| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a washer where, when a nut fitted with a washer is rotated, the nut is inserted into a hole in a member, it is screwed with a bolt, and, the member is fastened, the co-rotation of the washer inserted into the nut together with the nut is prevented. Ž<P>SOLUTION: The washer 90 is formed by: a metal plate 9 as the stock for a washer; a galvanizing layer 14 formed at the metal plate 9 as the stock for the washer by a zincate bath comprising a brightening agent; and a chromating layer 13, formed in the galvanizing layer 14, by a trivalent chromic acid solution uniformly suspended with silica particles 11. The silica particles 11 are uniformly distributed into the chromating layer 13 and are stuck thereto owing to excellent reactivity between the brightening agent and the trivalent chromic acid solution. By the screwing of a nut 10 fitted with the washer 90 and a bolt 17, the silica particles 11 bite in a member 7 (coating face 12), and the silica particles 11 are pulverized between the washer 90 and the nut 10, so as to prevent the co-rotation of the nut 10 and the washer 90. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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