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.