Anodic multicolour surface treatment method of aluminium alloy

Abstract

The invention provides an anodic multicolour surface treatment method of an aluminium alloy, comprising the following steps of: processing the contour of a base material by a processing machine; degreasing the processed base material; then carrying out anodic treatment on the base material so as to form an oxidation layer; forming a thin film on the outer surface of the anodic treated base material so as to provide a masking effect for the base material; processing the base material formed with the thin film s to partially remove the thin film and the oxidation layer which cover the outer surface of the base material so as to enable the partial outer surface of the base material to be exposed out of the oxidation layer and the thin film; degreasing the partially processed base material; and finally carrying out another anodic treatment on the base material so as to the form another oxidation layer on the partial outer surface of the base material to enable the outer surface of the base material to accurately present more than one colour effect. Therefore, the invention provides a method capable of relatively improving the anodic processing efficiency and quality of the aluminium alloy.

Description

technical field [0001] The invention relates to a method for anodic surface treatment of aluminum alloys, especially a method for multi-color treatment on the surface of aluminum alloys, which generally belongs to the application of anodic treatment and is applied to the technical field of aluminum alloy products. Background technique [0002] Anodic treatment is a method in conversion coating technology, which mainly uses chemical or electrochemical treatment methods to form a film layer containing the metal component on the surface of the metal, such as: zinc chromate film Treatment, phosphate film treatment of steel and anodic treatment of aluminum alloys, etc. At present, the industry uses the characteristics of easy oxidation of aluminum alloy products to control the formation of oxide layer through electrochemical methods of anodic treatment to prevent further oxidation of aluminum materials. In addition, In order to produce various colors on different parts of the alu...

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Problems solved by technology

[0004] 1. Between each anodic treatment, it is necessary to perform cutting and other treatments on the aluminum material, so as to process the desired shape and remove the oxide layer left by the previous anodic treatment, so that the oxide layer of different colors can be formed at the cutting place However, when cutting, it is often necessary to use cutting fluid. If the aluminum material is not cleaned after processing, a little oil stains will adhere to the outer surface of the aluminum material. During the next anodic treatment, it will cover the oil stained parts, that is, Inability to effectively attach the oxide layer to the aluminum resulting in poor processing results

[0005] 2. For the existing anodic treatment in the industry, after the first anodic treatment, if a protective layer is not formed at the anodized place, then the oxide layer of the first anodized treatment will be given to the electrode during the second anodic treatment. Part of the electrode is down, causing processing defects

[0006] 3. For the existing anodic treatment in the industry, after the first anodic treatment, if a protective layer is not formed at the anodized place, then the second oxide layer will be superimposed during the electrode process of the second anodic treatment. On the oxide layer of the first anodization, the defect situation that causes cross-coloring

[0007] 4. For example, in the existing anodic treatment in the industry, after the first anodic treatment, an ink layer is formed on the oxide layer to protect it, but this oil film layer is easy to produce processing defects such as tearing at the edge of the cut during the second cutting process

[0008] 5. Like the existing anodic treatment in the industry, after the first anodic treatment, an ink layer is formed on the oxide layer to protect it, but this oil film layer needs to be removed after the second anodic treatment, which only increases the process

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