| abstract |
Provided are an overcoat paint having good anti-rust properties and adhesion properties, and a corrosion-resistant surface-treated chain and a corrosion-resistant surface-treated sprocket on which a coating film is formed using the overcoat paint so as to prevent the occurrence of coating film powder and to exhibit good corrosion resistance. A roller chain (10) is provided with inner plates (11), bushes (12), outer plates (13), connecting pins (14), and rollers (15). Each constituting part has a zinc-iron alloy undercoat film formed on an iron-based base material by impact zinc plating and a first coating film formed using an aqueous anti-rust paint containing zinc, nitrate, and an organic compound containing a mercapto group other than a mercapto group-containing silane coupling agent. Then, on the first coating film, a second coating film is formed using an overcoat paint containing a pigment, sodium silicate, and an acrylic emulsion or an aqueous polyurethane composition. |