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Corrosion and abrasion resistant Cr-DLC coating for aluminum alloy surface and preparation methods of Cr-DLC coating

An aluminum alloy surface, anti-corrosion and wear-resistant technology, applied in metal material coating process, coating, ion implantation plating, etc., can solve the problem of surface roughness of coating size accuracy and the difficulty of preparing high hardness DLC film , laser cladding method to form brittle phases and cracks, etc., to achieve the effect of uniform and dense deposited film, small friction coefficient, good repeatability and reliability

Inactive Publication Date: 2016-04-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

The oxide film obtained by anodic oxidation treatment is relatively thick, so the corrosion resistance is better, but due to the poor adhesion of the coating, high cost and unsatisfactory impact resistance of the coating, it is less used in industrial production; laser cladding The method is easy to form brittle phases and cracks on the interface, and the dimensional accuracy of the coating, the tolerance to the complex shape of the substrate, and the surface roughness are difficult to solve in practical applications; the disadvantage of the rare earth conversion coating method is that the rare earth salt is soaked for a long time The processing time is long and the temperature required for processing is also high
However, since aluminum alloy is a soft metal, it is very difficult to prepare a high-hardness DLC film on its surface. So far, there has been no report on the use of magnetron sputtering equipment to deposit a diamond-like coating on the surface of aluminum alloy for surface modification.

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  • Corrosion and abrasion resistant Cr-DLC coating for aluminum alloy surface and preparation methods of Cr-DLC coating
  • Corrosion and abrasion resistant Cr-DLC coating for aluminum alloy surface and preparation methods of Cr-DLC coating
  • Corrosion and abrasion resistant Cr-DLC coating for aluminum alloy surface and preparation methods of Cr-DLC coating

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[0039] Another aspect of the present invention provides a method for preparing an anti-corrosion and wear-resistant Cr-DLC coating on the surface of an aluminum alloy, which may include: using magnetron sputtering technology, using graphite and chromium as cathode targets, The anti-corrosion and wear-resistant Cr-DLC coating is prepared on the surface of the alloy.

[0040]In a typical embodiment, a preparation method for an anti-corrosion and wear-resistant Cr-DLC coating on the surface of an aluminum alloy may comprise the following steps:

[0041] Step 1, performing surface pretreatment on the aluminum alloy substrate (hereinafter also referred to as aluminum alloy substrate, aluminum alloy substrate or substrate);

[0042] Step 2, put the pretreated aluminum alloy substrate on the substrate holder in the vacuum chamber of the magnetron sputtering equipment, and evacuate the vacuum chamber of the magnetron sputtering equipment;

[0043] Step 3, introduce high-purity Ar (pu...

Embodiment 1

[0054] (1) Process the aluminum alloy into a square with a side length of 25 mm and a thickness of 3 mm.

[0055] (2) Use ordinary detergent to degrease and decontaminate the processed aluminum alloy substrate, and then use 400-1200 # The samples were polished with sandpaper, and finally the surface was polished to a surface roughness of 30 nm. Put the polished aluminum alloy into acetone and absolute ethanol to ultrasonically clean it for 10 min respectively, and finally use N 2 blow dry.

[0056] (3) Put the aluminum alloy substrate after polishing and cleaning into the vacuum chamber of the magnetron sputtering equipment, then close the vacuum chamber, and evacuate until the vacuum degree is less than or equal to 3.0×10 -3 Pa.

[0057] (4) Introduce high-purity Ar, and at the same time turn on the graphite column arc with a current of 0.2A, turn on the chromium column arc with a current of 0.3A, and apply a -500V bias to bombard and clean the substrate for 30 minutes to ...

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Abstract

The invention discloses a corrosion and abrasion resistant Cr-DLC coating for an aluminum alloy surface and preparation methods of the Cr-DLC coating. The Cr-DLC coating comprises a Cr primer and a DLC coating, wherein the Cr primer is directly formed on the surface of an aluminum alloy substrate; and the DLC coating is directly formed on the Cr primer and doped with Cr. Among the preparation methods, one typical preparation method comprises the following steps that graphite and chromium are taken as cathode target materials, and the Cr-DLC coating is prepared on the aluminum alloy surface by use of a magnetron sputtering technology. The Cr-DLC coating has the advantages that the DLC coating doped with Cr is smooth in surface, compact in structure, high in rigidity, small in coefficient of friction, and resistant to both abrasion and corrosion; and meanwhile, the preparation process is simple, the repeatability and the reliability are high, and the cost is low.

Description

Technical field [0001] The present invention involves a preparation process for the surface protection coating on the surface of aluminum alloy. It specially involves an anticorrosive wear-resistant CR-DLC coating and preparation method for the surface of the aluminum alloy surface. It belongs to the field of aluminum alloy surface treatment and surface modification technology. Background technique [0002] The density of aluminum alloy is small, high strength, excellent conductivity, heat conduction performance, good plasticity and moldability, easy processing, and is widely used in the fields of aerospace, military industry, construction, automobiles, ships and other fields.However, the hardness of aluminum alloy is low, poor abrasion resistance, and poor corrosion resistance, which greatly restricts the application prospects of aluminum alloy.Therefore, the surface treatment of aluminum alloy is very important to provide effective protection and improve the surface performance...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/16C23C14/35
Inventor 赵文杰秦立光刘刚曾志翔乌学东薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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