Composite oxidation method for metallic products

Abstract

The invention provides a composite oxidization method of a metal product, which comprises the following steps: the metal product to be treated receives conductive oxidization treatment; an area on the metal product after conductive oxidization treatment to be conducted is shielded; the shielded metal product receives anode oxidization treatment; the shielding of the area is removed. The method can prepare the metal product with low cost and high yield according to the intention of the designer.

Description

technical field [0001] The invention relates to a surface treatment method for metal products, in particular to a method for treating metal products in a combined manner of conductive oxidation and anodic oxidation. Background technique [0002] Metal products can be made of pure metals or alloys. In some cases of using metal products, in addition to the properties of the metal products themselves, it is also expected that the metal products have good specific properties such as heat dissipation, electromagnetic compatibility, vibration and shock resistance, and corrosion resistance. In order to make metal products have these properties, metal products are usually treated appropriately. In practical applications, treated metal products can ensure that the objects covered or protected by them can work normally in harsh use environments. Metal products are used in practical applications such as housings for military or industrial electronic equipment. [0003] In the prior ...

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Problems solved by technology

However, the disadvantage of this method is that: the paint used in the paint coating process is a high thermal resistance material, which is not conducive to the overall heat dissipation of the electronic module or electronic equipment; the paint coating process has higher requirements on the surface roughness of the electronic equipment casing , and it is easy to be scratched during the assembly and debugging process; the thermal expansion coefficient of the coating used in the paint coating process is quite different from that of the aluminum alloy, and cracks are prone to appear under the condition of a sharp change in the ambient temperature; the paint coating process is only suitable for large Mass production, for a single or small batch production, the cost is high; the paint coating process is a highly polluting process

The disadvantage of this method is that: it is difficult to clamp and position the parts during machining, or the local strength is insufficient, which leads to increased machining errors; when designing the machining process, it is necessary to reserve the size allowance for the removal of the anodized surface; In the process of machining, it is easy to damage the appearance of parts during clamping and positioning; the cost of machining is high and the operation is difficult, which is not conducive to mass production; the contact resistance of the metal surface after removing the anodized surface by machining is much higher Contact resistance on conductive oxide surface

[0008] Therefore, the surface treatment technology of existing metal products has defects such as high cost, low yield, and difficulty in making metal products according to the designer.

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