▎ 摘　　要

NOVELTY - The utility model claims a zinc-nickel alloy plating layer without chromium passivation and coating structure of hydroxyl graphene cast iron base body, and a zinc-nickel alloy plating layer prepared from inside to outside sequentially the metal base body, a chromium-free passivation layer and a hydroxyl graphene sealing layer. The zinc-nickel alloy plating layer of the utility model has no chromium passivation and coating structure of hydroxyl graphene according to GB/T 10125-2012 " artificial atmosphere corrosion test salt fog test " for neutral salt fog test 720h, plating surface without white corrosion. The plating layer structure has good corrosion resistance, and overcomes the technical defect of bad aging resistance of the silane chromium-free passivation layer.