[China Aluminum Industry Network] The chemical conversion of aluminum and aluminum alloys consists of a direct reaction between the aluminum surface and the chemical oxidants in the solution. This process requires no applied voltage, and is also called chemical oxidation treatment. Chemical conversion can be divided into alkaline and acidic two types according to the nature of its solution, and according to the nature of the film layer, there are oxide film, phosphate film, chromate film and chromate-phosphate film. The resulting layers are collectively referred to as chemical conversion films.
Chemical conversion coating is widely used, in addition to the usual protective effect, some conversion coatings obtained by the technical formula also have decorative effects (the surface needs to be covered with varnish), and some can improve the contact strength with the coating. Some chemical conversion treatment can still maintain the original conductive function, so the film is also known as conductive conversion film.
Chemical conversion treatment technology is simple in operation, simple in required equipment, high in production efficiency, and low in production cost. The conversion film obtained has a wide range of application, and is a coating type with a wide prospect and promotion value.
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