Preparation method of magnesium alloy surface micro-arc oxidation/intelligent slow-release structure integrated composite coating

• Main Authors: DU KEQIN, GUO QUANZHONG, WANG YONG, DU JIANAN, GUO XINGHUA
• Format: Patent
• Language: Chinese; English
• Published: 30.11.2018
• Subjects: APPARATUS THEREFOR; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS

The invention discloses a preparation method of a magnesium alloy surface micro-arc oxidation/intelligent slow-release structure integrated composite coating, and belongs to the technical field of metal surface treatment. The method comprises the steps that a layer of compact micro-arc oxidation film framework structure is formed on the surface of magnesium alloy, then, a magnesium alloy sample with the micro-arc oxidation film (MAO) framework structure is immersed into modified hydrogel, and after the modified hydrogel is loaded with a corrosion inhibitor, the micro-arc oxidation/intelligentslow-release structure integrated composite coating is formed on the surface of the magnesium alloy. The prepared MAO film metallurgically combined with a matrix restrains the stripping effect of damage boundary position matrix filiform corrosion on the coating, the hydrogel in microholes forms a micro-nano slow-release structure with the reliable mechanics guarantee and responses to the micro-area corrosion in a long-act