| 摘要 |
PURPOSE:To easily identify a hub and to prevent corrosion of a metal part by coloring a resin part of a metal insert forming hub with a specific substance. CONSTITUTION:A hub 2 is subjected to metal insert forming a metal is made of a ferrite group SUS 430, a resin section 3 is made of a same polycarbonate PC as that of a disk 1, they are colored by an organic pigment and potassium nitrite is added by 0.5% as an inhibitor, then corrosion is suppressed and the occurrence of rust is slight. The difference depending on the specifications and lots of hubs is easily identified by varying the kind of the pigment and the corrosion of the metal of insert forming and the metal of resin insert is suppressed by the addition of the inhibitor or the like having rust prevention effect. |
