Manufacturing method of metal-polymer resin bonded component

A method of manufacturing a metal-polymer resin bonded body, comprising:

• degreasing metal using a degreasing solution;
• etching the metal using an etching solution, the etching comprising:
• forming uniform primary pores on the metal surface by a first etching process using a first acidic etching solution;
• and
• forming secondary pores finer than the primary pores on the metal surface by a second etching process using a second basic etching solution;
• electrolyzing the metal using an electrolyte solution;
• and
• performing a polymer resin injection to bond a polymer resin to the metal,
• wherein the electrolyte solution includes a compound containing distilled water, oxalic acid, sulfuric acid, and carboxylic acid.