▎ 摘　　要

NOVELTY - The utility model claims a protective layer structure for chemical nickel plating of aviation appliance fittings, comprising an aluminium alloy substrate, and a chemical deposition zinc layer, a pre-plating copper layer, a chemical nickel plating layer and a graphene sealing layer prepared from inside to outside on the aluminium metal substrate. The advantages of the utility model are as follows: the prepared coating structure has high corrosion resistance.