Abstract: A stainless steel and synthetic resin composite molded body and preparation method thereof. After the surface of the flat and even stainless steel had anchor effect, it was connected with various synthetic resin pieces by means of insertion molding. Regardless of the material of the stainless steel piece, the indenting test proved that the strength, of over 15 N/mm2 after connection enabled stable tightness. With insertion molding of the stainless steel piece having anchor effect in the present invention, composite molded products comprising various resin parts can be produced if no displacement or height difference occurs.

Abstract: To be able to efficiently produce a resin component on a magnesium material. [Solution] A composite article is produced by forming an anodic oxide film on one surface of a magnesium material as a consequence of immersing the magnesium material into an electrolyte solution and applying a voltage, and by joining a resin component to the magnesium material by using the anodic oxide film. The electrolyte solution is formed by dissolving sodium dihydrogen phosphate and sodium hydroxide in pure water. The weight mixture ratio (R1) of sodium dihydrogen phosphate and sodium hydroxide is 1:2?R1<2:1, and the voltage is between 20 and 50 V.