COMPOSITE OF METAL ALLOY WITH POLYAMIDE RESIN COMPOSITION AND PROCESS FOR PRODUCING THE SAME

摘要

Provided are: a composite obtained by tenaciously bonding a metal alloy to a molded article of an aliphatic polyamide resin; and a process for producing the composite.  (1) A surface of a metal alloy is caused to have a micrometer-order roughness in which the contour curve elements have an average length (RSm) of 0.8-10 µm and a maximum height (Rz) of 0.2-5 µm.  (2) In the surface having the roughness, microfine irregularities having a period of 5-500 nm are formed.  (3) A surface layer is converted to a thin layer of a metal oxide or metal phosphate.  This metal alloy is inserted into an injection mold.  A polyamide resin composition composed of a resin ingredient comprising 56 mass% PA66 and 44 mass% PA610 and glass fibers with which the resin ingredient is filled is injected so as to be disposed on the surface of the alloy.  The polyamide resin composition injected comes into the microfine irregularities and then solidifies.  Thus, the metal alloy is tenaciously bonded to the resultant molded article of the polyamide resin composition.