Zhongshan Shanfeng CNC Welding Aluminum Products Co., Ltd.
Zhongshan Shanfeng CNC Welding Aluminum Products Co., Ltd
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Alumimum hard anodizing metal surface treatment technology Improving surface hardness of machinery electronics parts
Definition of hard anodizing
Hard anodizing is an advanced metal surface treatment technology. By performing anodizing electrolysis on the metal workpiece in a specific electrolyte, a dense and extremely hard aluminum oxide ceramic film is formed on its surface. This film not only has excellent wear resistance and corrosion resistance, but also has a strong bond with the base metal and is not easy to fall off. It is widely used to improve the wear resistance, corrosion resistance and surface hardness of metal parts, such as aviation, automobiles, machinery, electronics and other fields.
Differences between hard anodizing and ordinary anodizing:
1. Film thickness: The thickness of ordinary anodizing film is relatively thin; the film thickness of hard anodizing is generally >15μm, which is too low to meet the hardness ≥300HV requirement.
2. Surface state: The surface of ordinary anodizing is smoother, while the surface of hard anodizing is rougher (microscopic, related to the surface roughness of the base).
3. Different porosity: ordinary anodizing has high porosity; while hard anodizing has low porosity.
Process flow of hard anodizing
The process flow of hard anodizing mainly includes three links: pre-treatment, anodizing, and post-treatment.
Pre-treatment mainly involves cleaning, degreasing, and rust removal of metal workpieces to ensure that the surface of the workpiece is clean and free of impurities.
Anodizing is to place the pre-treated metal workpiece into a specific electrolyte for anodic electrolysis to form an alumina ceramic film on the surface of the workpiece.
Post-treatment involves cleaning, drying, and sealing the anodized workpiece to improve the corrosion resistance and wear resistance of the film.
Hard anodizing technology has the following significant characteristics:
1. High hardness: The hardness of the hard anodized film can reach HV2000 or above, which is much higher than the hardness of the ordinary anodized film.
2. Good wear resistance: Due to the high hardness and dense structure of the hard anodized film, it has good wear resistance.
3. Strong corrosion resistance: The hard anodized film has excellent corrosion resistance and can be used for a long time in harsh environments without damage.
4. Strong bonding: The hard anodized film layer is firmly bonded to the base metal and is not easy to fall off.
5. Environmentally friendly and pollution-free: No toxic or harmful chemicals are used in the hard anodizing process, and it does not pollute the environment.
Application fields of hard anodizing
Hard anodizing technology is widely used in aviation, automobile, machinery, electronics and other fields.
In the aviation field, hard anodizing technology is used to manufacture key components such as aircraft engine blades and turbine discs to improve their wear resistance and corrosion resistance.
In the automotive field, hard anodizing technology is used to manufacture automobile engine pistons, valves and other parts to improve their wear resistance and service life. In the mechanical field, hard anodizing technology is used to manufacture various precision mechanical parts, such as molds, cutting tools, etc., to improve their surface hardness and wear resistance.
In the electronics field, hard anodizing technology is used to manufacture electronic products such as semiconductor devices and integrated circuits to improve their insulation performance and stability.