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Composite film layer for aluminum alloy surface and preparation method thereof

A technology of aluminum alloy surface and composite film layer, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc. and other problems, to achieve the effect of improving corrosion resistance and wear resistance, improving corrosion resistance and hardness, wear resistance and hardness shortening

Active Publication Date: 2021-12-14
深圳市笙歌等离子渗入技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively high cost of stainless steel, aluminum alloys are usually used instead of stainless steel
[0003] However, the corrosion resistance and strength of aluminum alloy are not as good as those of stainless steel, and it is difficult to meet the performance requirements of use. Therefore, it is usually necessary to increase the coating thickness of the aluminum alloy surface
[0004] In view of the related technologies mentioned above, the inventor believes that since the film thickness of PVD coating is generally relatively thin, it is difficult to meet the requirements of corrosion resistance. If the film layer of PVD coating is too thick, it is easy to cause excessive stress and appear The problem of peeling off from the base material. Therefore, the current coating method on the aluminum alloy surface is generally a combination of water plating and PVD coating. Generally, a nickel layer or a chromium layer is plated on the surface of the aluminum alloy first, and then a PVD film is coated on the water coating layer. Floor
The deposition rate of the water coating layer is fast, and the thickness can be relatively thick, which can meet the requirements of corrosion resistance, but the water coating layer is prone to bubbles during the deposition process, resulting in poor bonding between the water coating layer and the aluminum alloy surface, which is easy to detachment of film

Method used

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  • Composite film layer for aluminum alloy surface and preparation method thereof
  • Composite film layer for aluminum alloy surface and preparation method thereof
  • Composite film layer for aluminum alloy surface and preparation method thereof

Examples

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Embodiment 1

[0052] refer to figure 1 , the present embodiment discloses a composite film layer for the surface of an aluminum alloy, including a Cr layer 2, a CrWC layer 3, a WC layer 4 and a DLC layer 5 covering the surface of an aluminum alloy 1 in sequence, wherein the thickness of the Cr layer 2 is 2 μm, and the total thickness of the composite film layer is 4 μm.

[0053] This embodiment also discloses a method for preparing a composite film layer on the surface of an aluminum alloy, comprising the following steps:

[0054] Step 1: Ultrasonic cleaning the aluminum alloy to be coated, and then heating the cleaned aluminum alloy to 220°C in a vacuum coating chamber, evacuating, and keeping the temperature in the vacuum coating chamber at 220°C.

[0055] Step 2, wait for the background vacuum in the vacuum coating chamber to reach 5×10 -3 At Pa, argon gas was introduced, and the intake volume of argon gas was controlled to 80 sccm to make the air pressure reach 0.1 Pa, the bias voltag...

Embodiment 2

[0061] The difference with embodiment 1 only lies in:

[0062] In step 3, adjust the intake volume of argon gas to 240sccm, make the air pressure reach 0.3Pa, set the bias voltage to -120V, turn on the high-power coating power supply of the Cr target, and set the current of the Cr target to 50A, and deposit the Cr layer 150min, close the Cr target.

Embodiment 3

[0064] The difference with embodiment 1 only lies in:

[0065] In step 4, feed acetylene, and control the air intake of acetylene to 80sccm, make the air pressure reach 0.3Pa, set the bias voltage to -120V, turn on the Cr target and the WC target at the same time, and set the current of the Cr target to 35A and Set the current of the WC target to 16A, deposit the CrWC layer for 40 minutes, and turn off the Cr target and the WC target.

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Abstract

The application relates to the field of vacuum coating, and specifically discloses a composite film layer used on the surface of an aluminum alloy and a preparation method thereof. The composite film layer used on the surface of the aluminum alloy includes a Cr layer, a CrWC layer, a WC layer and a DLC layer covering the surface of the aluminum alloy in sequence; the preparation method includes the following steps: step 1, cleaning the alloy; step 2, ion cleaning in the vacuum coating chamber Step 3, deposition of Cr layer; Step 4, deposition of CrWC layer; Step 5, deposition of WC layer; Step 6, deposition of DLC layer; The method of the present application can directly use aluminum alloy instead of stainless steel to be applied to 5G signal transmission tower base stations and mobile phone 3C appearance decoration parts, which has the advantages of low cost and good corrosion resistance, wear resistance, hardness and heat dissipation performance; in addition, The preparation method of the present application has the advantages of easy industrial production and low cost.

Description

technical field [0001] The application relates to the field of vacuum coating, more specifically, it relates to a composite film layer used on the surface of aluminum alloy and a preparation method thereof. Background technique [0002] Due to the excellent performance of stainless steel in resistance to weak corrosive media such as air, steam, and water, the method of plating DLC ​​layer on stainless steel is usually used to prepare and apply to 5G signal transmission tower base stations that require high corrosion resistance and wear resistance of materials. As well as raw materials for mobile phone 3C appearance decorations and other fields. However, due to the relatively high cost of stainless steel, aluminum alloys are usually used instead of stainless steel at present. [0003] However, the corrosion resistance and strength of aluminum alloy are not as good as those of stainless steel, and it is difficult to meet the performance requirements of use. Therefore, it is u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06C23C14/16C23C14/35C23C14/02C23C14/54C23C16/26C23C16/50C23C16/52C23C28/00
CPCC23C14/35C23C14/165C23C14/022C23C14/0057C23C14/0635C23C16/26C23C16/50C23C28/322C23C28/343C23C14/542C23C16/52
Inventor 赵明华汪达文江经纬曲文泽武俊伟
Owner 深圳市笙歌等离子渗入技术有限公司
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