▎ 摘　　要

NOVELTY - The utility model claims a high corrosion resistance coating structure of cast iron piece galvanized iron alloy, comprising a cast iron base body, and an acidic zinc-iron alloy plating layer, a basic zinc-iron alloy plating layer, a silane chromium-free passivation layer and a hydroxyl graphene sealing layer from inside to outside in turn on the cast iron base body. The utility model claims a high corrosion resistance coating structure of galvanized iron alloy of cast iron piece, according to GB/T 10125-2012 " artificial atmosphere corrosion test salt mist test " neutral salt mist test 480h, the plating surface without white corrosion object. The plating layer structure has good corrosion resistance, and overcomes the technical defect of bad aging resistance of the silane chromium-free passivation layer.