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  • Several Properties Of Anodic Oxidation Treatment Of Aluminum Products In Precision Machining
    Feb 04, 2019

    Aluminum is a metal commonly used in industry and life. Surface treatment is an important part in the process of aluminum processing, with various methods and different effects. Sometimes only one method can meet the needs, and sometimes a variety of methods are needed to meet the requirements of the product. Among them, anodic oxidation is the most widely used method. Next, letundefineds talk about the role of anodizing in precision machining for aluminum surface treatment.


    Strengthening corrosion Resistance of Aluminum products

    Anodic oxidation can produce a layer of oxide film on the surface of aluminum products. The chemical properties of the film are very stable and have strong corrosion resistance. For example, the anodized aluminum material in chromic acid solution has dense oxide film formed on the surface and good corrosion resistance, which is particularly suitable for riveting and welding parts. However, the anodized aluminum in sulfuric acid solution has higher thickness of oxide film and stronger adsorption ability, but the porosity is larger than that of the former, which requires proper filling and sealing treatment.


    Improving the adsorption ability of Aluminium products to pigments

    Aluminum products that have been anodized by chemical or electrochemical polishing will form a highly transparent oxide film on the surface. Moreover, the oxide film is porous and has good adsorption ability. Can effectively adsorb a variety of organic or inorganic dyes, as well as paint and organic film. Therefore, before painting or coloring, anodizing the aluminum material to make the pigment and aluminum materials better combined, so that aluminum products can have a variety of bright colors, increasing the appearance of beauty. Not only that, the color film can also play a very good corrosion-proof effect.


    Wear Resistance of reinforced Aluminum products

    The oxide film formed by anodic oxidation in precision machining is not only anticorrosive, but also very compact. By hard anodic oxidation of aluminum and aluminum alloys, a layer of aluminum trioxide film with large thickness, high hardness and low roughness can be obtained on the surface. And the empty structure will also adsorb some lubricating oil. The existence of this layer of oxide film greatly enhances the wear resistance of aluminum products, and can effectively adapt to the friction working state of aluminum parts, such as automobile engine cylinder, piston and other parts. In sulfuric acid or oxalic acid solution, such oxide films can be obtained by anodizing.


    Realization of Electrical Insulation of Aluminum products

    The film obtained by anodizing has strong electrical insulation because its chemical structure is metal oxide rather than metal. Some aluminum materials require electrical insulation, such as dielectric layers of capacitors. This can be achieved by anodic oxidation.


    As the bottom layer of electroplating for aluminium products

    Before electroplating aluminum and aluminum alloy products in precision machining, the bottom layer must be applied before electroplating can be carried out. There are many ways to apply the bottom layer on the aluminum substrate, including galvanizing, zinc dipping, electroless nickel plating and, of course, anodizing. Due to the porous properties of the oxide film obtained by anodic oxidation, the effect of electroplating can be promoted well.