Anode special for oxidation of deep hole aluminum piece hard anode and oxidation method of deep hole aluminum piece hard anode

Abstract

The invention discloses an anode special for oxidation of a deep hole aluminum piece hard anode and an oxidation method of the deep hole aluminum piece hard anode. According to a machining method of the special anode, a titanium material TA2 with both better conductivity and strength is adopted, so that good conductivity, corrosion resistance and convenience for clamping are guaranteed, and the requirements for oxidation of the deep hole piece hard anode are met. Since the oxidation of the deep hole hard anode is special, the selection of a material which has good selectivity and that a clamp can be soaked into sulfuric acid solution for long time without being easily dissolved or oxidized is particularly important. The treatment of the special clamp is that: a TA2 titanium plate or titanium wire is subjected to treatment such as welding and then used for the deep hole piece hard anode oxidation clamp. The conduction mode is that power is supplied by the anode. The anode provided by the invention is used for oxidation; the qualification rate of products at one time can be increased by over 98 percent; and the consumption and the production cost of the clamp are greatly reduced while the product quality is guaranteed.

Description

technical field [0001] The invention relates to the field of electroplating, in particular to a special anode for hard anodic oxidation of deep-hole aluminum parts and an oxidation method thereof. [0002] Background technique [0003] Hard anodic oxidation is a process for surface treatment of aluminum parts. Due to the excellent performance of the hard anodized film layer, it can achieve the performance that matches the steel parts; at the same time, the application requirements for aluminum alloy parts in mechanical products It is extremely strict, so hard anodizing is the best way to treat the surface of aluminum parts in mechanical products. [0004] When hard anodizing some deep-hole aluminum parts, aluminum wire is generally used to fix the workpiece on the fixture, and the fixture is hung on the copper rod for hard anodizing. The aluminum wire in contact with the workpiece is easy to burn. In addition, the aluminum wire also undergoes hard anodizing during the hard...

AI Technical Summary

Problems solved by technology

[0006] 1) The appearance requirements of hard anodized aluminum parts with deep holes are relatively high, and there must be no large area of ​​fixture contact marks in the inner hole. The use of aluminum fixtures has good electrical conductivity, but the aluminum fixtures are also oxidized with the workpiece at the same time, and the current consumption is large. Therefore, the workpiece The thickness of the oxide film is uneven, and the performance of the film is not good

[0007] 2) Due to the use of aluminum fixtures, as the thickness of the hard oxide film increases during the oxidation process, the poor conductivity of the fixtures will easily cause ablation at the contact position between the workpiece and the fixture

[0008] 3) Due to the use of aluminum fixtures, the durability is poor, and the cost of fixtures is high

Before reuse, it is necessary to treat the aluminum fixture, i.e. corrode and remove the oxide film on the fixture, before it can be used. Due to the repeated oxidation and corrosion of the aluminum fixture, the strength of the fixture will inevitably be damaged, causing the workpiece to drop sulfuric acid during the oxidation process. solution and affect product quality

[0009] 4) During the hard anodizing process using aluminum fixtures, the dissolution of the aluminum fixtures leads to an increase in impurity ions in the solution, which affects product quality

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