Anti-corrosion and heat-conducting composite coating on light-alloy radiator surface, preparation method of anti-corrosion and heat-conducting composite coating and light alloy radiator

A heat-conducting composite, radiator technology, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problems of complex shape and size of radiator, waste water and waste gas discharge, difficult coating uniform coating, etc., to achieve anti-corrosion Excellent performance, good thermal conductivity and long service life

Inactive Publication Date: 2017-12-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the promulgation of relevant domestic environmental protection regulations, processes such as passive film cleaning of natural oxidation on the surface of light alloys and formation of conversion films with anti-corrosion effects (such as anodic oxidation, chemical conversion treatment, etc.) have waste water and waste gas emissions during the execution process.
In addition, the shape and size of most heat sinks are relatively complex, and it is difficult to achieve uniform coating by traditional powder spraying technology

Method used

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  • Anti-corrosion and heat-conducting composite coating on light-alloy radiator surface, preparation method of anti-corrosion and heat-conducting composite coating and light alloy radiator
  • Anti-corrosion and heat-conducting composite coating on light-alloy radiator surface, preparation method of anti-corrosion and heat-conducting composite coating and light alloy radiator

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment is to prepare an anti-corrosion and heat-conducting composite coating on a 6061 aluminum alloy radiator base material, comprising the following steps:

[0026] Step 1: The 6061 aluminum alloy radiator base material to be processed is clamped by a tooling fixture, and then placed in an oxidation tank in a micro-arc oxidation (plasma electrolytic oxidation) system, and used as an anode, and the electrolyte in the oxidation tank is Sodium silicate 10g / L, sodium hexametaphosphate 30g / L, the balance is a solution of deionized water or distilled water, with 316L stainless steel as the cathode, turn on the pulse power supply, carry out micro-arc oxidation, and set the average current in cross flow during the oxidation process Density 5A / dm 2 Or constant voltage setting output voltage value is 500V, frequency 1000Hz, pulse width 160μs, oxidation time 5min; form a layer of metal oxide layer in situ oxidation of various metal elements on the surface of 6061 alumin...

Embodiment 2

[0033] This embodiment is to prepare anti-corrosion and heat-conducting composite coating on 6063 aluminum alloy radiator base material, comprises the following steps:

[0034] Step 1: The 6063 aluminum alloy radiator substrate to be processed is clamped by a tooling fixture, and then placed in an oxidation tank in a micro-arc oxidation (plasma electrolytic oxidation) system, and used as an anode, and the electrolyte in the oxidation tank is Sodium silicate 5g / L, sodium hexametaphosphate 40g / L, the balance is a solution of deionized water or distilled water, 316L stainless steel is used as the cathode, the pulse power is connected, and the micro-arc oxidation is carried out, and the average current is set in cross flow during the oxidation process Density 3A / dm 2 Or constant voltage setting output voltage value is 540V, frequency 1500Hz, pulse width 120μs, oxidation time 15min; form a layer of metal oxide layer in situ oxidation of various metal elements on the surface of 6063...

Embodiment 3

[0041] This embodiment is to prepare anti-corrosion and heat-conducting composite coating on TC4 titanium alloy radiator base material, comprises the following steps:

[0042] Step 1: The TC4 titanium alloy radiator base material to be processed is clamped by a fixture, and then placed in an oxidation tank in a micro-arc oxidation (plasma electrolytic oxidation) system, and used as an anode, and the electrolyte in the oxidation tank is Sodium silicate 5g / L, sodium hexametaphosphate 40g / L, potassium fluoride 5g / L, the balance is a solution of deionized water or distilled water, with 316L stainless steel as the cathode, connected to the pulse power supply, micro-arc oxidation, oxidation Process cross flow setting average current density 4.8A / dm 2 Or constant voltage setting output voltage value is 480V, frequency 800Hz, pulse width 100μs, oxidation time 30min; form a layer of metal oxide layer in-situ oxidized by various metal elements on the surface of TC4 titanium alloy radiat...

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Abstract

The invention discloses an anti-corrosion and heat-conducting composite coating on the light-alloy radiator surface, a preparation method of the anti-corrosion and heat-conducting composite coating and a light alloy radiator with the anti-corrosion and heat-conducting composite coating. The composite coating comprises a metal oxide layer formed by oxidizing light alloy radiator base metal in situ and an electrophoretic paint film layer provided with carbon nano-particles dispersedly distributed and located on the metal oxide layer in a covering manner. The preparation method comprises the steps that (1), micro-arc oxidation is conducted, and the metal oxide layer formed by oxidizing the light alloy radiator base metal in situ is formed on the surface of the light alloy radiator base material; and (2), electrophoretic deposition is conducted, and the layer of electrophoretic paint film is deposed on the surface of the metal oxide layer. The composite coating has the beneficial effects of being uniform, dense, excellent in anticorrosion performance, good in thermal conductivity, ultralong in service life and the like. The preparation method is environmentally-friendly, safe, reliable, good in repeatability, capable of achieving automatic large-batch industrial production with low cost and short processes.

Description

technical field [0001] The invention belongs to the technical field of surface coating preparation, and in particular relates to an anti-corrosion and heat-conducting composite coating on the surface of a light alloy radiator, a preparation method thereof, and a light alloy radiator with the composite coating. Background technique [0002] At present, the development trend of the service environment for heat dissipation in lighting industry, electronics industry, shipbuilding industry and other fields is light weight evolution, high power density, enhanced weather resistance and long life expectancy. The materials of related radiators in the above fields are gradually transitioning to light alloys such as aluminum, magnesium, titanium and alloys; although the thermal conductivity of these light alloys is good, considering the high activity and easy oxidation of aluminum, magnesium and alloys And the connection corrosion problem that titanium alloys are prone to occur in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/26C25D11/30C25D13/04C25D15/00
CPCC25D11/06C25D11/026C25D11/26C25D11/30C25D13/04C25D15/00
Inventor 李洪涛蒋百铃邵炼炼顾信吴明
Owner NANJING UNIV OF TECH
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