Patent ID: 10655203

Abstract:
An average chemical composition of a plating layer (10) and an intermetallic compound layer (30) is represented by, in terms of mass %, Al: 10% to 40%, Si: 0.05% to 4%, Mg: 0% to 5%, and the balance: Zn and impurities. The plating layer (10) includes a first structure (11) constituted from Al phases containing Zn in solid solution and Zn phases dispersed in the Al phases and having an average chemical composition represented by, in terms of mass %, Al: 25% to 50%, Zn: 50% to 75%, and impurities: less than 2%, and a eutectoid structure (14) constituted from Al phases and Zn phases and having an average chemical composition represented by, in terms of mass %, Al: 10% to 24%, Zn: 76% to 90%, and impurities: less than 2%. In a cross section of the plating layer (10), an area fraction of the first structure (11) is 5% to 40% and a total area fraction of the first structure (11) and the eutectoid structure (14) is 50% or more, an area fraction of Zn phases (15) which are structures containing 90% or more of Zn, contained in the plating layer (10) is 25% or less, a total area fraction of intermetallic compound phases contained in the plating layer (10) is 9% or less, and a thickness of the intermetallic compound layer (30) is 2 μm or less.