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Method for preparing corrosion protection abrasion resistant ceramic coating with alloy surface differential arc oxidization

A technology of micro-arc oxidation and ceramic coating, applied in anodizing and other directions, can solve the problems of uncovered coating, production capacity limitation, superposition, etc., and achieve the effect of fast film forming speed and low unit power density

Inactive Publication Date: 2008-09-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for high-power power supply when processing large-area aluminum alloy components at one time, it puts great pressure on the power grid, and at the same time, the production capacity is also greatly limited
If a component with a surface area greater than 2 square meters is divided into multiple areas, the above-mentioned patented technology is used to micro-arc oxidize these small areas one by one, so as to achieve the method of preparing coatings by micro-arc oxidation on a large area, near the boundary of the small area division It may cause partial uncovering or superposition of coatings, and it will be difficult to guarantee the uniformity of the overall surface

Method used

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  • Method for preparing corrosion protection abrasion resistant ceramic coating with alloy surface differential arc oxidization

Examples

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Effect test

Embodiment 1

[0021] Example 1: Treat a batch of LY12 aluminum alloy components with a total internal and external surface area of ​​0.3 square meters

[0022] A method for preparing an anti-corrosion and anti-wear ceramic coating by micro-arc oxidation on the surface of an aluminum alloy, comprising the following steps and process conditions:

[0023] (1) Prepare electrolyte: prepare 100L electrolyte solution, electrolyte composition: sodium silicate 50g / L, sodium hydroxide 5g / L, organic amine 5ml / L (among which ethylenediamine accounts for 50%, triethanolamine accounts for 50%) And other auxiliary additives 11g / L (among them, ethylenediaminetetraacetic acid disodium salt 2g / l, borax 5g / l, sodium tungstate 3g / l and sodium tripolyphosphate 1g / l).

[0024] (2) Set the electrical parameters of the power supply: the output of the power supply is an asymmetrical AC pulse, the minimum voltage is set to -500V, and the pulse height is controlled by the current size: the maximum current is set to 3...

Embodiment 2

[0027] Example 2: processing a batch of LY12 aluminum alloy components with a total internal and external surface area of ​​0.3 square meters

[0028]A method for preparing an anti-corrosion and anti-wear ceramic coating by micro-arc oxidation on the surface of an aluminum alloy, comprising the following steps and process conditions:

[0029] (1) Prepare electrolyte: prepare 100L electrolyte solution, electrolyte composition: sodium silicate 50g / L, sodium hydroxide 5g / L, organic amine 5ml / L (among which ethylenediamine accounts for 50%, triethanolamine accounts for 50%) And other auxiliary additives 11g / L (among them, ethylenediaminetetraacetic acid disodium salt 2g / l; borax 5g / l; sodium tungstate 3g / l; sodium tripolyphosphate 1g / l).

[0030] (2) Set the electrical parameters of the power supply: the output of the power supply is an asymmetrical AC pulse, the minimum voltage is set to -500V, and the pulse height is controlled by the current size: the maximum current is set to ...

Embodiment 3

[0034] Embodiment 3: processing a batch of LY12 aluminum alloy components, the total internal and external surface area is 0.3 square meters

[0035] A method for preparing an anti-corrosion and anti-wear ceramic coating by micro-arc oxidation on the surface of an aluminum alloy, comprising the following steps and process conditions:

[0036] (1) Configure electrolyte: configure 100L of electrolyte solution, and the electrolyte components are: sodium silicate 50g / L; sodium hydroxide 5g / L; organic amine 5ml / L, wherein ethylenediamine accounts for 50%, and triethanolamine accounts for 50%; Other auxiliary additives 11g / L (among them, disodium ethylenediaminetetraacetic acid 2g / l; borax 5g / l; sodium tungstate 3g / l; sodium tripolyphosphate 1g / l).

[0037] (2) Set the electrical parameters of the power supply: the output of the power supply is an asymmetrical AC pulse, the minimum voltage is set to -500V, and the pulse height is controlled by the current size: the maximum current s...

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Abstract

The invention discloses a method for preparing an antisepsis and antiwear ceramics coating layer on the surface of alloy through microarc oxidation. The method includes three steps of collocating electrolyte, arranging power electric parameters and microarc oxidation treatment; wherein, the component concentrations of the electrolyte are sodium silicate of 20 to 100g / L, sodium hydroxide of 5 to 10g / L and organic amine additive of 5 to 15ml / L; the current density of unit area is 50 to 100A / centiare; the pulse frequency is 100 to 700Hz; the pulse dutyfactor is 20 to 90 percent; the temperature of the electrolyte in the microarc oxidation treatment is not higher than 45 DEG C. The method needs lower unit power density and has fast film forming speed to prepare the ceramics coating layer on the surface of aluminum and magnesium alloys; the method adopts 100KVA power which can treat at least 2 centiares of the surface area of the aluminum alloy for one time; the growing speed of the ceramics coating layer can reach 1 to 1.5 micron / min. The formed ceramics coating layer is uniform and compact; the rigidity of the aluminum alloy can reach 1200 to 1300Hv.

Description

technical field [0001] The invention relates to an anti-corrosion and anti-wear ceramic coating on the surface of an alloy, in particular to a method for preparing an anti-corrosion and anti-wear ceramic coating by micro-arc oxidation on the surface of an alloy. The method has low energy consumption per unit area and is suitable for one-time coating on aluminum and magnesium alloy components The surface is prepared with anti-corrosion and anti-wear ceramic coating on a large area. Background technique [0002] Micro-arc oxidation preparation of aluminum, magnesium, titanium alloy surface ceramic coating technology is under the action of high voltage, the insulating layer is broken down, and a micro plasma environment is formed on the surface of the workpiece. In such an environment, surface electrochemical reactions, plasma-assisted reactions, and physical metallurgical processes occur simultaneously, and finally a dense and firm ceramic coating is formed in situ on the surf...

Claims

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Application Information

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IPC IPC(8): C25D11/02C25D11/04C25D11/30
Inventor 李文芳彭继华
Owner SOUTH CHINA UNIV OF TECH
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