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Method for preparing diamond-like composite coating on surface of magnesium alloy

A composite coating, magnesium alloy technology, applied in surface reaction electrolytic coating, metal material coating process, coating and other directions, can solve the problem of mismatch of thermal expansion coefficient and mechanical properties between magnesium alloy substrate and film, easy to fail, etc. Achieve good solid lubrication effect, improve load-carrying capacity, and be suitable for industrial production.

Inactive Publication Date: 2010-03-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Studies have shown that solid lubricating films (such as diamond-like carbon films DLC, MoS 2 etc.) Although it can improve its tribological properties, it is easy to fail in many cases due to the mismatch of thermal expansion coefficient and mechanical properties between the magnesium alloy substrate and the film

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0020] The sample to be processed is a die-cast AM60B magnesium alloy with a size of 20mm×36mm×2mm. The specific operation steps are as follows:

[0021] 1. Sample pretreatment: Use 500~1000# water sandpaper to polish the surface of the sample to its roughness R a ≈0.18 μm. The polished sample surface was cleaned with ordinary detergent to remove oil stains, and then rinsed with distilled water.

[0022] 2. Micro-arc oxidation treatment: electrolyte composition Na 2 SiO 3 8~12g / L, KOH 0.5~1.5g / L. Immerse the pretreated magnesium alloy sample in the above electrolyte, control the solution temperature between 25 and 30°C, use positive pulse current, set the frequency at 150Hz, positive pulse width 1.0ms, negative pulse width 1.5ms, oxidation The current density is constant at 6.0A / dm during the process 2 . The oxidation time is 20-60 minutes. After the oxidation treatment is completed, the sample is rinsed with tap water and dried naturally to obtain a ceramic oxide trans...

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Abstract

The invention relates to a method for a titanium doped diamond-like composite coating with good abrasion proof and self lubricating properties on the surface of magnesium alloy. The method comprises the following steps that: firstly, a ceramic transition layer, which has a porous structure and is high in bonding strength and hardness, is formed on the surface of magnesium alloy by the micro arc oxidation treatment process; secondly, a titanium doped diamond-like film surface layer with solid lubricating property is deposited by the magnetic control sputtering method; and finally the micro arcoxidation / diamond-like composite coating is obtained on the surface of magnesium alloy. The coating can be used in oil-free lubrication fields such as magnesium alloy parts of an automobile, aviation / aerospace and the like, and the application range of the coating on moving parts is widened.

Description

technical field [0001] The invention relates to a method for preparing a titanium-doped diamond-like composite coating with wear resistance and self-lubricating properties on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy is the lightest metal structure material in practical application (its density is 1 / 4 of steel and 2 / 3 of aluminum), it has light specific gravity, high specific strength and specific stiffness, strong damping and shock absorption, and good thermal conductivity , good impact resistance, strong electromagnetic shielding ability, easy recycling and a series of advantages. As a new generation of green, high-strength, and lightweight metal structure materials, magnesium alloys have some incomparable advantages in the fields of automobile industry, aerospace, weaponry, computers, communication products, and consumer 3C electronic products. With the continuous expansion of the application field of magnesium alloys from structural...

Claims

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Application Information

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IPC IPC(8): C23C28/00C25D11/00C23C14/35
Inventor 王立平薛群基张广安梁军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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