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Preparation method of composite coating for light alloy component

A composite coating and light alloy technology, applied in metal material coating process, coating, superimposed layer plating, etc., can solve the problems of oxidation of light alloy components, large coating friction coefficient, ablation, etc., and achieve improvement Excellent wear resistance, improved corrosion resistance, and excellent thermal stability

Inactive Publication Date: 2013-03-06
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the promulgation of relevant policies such as national energy conservation and emission reduction, light alloys (such as aluminum alloys, magnesium alloys or titanium alloys, etc.) have been widely used in aviation, aerospace, weapons and civil industries as a substitute for metal materials such as steel to reduce the weight of parts. application and promotion, but light alloys have defects such as low hardness, easy adhesion, high temperature and easy oxidation, which seriously limit the application range of light alloys
[0003] In order to overcome the above-mentioned defects of light alloy materials, protective coatings for light alloy materials have been prepared by micro-arc oxidation technology, but the oxide ceramic coatings prepared by micro-arc oxidation have ablation holes and a certain thickness of porosity. layer, resulting in a large friction coefficient and poor wear resistance of the coating, so the coating needs to be sealed. The existing sealing technology is single, and it is difficult to meet the functional requirements of high temperature and long-term wear resistance.
[0004] However, in the current plasma spraying technology for preparing wear-resistant and heat-insulating coatings, since the flame temperature reaches about 20,000°C during plasma spraying, directly spraying wear-resistant composite coatings on the surface of light alloy substrates will easily cause oxidation and burning of light alloy components. Corrosion, and easy to cause deformation of light alloy components, especially for thin-walled parts

Method used

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  • Preparation method of composite coating for light alloy component
  • Preparation method of composite coating for light alloy component
  • Preparation method of composite coating for light alloy component

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiment 1 A method for preparing a composite coating of a light alloy element, characterized in that: the light alloy element is a titanium alloy element, which includes:

[0040] (1) Grinding the wear surface of titanium alloy components, so that the surface roughness of the wear surface is above Ra0.47;

[0041] (2) Impurities such as oil stains, dust and the like that exist on the titanium alloy element wear surface surface after step (1) are processed are cleaned;

[0042] (3) performing micro-arc oxidation treatment on the titanium alloy element processed in step (2) to prepare a ceramic coating;

[0043] (4) cleaning the titanium alloy element after step (3) with ultrasonic waves, and protecting the non-abrasive surface of the titanium alloy element surface;

[0044] (5) The surface of the titanium alloy element after step (4) is sprayed with Ni_Cr_Cr by plasma spraying equipment 3 C 2 coating;

[0045] (6) Grinding the titanium alloy element processed in s...

Embodiment 2

[0047] Embodiment 2 A method for preparing a composite coating of a light alloy element, characterized in that: the light alloy element is an aluminum alloy element, which includes:

[0048] (1) Grinding the wear surface of aluminum alloy components, so that the surface roughness of the wear surface is above Ra0.47;

[0049] (2) Impurities such as oil stains, dust, etc. that exist on the surface of the aluminum alloy element wear surface after the step (1) is processed are cleaned;

[0050] (3) Carry out micro-arc oxidation treatment to the aluminum alloy element after step (2) to prepare a ceramic coating, the electrolyte used in the micro-arc oxidation treatment is an alkaline silicate-phosphate system, and the micro-arc oxidation treatment The specific parameters are: current density 6A / dm 2 , Voltage 0-600V, duty cycle 30%, frequency 800Hz, processing temperature at room temperature, processing time 135min;

[0051] (4) ultrasonically cleaning the aluminum alloy element ...

Embodiment 3

[0055] Embodiment 3 A method for preparing a composite coating of a light alloy element, characterized in that: the light alloy element is a magnesium alloy element, comprising:

[0056] (1) Grinding the wear surface of magnesium alloy components, so that the surface roughness of the wear surface is above Ra0.47;

[0057] (2) Impurities such as oil stains, dust and the like that exist on the surface of the magnesium alloy component wear surface after step (1) are processed are cleaned;

[0058] (3) Carry out micro-arc oxidation treatment to the magnesium alloy element after step (2) to prepare ceramic coating, the electrolytic solution that its micro-arc oxidation treatment adopts is alkaline silicate-phosphate system, and described micro-arc oxidation treatment The specific parameters are: current density 1.3A / dm 2 , Voltage 0-380V, duty cycle 20%, frequency 600Hz, processing temperature 35°C, processing time 50min;

[0059] (4) ultrasonically cleaning the magnesium alloy e...

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Abstract

The invention relates to a preparation method of a composite coating for a light alloy component. The method comprises the following steps of: polishing a wear surface of the light alloy component; removing the impurities on the surface of the wear surface such as the oil contamination, the dust and the like; performing the microarc oxidation to the treated light alloy component to prepare a ceramic coating; ultrasonically cleaning the light alloy component; protecting a non-wear surface of the light alloy component; spraying an Ni-Cr-Cr3C2 coating or a Ni-Cr-Al-Y coating onto the surface of the light alloy by a plasma sprayer; and polishing the light alloy component with the prepared composite coating, wherein the light alloy component is an aluminum alloy component, a magnesium alloy component or a titanium alloy component. The preparation method is easy to operate, and is suitable for preparing the composite coating for the light alloy components of various shapes, so that the wear resistance and the corrosion resistance of the light alloy component are improved, and the prepared composite coating is compact, wear-resistant, corrosion-resistant and good in heat stability.

Description

technical field [0001] The invention relates to the field of surface coatings of light alloy material elements, in particular to a preparation method of a composite coating on the surface of light alloy material elements. Background technique [0002] With the promulgation of relevant policies such as national energy conservation and emission reduction, light alloys (such as aluminum alloys, magnesium alloys or titanium alloys, etc.) have been widely used in aviation, aerospace, weapons and civil industries as a substitute for metal materials such as steel to reduce the weight of parts. However, light alloys have defects such as low hardness, easy adhesion, high temperature and easy oxidation, which seriously limit the application range of light alloys. [0003] In order to overcome the above-mentioned defects of light alloy materials, protective coatings for light alloy materials have been prepared by micro-arc oxidation technology, but the oxide ceramic coatings prepared b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C25D11/02C23C4/04C23C4/12C23C4/06C23C4/073C23C4/134
Inventor 陈海涛张隆平李忠盛何庆兵孙彩云李立
Owner NO 59 RES INST OF CHINA ORDNANCE IND