Method for microporous treatment of metal surface

The invention belongs to the technical field of material treatment and particularly relates to a method for microporous treatment of a metal surface. The method comprises the following steps: (1) performing anodic oxidation on a preprocessed metal base material to obtain a metal base material provided with an anodic oxide film layer on the surface; (2) soaking the metal base material obtained in the step (1) in etching liquor for treatment; (3) putting the metal base material obtained in the step (2) into an anodic oxidation groove with sulfur acid and ammonium chloride for modification treatment; (4) soaking the metal base material obtained in the step (3) in a phosphate anion solution, washing with water, soaking in a washing regulating agent at a room temperature, washing with water, and baking for 0.5-1 hour. The purpose of pore size expansion is achieved in a condition-controllable AAO (anodic aluminum oxide) film production mode, a problem that a conventional pore-forming method cannot obtain ordered controllable micropores is solved, and strict requirements on various aspects of product size, structure and the like are avoided from a macroscopic perspective.