| abstract |
An alloy film which suppresses the reaction of iron is formed on the surface, and the adhesion of the coating film formed on the alloy film is good, and the strength is strong and uniform. Therefore, after the assembly is not required to be repaired, Provide the chain to be maintained. The chain 10 has an inner plate 11, a bush 12, an outer plate 13, a connecting pin 14, and a roller 15. Each of the component parts includes a zinc-aluminum-magnesium alloy coating 17 formed by impact plating on an iron-based substrate and zinc and barium sulfate on the zinc-aluminum-magnesium alloy coating 17, and a urethane resin, And a coating film formed by curing at least one resin selected from the group consisting of a resin, an acrylic resin, and the like. |