| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrosion resistant surface treated sprocket manufactured without having adverse effect on an environment, given corrosion treatment without degrading strength even when using an inexpensive material, providing a coating film with excellent adhesiveness and restrained from the formation of coating film powder during manufacture, use, or the like so as to excel in work efficiency, appearance quality and corrosion resistance. SOLUTION: The sprocket 10 includes tooth parts 11, 11 ... meshed with a roller of a roller chain, substantially at the center part in the thickness direction. A nickel-based coating is formed on an iron-based base material on the side faces of the tooth parts 11, and further a first coating film is formed using a water-based rust-proof coating material containing zinc, nitrate and an organic compound containing a mercapto group other than a silane coupling agent containing a mercapto group. A second coating film is formed on the first coating film, using a top coat containing a pigment, sodium silicate and acrylic emulsion. COPYRIGHT: (C)2011,JPO&INPIT
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