Aluminum alloy surface treatment

1, Sandblasting, main role is surface cleaning, sand blasting in front of painting (paint or spray), can increase surface roughness, have a certain contribution to the adhesion, but contributes limited, not as high as chemical painting.

2, Coloring: There are two main artificial processes to aluminum: one is an aluminum oxidation color process, and the other is an aluminum electrophoresis coloring process. A variety of colors are formed on the oxide film to meet certain use requirements, such as optical instrument parts, commonly used in black memorial chapters.

3, Conductive oxidation (chromate conversion film) - is used in applications where it is necessary to conduct electricity.

4, Chemical oxidation: thin film, thickness of about 0.5 to 4 microns and porous, soft adsorption, can be used as the bottom layer of the organic coating, but its abrasion resistance and resistance are not as effective as anodized Film; aluminum and aluminum alloy chemical oxidation can be divided into two major categories of basic oxidation and acid oxidation methods in their solution properties.

5, Electrochemical oxidation, aluminum and aluminum alloy chemical oxidative treatment equipment is simple, easy to operate, high production efficiency, no power consumption, wide range of applications, no restrictions on parts and shapes. The thickness of the oxide film is about 5 to 20 microns (the thickness of the hard anode oxide film can reach 60 to 200 microns), with higher hardness, good heat resistance and insulation, resistance to chemical oxide, porous, and very Good adsorption capacity.

6, Spraying: external protection for the equipment, decoration usually carried out on an oxidation. The aluminum member should be pre-treatment before painting to make the coating and the workpiece are firmly bonded, and there are three methods 1, phosphating (phosphate method) 2, chromium chromium chromium chromeization) 3, chemically oxidation.

7: Anodic oxidation: The process of plating a thin layer of other metal or alloys on certain metal surfaces using electrolysis principles. The brush is plated with a partial plating or repair. Wiring is suitable for small parts, such as fasteners, washers, pins, and the like. By electroplating, decorative protection and various functional surface layers can be obtained on the mechanical article, and workpieces with wear and processing mistakes can be repaired. .

8. Chemical polishing chemical polishing is a selective self-solubility of acidic or aluminum electrolyte solution by aluminum and aluminum alloys to reduce the surface roughness and pH chemical processing methods. This polishing method has the advantages of simple equipment, no power, is not subject to external dimensional limit, high polishing speed and low processing cost.