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A method for sealing holes of anodized aluminum of electrified railway catenary components with silane coupling agent

A technology of silane coupling agent and anodic aluminum oxide, which is applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., which can solve the problems of easy powder frost, high energy consumption of boiling water sealing holes, and harsh requirements of boiling water sealing process conditions And other issues

Inactive Publication Date: 2019-01-29
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The process conditions for sealing holes in boiling water are demanding, and powder frost is prone to appear, which affects the appearance of the product. In addition, the energy consumption of sealing holes in boiling water is relatively large; nickel ions and fluoride are mainly used for metal hole sealing at room temperature, which is easy to pollute the environment. The maintenance of liquid is also more troublesome; for the dichromate sealing technology, due to the strong toxicity of hexavalent chromium, it has already been banned in Europe. Processing has become the development trend of the future

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  • A method for sealing holes of anodized aluminum of electrified railway catenary components with silane coupling agent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] First, the anodized aluminum sample was ultrasonically treated in acetone solution for 10 minutes, then rinsed with distilled water for 3 times, then placed in hydrogen peroxide activation solution (the mass fraction of hydrogen peroxide was 5%), soaked at 65°C for 5 minutes, and the sample The surface is rich in a large number of hydroxyl groups; the silane coupling agent (γ-glycidyl etheroxypropyltrimethoxysilane, A-187), methanol and water are mixed in a fixed ratio of 1:8:1 by mass, and then a small amount of Acetic acid adjusts the pH value of the silane coupling agent alcohol aqueous solution to 4, and the hydrolysis time is controlled to 3 hours; soak the activated sample in the silane coupling agent A-187 alcohol aqueous solution for 10 minutes, and then take it out. Curing at room temperature to obtain a sealed sample. The neutral salt spray test of this sample can reach 800 hours without obvious rust spots, and the contact angle of water on its surface is 105°...

example 2

[0020] Firstly, the anodized aluminum sample was ultrasonically treated in acetone solution for 15 minutes, then rinsed with distilled water for 3 times, then put it into hydrogen peroxide activation solution (the mass fraction of hydrogen peroxide was 5%), soaked at 65°C for 8 minutes, and made the sample The surface is rich in a large number of hydroxyl groups; the silane coupling agent (methyltrimethoxysilane, Z-6070), methanol and water are miscible at a fixed ratio of 1:6:1 by mass, and then a small amount of acetic acid is added to adjust the silane coupling agent The pH value of the alcohol aqueous solution reaches 4, and the hydrolysis time is controlled at 5 hours; soak the activated sample in the alcohol aqueous solution of silane coupling agent Z-6070 for 50 minutes, then take it out, and solidify at a constant temperature of 60°C to obtain Sealed samples. The neutral salt spray test of this sample can reach 950 hours without obvious rust spots, and the surface has ...

example 3

[0022] First, the anodized aluminum sample was ultrasonically treated in acetone solution for 15 minutes, then rinsed with distilled water for 5 times, then put it into hydrogen peroxide activation solution (the mass fraction of hydrogen peroxide was 5%), soaked at 65°C for 10 minutes, and made the sample The surface is rich in a large number of hydroxyl groups; the silane coupling agent (methyltrimethoxysilane, Z-6070), methanol and water are miscible at a fixed ratio of 1:6:1 by mass, and then a small amount of acetic acid is added to adjust the silane coupling agent The pH value of the alcohol aqueous solution reaches 4, and the hydrolysis time is controlled at 8 hours; soak the activated sample in the alcohol aqueous solution of silane coupling agent Z-6070 for 80 minutes, then take it out, and solidify at a constant temperature of 60°C to obtain Sealed samples. The neutral salt spray test of this sample can reach 1000 hours without obvious rust spots, and the surface has ...

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Abstract

The invention provides a method for carrying out hole sealing treatment on anodic alumina, a component of an overhead contact system of an electric railway, by using a silane coupling agent, belonging to the field of metal surface retreatment and metal corrosion resistance improvement. The method comprises the following steps: firstly carrying out ultrasonic treatment on an anodic alumina sample in an acetone solution for 10-15 minutes, then washing the anodic alumina sample with distilled water for 3-5 times and then soaking the anodic alumina sample in hydrogen peroxide activation liquor at 65 DEG C for 5-10 minutes; mixing the silane coupling agent, alcohol and water in a mass ratio of 1 to (6-8) to 1, then adding an organic acid as a hydrolysis catalyst, and regulating the pH value of a silane coupling agent, alcohol and water solution to 4-6, wherein the hydrolysis time is controlled to be 0.5-8 hours; and soaking the sample subjected to activation treatment in the silane coupling agent, alcohol and water solution for 10-80 minutes and then taking out and curing the sample. The method has the beneficial effects that the method is used for performing sealing treatment on porous anodic alumina film layers, is low in raw material prices and simple in operation procedures and is convenient to maintain; the corrosion resistance and pollution resistance of the product are substantially improved after hole sealing; the product is nontoxic and environmentally friendly; safe operation of the electric railway is ensured.

Description

technical field [0001] The invention relates to a method for sealing holes of anodized aluminum of electrified railway catenary components with a silane coupling agent, and belongs to the technical field of metal surface retreatment and improving metal corrosion resistance. Background technique [0002] Aluminum alloy is the main material constituting the electrified railway network. It is used in the manufacture of various devices and components such as positioning devices, arm support devices, and compensation devices in the catenary. Generally speaking, after metal aluminum and aluminum alloys are anodized in a highly soluble acidic electrolyte, the oxide layer obtained is porous. Although the corrosion resistance of aluminum and aluminum alloys can be improved to a certain extent, its adsorption Strong ability, easy to be polluted, especially in corrosive environments, corrosive media can easily enter the membrane pores and cause corrosion. In order to further improve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/18
CPCC25D11/18
Inventor 肖宁刘莉蓉雍兴跃郭奉迎王贤明
Owner BEIJING UNIV OF CHEM TECH