▎ 摘　　要

NOVELTY - The utility model claims a galvanized and hydroxyl graphene sealed coating structure of cast iron piece, comprising a cast iron piece base body, and an acidic zinc plating layer, a basic zinc plating layer, a trivalent chromium passivation layer and a nano graphene sealing layer, which are orderly prepared from inside to outside on the cast iron piece base body. The utility model claims a galvanized and hydroxyl graphene sealed coating structure of cast iron piece, according to GB/T 10125-2012 artificial atmosphere corrosion test salt mist test for neutral salt mist test for 276 hours, plating surface without white corrosion object, has good corrosion resistance.