7 series aluminum hard anodizing

7 series aluminum refers to aluminum zinc magnesium alloy, with high strength and good corrosion resistance, widely used in aviation, aerospace, automotive, machinery manufacturing and other fields. Hard anodizing is a process that forms a thick and hard oxide film on the surface of an aluminum alloy, which can further improve the wear and corrosion resistance of the material.

​Hard anodizing process

​According to the information in the search results, the hard anodizing process mainly includes the following steps:

​Degreasing treatment: remove the grease and dirt on the surface of the workpiece to ensure the uniformity and adhesion of the oxide film.

​The first peeling film treatment: the original oxide film on the surface of the workpiece is removed so that a new oxide film can be better formed.

​Chemical polishing treatment: Through chemical methods to make the surface of the workpiece more smooth, improve the quality of the oxide film.

​Second stripping treatment: Remove the oxide film on the surface of the workpiece again to ensure that the new oxide film can be better formed.

​Anodizing treatment: the workpiece is used as an anode and electrolyzed in the electrolyte to form an oxide film on the surface of the workpiece.

​Pre-dyeing treatment: the oxide film is treated to make it have good dyeing properties.

​Dyeing: As needed, the workpiece is immersed in the dye to color the oxide film.

​Sealing treatment: close the microholes in the oxide film, improve the corrosion resistance and wear resistance of the oxide film.

​Characteristics and advantages of hard anodizing

​High hardness: The hardness of hard anodized film is extremely high, which can significantly improve the wear resistance and corrosion resistance of the workpiece.

​Controllable thickness: The thickness of the hard anodized film can be adjusted as needed, usually between 25-150 microns.

​Strong corrosion resistance: Hard anodized film has very high corrosion resistance, especially in industrial atmosphere and Marine climate.

​Good insulation performance: The resistance of the hard anodic oxide film is large, and it can withstand more than 2000 volts.

​Strong binding force: The binding force of the hard anodic oxide film and the base material is strong, and it is not easy to fall off.

​Application field

​Hard anodizing process is widely used in the following fields:

​Aerospace: Components used in the manufacture of aircraft, satellites and other aerospace equipment.

​Automotive industry: Used to manufacture automotive engines, chassis and other key components.

​Mechanical manufacturing: Used to manufacture wear-resistant and corrosion-resistant parts of various mechanical equipment.

​Electronic products: used to make the shell and internal components of electronic products such as mobile phones and laptops.

​conclusion

​Hard anodizing is an effective surface treatment process that can significantly improve the wear and corrosion resistance of 7 series aluminum. Through reasonable process flow and parameter control, high quality hard anodic oxide film can be produced to meet various stringent application requirements.