Preparation method for aluminum-based transition coating of die-casting aluminum alloy shell

A technology of casting aluminum alloy and casing, which is applied in the direction of metal material coating process, coating, ion implantation plating, etc., can solve the problems of non-corrosion resistance, single anodic oxidation treatment process, coating appearance smoothness or poor color, etc. Achieve the effect of improving wear resistance and corrosion resistance, improving the corrosion resistance of the substrate, and eliminating surface defects

Active Publication Date: 2016-04-20
晨光真空技术(东莞)有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is no application report of vacuum coating technology for aluminum alloy mobile phone shells. In particular, the new generation of die-casting aluminum alloy shells represented by Apple mobile phones still use a single anodic oxidation process, and the appearance of the oxide layer is smooth, uniform and stable in color. Compared with the CNC machining shell, it has declined to varying degrees, and the pass rate of the product needs to be improved urgently.
According to the analysis, the main reason is that aluminum alloy deformation stress, shrinkage pores, composition segregation, etc. appeared during the high-temperature die-casting process before oxidation. Unevenness is easy to make the coating fall off early in the process of use, or it is not resistant to abrasion, or it is not resistant to corrosion

Method used

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  • Preparation method for aluminum-based transition coating of die-casting aluminum alloy shell

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Embodiment 1

[0014] This embodiment provides a method for preparing an Al-based transitional coating on the surface of a die-cast mobile phone shell of a 1050 pure aluminum alloy (commercially available, wherein content: Al: 99.50%, and the balance is Si, Cu, Mg and unavoidable impurities) . It should be noted that the Al-based transition coating prepared by the method of the present invention can be applied to any aluminum alloy die-casting mobile phone casing, notebook computer casing, and other intelligent terminal casings, and is not limited to the following examples.

[0015] The concrete preparation process of this embodiment is:

[0016] (1) A 1050 pure aluminum alloy die-cast mobile phone case with a size of 145mm×75mm×6mm was used as a sample. After the surface was degreased and polished, it was immersed in acetone for ultrasonic cleaning and alcohol dehydration.

[0017] (2) Put the pretreated sample on the turret platform of the vacuum magnetron sputtering ion plating equipment...

Embodiment 2

[0028] The difference between this example and Example 1 is that three φ100mm×20mm arc Cr-based targets are replaced with Ti-based targets to prepare a Ti bottom layer / Al transition coating, and the preparation process and parameters involved in the process are the same as those in Example 1. .

[0029] The prepared die-casting aluminum alloy casing was tested after subsequent anodic oxidation treatment. The appearance of the oxide layer was uniform in color, and the microhardness of the oxide layer was Hv500. The coating did not fall off after the sample was bent at 180 degrees. The corrosion resistance of the neutral salt spray test exceeded 48. Hour.

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Abstract

The invention discloses a preparation method for an aluminum-based transition coating of a die-casting aluminum alloy shell. The preparation method comprises the steps that a Cr basal layer or Ti basal layer is deposited on the surface of a die-casting aluminum alloy mobile telephone shell by adopting multiple electric arc Cr-based targets or Ti-based targets through vacuum magnetron sputtering ion plating equipment; the pure Al coating is prepared on the Cr basal layer or Ti basal layer by taking multiple pairs of planar Al targets evenly installed on the inner wall of a furnace body as an Al source, taking pure Ar as sputtering gas and ensuring the effective glow discharge process and target material sputtering. The prepared die-casting aluminum alloy shell is processed through follow-up anodic oxidation and then tested, the appearance of an oxidation layer is uniform in color and luster and presents various colors and luster, the microhardness of the oxidation layer is Hv500, the coating does not fall off after a sample is bent 180 degrees, the corrosion resistance of a neutral salt spray test exceeds 48 hours, and the oxidation coating quality and technique index requirements of the aluminum alloy shell are completely met.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to the design and preparation method of an aluminum-based transition coating on the surface of a die-casting aluminum alloy shell for subsequent anodic oxidation treatment. Background technique [0002] Smartphones are generally required to be lightweight and easy to carry, and their shells should have perfect decoration, as well as excellent performance such as scratch resistance, corrosion resistance, and wear resistance. Therefore, mobile phone casings are mostly made of materials such as stainless steel, aluminum alloy, magnesium alloy or plastic, especially aluminum alloy metal casings are popular and widely used in recent years. It can express the beauty and design of the product, which is unmatched by stainless steel and engineering plastics. Aluminum alloy is light in weight, but its hardness is not high, its wear resistance is insufficient, and its po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/46C23C14/16
CPCC23C14/16C23C14/352C23C14/46
Inventor 梁智涛张亚梁马胜利
Owner 晨光真空技术(东莞)有限公司
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