A kind of anodic oxidation solution of aluminum alloy and secondary anodic oxidation process

Abstract

The invention belongs to the technical field of aluminum alloy surface processing, and specifically relates to an anodic oxidation liquid of aluminum alloy and a two-time anodic oxidation technology. The anodic oxidation liquid is characterized in that the anodic oxidation processing liquid is prepared by adding concentrated sulfuric acid, a liquid ANODALEE additive, an adenine corrosion inhibitor, and aluminum powder into deionized water according to a certain ratio; wherein each liter of anodic oxidation processing liquid comprises 150 grams of concentrated sulfuric acid, 5 to 10 grams of aluminum powder, 3 to 5 grams of liquid ANODALEE, and 0.3 gram of adenine. A two-time anodic oxidation technology is adopted in the anodic oxidation treatment. The technological parameters of the first time anodic oxidation are as follows: the anodic oxidation temperature is 22 DEG C, the anodic oxidation current density is 1.5 A / cm2, the oxidation voltage is 18 V, and the anodic oxidation time is 40 minutes. The technological parameters of the second time anodic oxidation are the same as those of the first time anodic oxidation. The provided anodic oxidation liquid and two-time anodic oxidation technology have the advantages of environment-friendliness, low cost, and good compactness and combining performance of generated oxidation membrane.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface treatment, and in particular relates to an aluminum alloy anodic oxidation solution and a secondary anodic oxidation process. Background technique [0002] Due to a series of advantages such as low density, strong electrical and thermal conductivity, good forming processability and excellent comprehensive performance, aluminum alloy has become the second largest metal material used in industry after steel. It is one of the metal materials with the largest quantity and widest application range, and is widely used in high-end building materials, transportation, aerospace and high-end electronic products. According to different uses, some properties of aluminum and aluminum alloys are not ideal, such as hardness, wear resistance, corrosion resistance, etc.; in view of the above defects, the surface of aluminum and aluminum alloys is strengthened through anodic oxidation technology, whi...

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Problems solved by technology

According to different uses, some properties of aluminum and aluminum alloys are not ideal, such as hardness, wear resistance, corrosion resistance, etc.; in view of the above defects, the surface of aluminum and aluminum alloys is strengthened by anodic oxidation technology, which expands the strength of aluminum and aluminum alloys. The application range of aluminum alloys prolongs its service life. However, for 2xxx series and 7xxx series aviation aluminum alloys containing higher amounts of copper elements, due to the difference in electrochemical behavior between the copper alloy phase particles contained in these alloys and the aluminum alloy matrix Larger, it is easy to cause local current concentration in the anodizing process, forming local hole defects in the film layer, and reducing the protective performance of the oxide film. Aiming at the above problems, the present invention provides an anodizing solution for aluminum alloys; The secondary anodizing process of this anodizing solution

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