▎ 摘　　要

NOVELTY - Composite tritium barrier coating comprises base layer, substrate layer of graphene film, chromium oxide layer on the graphene film, where upper surface of the base layer is away from chromium oxide layer, and chromium oxide layer is formed on surface of the graphene thin film of aluminum phosphate layer. USE - Composite tritium barrier coating. ADVANTAGE - The composite tritium barrier coating is flat and compact, and improves the flame anti-tritium resistance of the coating. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing composite tritium barrier coating, which involves: (A) forming layer of graphene film on substrate layer; (B) forming chromium oxide layer on the surface of the base layer and away from graphene thin film; and (C) forming aluminum phosphate layer on the surface of the graphene film and away from chrome oxide layer to obtain composite tritium barrier coating.