What is anodizing treatment
Anodizing is a metal surface treatment process.
It refers to a material protection technique where, in an electrolyte solution, the surface of a metal material is oxidized by applying an external anodic current, forming an oxide film. Also known as surface anodizing.
Regardless of the processing method, aluminum materials and products will have varying degrees of dirt and defects on the surface, such as dust, metal oxides (including natural or aluminum oxide films formed at high temperatures), residual oil stains, asphalt marks, manual handling fingerprints (mainly consisting of fatty acids and nitrogen-containing compounds), welding flux, and corrosive salts, metal burrs, and minor scratches. Therefore, it is necessary to clean the surface of the products chemically and physically before oxidation treatment, to expose the pure metal substrate, facilitating smooth oxidation coloring, and resulting in an artificial film that is firmly bonded to the substrate, meeting requirements for color, thickness, and possessing excellent properties such as corrosion resistance, wear resistance, and weather resistance.
Anodized coating characteristics
1. Bond strength of anodized film
The oxide film is formed directly from the matrix metal, forming a very strong bond with it, making it difficult to peel off using mechanical methods. After oxidation, sheet metal parts undergo Qingdao anodizing and are bent until they break, yet the oxide film remains on the metal. This indicates a much higher bonding strength compared to coated or plated layers. However, due to the brittleness of the oxide film, parts that have been anodized may crack in a network pattern when subjected to significant impact loads and bending deformation, reducing the ductility and surface protective capabilities of the matrix metal. Therefore, parts treated with oxidation are not suitable for withstanding high pressure and deformation.
Several unique methods for anodizing
How does the oxidation method work: 1. Acid-Base Oxidation Method. This involves two different types of oxidation: alkaline oxidation involves dipping the metal into an alkaline solution, with the soaking time determined by the number of carbon atoms in the metal. After the metal components are oxidized in the alkaline solution, hardening the oxidation and then drying them completes the process. Acid oxidation, on the other hand, places the metal into an acidic solution, with the anode process similar to that of alkaline oxidation. Between these two methods, acid oxidation is relatively more economical. The protective film formed after treatment has better corrosion resistance and mechanical strength than alkaline oxidation.
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