plating layer comprises taking composite plating solution as plating solution, carrying out electric brush plating on the surface of the substrate to obtain the composite plating layer and the composite plating solution comprises silver nitrate, graphene and carbon nano tube. The composite plating solution comprises: 10-50 g/l silver nitrate, 100-500 g/l potassium iodide, 10-50 g/l potassium carbonate, 0.1-0.6 g/l dispersant, 1-20 g/l graphene and 0.2-2 g/l carbon nano tube. The curing liquid comprises 20-35 g/l trisodium citrate, 110-145 g/l citric acid and 2-5 g/l nickel chloride. USE - The composite plating layer is useful in preparing electric contact material (claimed), namely outdoor high voltage isolating switch, static contact protection part, and electric contact. ADVANTAGE - The composite plating layer: has excellent anti-sulfur performance and anti-arc ablation performance.