Chemical oxidation treatment solution for aluminum alloy

Abstract

The invention relates to chemical oxidation treatment solution for aluminum alloy. The solution is aqueous solution formed by dissolving citrate, gluconate, tartrate, trivalent iron salt, chromite and inorganic acid in water, wherein one liter of the solution comprises 6 to 20 grams of citrate, 1 to 5 grams of gluconate, 1 to 3 grams of tartrate, 1 to 5 grams of trivalent iron salt, 3 to 5 grams of chromite and 10 to 30 grams of inorganic acid. The oxidation treatment solution has the advantages of simple preparation, low cost, relatively low control requirement on the technical conditions when used for oxidation treatment and simple and convenient operation; and an obtained oxide film layer is uniform and compact and is closely combined with a substrate. In addition, the oxidation treatment solution is used without being limited to the size and shape of a part and is suitable for surface treatment of various aluminum alloy workpieces.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy surface treatment, in particular to a chemical oxidation treatment solution for the oxidation treatment of the aluminum alloy surface. Background technique [0002] As a widely used industrial material, aluminum alloy is widely used in various industries such as aerospace, automobile, precision instruments, etc. focus on. Due to the low surface hardness of aluminum alloys, it is easy to be worn. Therefore, after the aluminum parts are processed and formed, surface treatment is often required. [0003] In the prior art, the most common surface treatment is chemical oxidation treatment using an oxidation treatment solution. For example, Chinese Invention Patent Application No. 89104371.3 discloses a method for chemically oxidizing the surface of aluminum and its alloys by using a chemical oxidation solution composed of chromic anhydride, fluoride, potassium ferricyanide, surfactants, rare e...

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Problems solved by technology

For example, Chinese invention patent application 89104371.3 discloses a method of chemically oxidizing the surface of aluminum and its alloys using a chemical oxidation solution composed of chromic anhydride, fluoride, potassium ferricyanide, surfactants, and rare elements. After oxidation, the aluminum The alloy oxide film is rice yellow. In this method, since the formed oxide film is chromate, the Cr contained in it 6+ Strictly restricted due to serious pollution problems

Chinese invention patent application 200910000247.2 discloses an oxidation treatment aqueous solution composed of aluminate, citric acid or citrate, metavanadate, fluoride and inorganic acid to oxidize the surface of aluminum alloy. The film layer on the surface of the alloy workpiece is colorless. Compared with the previous oxidation treatment method, this method has improved anti-corrosion effect and environmental protection. However, the bonding between the film layer formed by the oxidation treatment solution and the aluminum substrate is not ideal. Therefore, when using this treatment solution for oxidation treatment, strict control of process conditions is required, which increases the difficulty of operation and affects production efficiency