Aluminum alloy differential arc oxidation batch production technique

Abstract

The invention relates to a mass-production technique of micro-arc oxidation for an aluminum alloy. A cleaned aluminum alloy workpiece is placed into an electrobath filled with electrolyte, and a constant current is adopted to conduct a micro-arc oxidation. The average current density is 0.5 to 3A / dm<2>, the electrified duration is 5 to 120 minutes and then the aluminum alloy workpiece is washed in water and then blown-dry. The invention has the advantages are that the invention has low oxidation current density and low demand for the pretreatment of the workpiece, causes no pollution to the environment and no corrosion to the equipment or workshops, has simple prescription component as well as convenient maintenance and needs no special refrigerating equipment.

Description

technical field [0001] The invention relates to a material surface treatment method, in particular to an aluminum alloy micro-arc oxidation mass production process. Background technique [0002] The concept of micro-arc oxidation was first proposed in the 1950s, gradually aroused the research interest of foreign academic circles in the late 1970s, and became a research hotspot of domestic and foreign scholars in the 1990s. Micro-arc oxidation technology is developed on the basis of anodic oxidation technology, but the formation mechanism of the film layer of the two is very different, which leads to the difference in their preparation process and film performance. The micro-arc oxidation technology uses a higher voltage in the preparation, which is completely beyond the scope of anodic oxidation, and the preparation voltage area is introduced from the Faraday area to the high-voltage discharge area. In the micro-arc oxidation process, chemical oxidation, electrochemical oxi...

AI Technical Summary

Problems solved by technology

[0005] 1. High working voltage (above 500V), high current density (10-20A / dm 2 ) brings difficulties to the manufacture of industrial mass production equipment (especially high-power power supply);

[0006] 2. There is a lot of heat dissipation during the oxidation process, and the temperature of the electrolyte rises rapidly and is difficult to control. It is necessary to equip large-capacity refrigeration and heat exchange equipment;

[0007] 3. Due to the ineffective heat release of the bath liquid, the energy waste is serious, resulting in high costs and poor economic benefits, making it difficult to use in the production of civilian products