Micro-arc oxidation pretreatment method of high-silicon aluminum alloy

• Main Author: WANG MIN
• Format: Patent
• Language: Chinese; English
• Published: 23.11.2018
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS

The invention relates to a micro-arc oxidation pretreatment method of a high-silicon aluminum alloy. The method comprises following steps that a mixed solution of HF and concentrated HNO3 with a certain volume ratio is adopted to carry out short-time soaking treatment on the aluminum alloy with the higher silicon content (larger than or equal to 4wt.%), surface layer silicon of a high-silicon aluminum alloy base material is dissolved, the aluminum is basically retained, and then is ultrasonically cleaned, the silicon absorbed on the gas surface is removed, the surface is subject to the low-temperature drying treatment, the base material is subject to micro-arc oxidation in an electrolyte after pre-treatment to obtain a corresponding oxidation film layer, through the high-silicon aluminum alloy pretreatment process, the forming rate of a micro-arc oxidation film layer is obviously improved, energy consumption is reduced, and an oxidation film layer with the compact structure, and excellent wear resistance and