Patent ID: 8322013

Claim:
A method for manufacturing a composite with high corrosion resistance, the method comprising: a step of forming a shaped part by machining a magnesium part or magnesium alloy part from a casting or an intermediate material; a step of immersing and chemically etching said shaped part in an acidic aqueous solution; a step of immersing said chemically etched shaped part in an aqueous solution containing a permanganate and forming on the surface thereof a thin layer having manganese oxide as a component; and a step of inserting said shaped part, on which the thin layer has been formed, into a metallic mold for injection molding and injecting a resin composition into said mold to integrally join said shaped part and resin composition, said resin composition being selected out of: a resin composition comprising a resin component including polyphenylene sulfide by 70 to 97 wt % and polyolefin resin by 3 to 30 wt %, a resin composition comprising a resin component including polybutylene terephthalate resin by 70 to 97 wt % and polyethylene terephthalate resin and/or polyolefin resin by 3 to 30 wt % and a resin composition comprising a resin component including as the main component an aromatic polyamide resin containing both a polyamide obtained from hexamethyldiamine and isophthalic acid and a polyamide obtained from hexamethylenediamine and terephthalic acid.