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Surface treatment process for anodizing aluminum products

A technology of anodizing and surface treatment, applied in the direction of anodizing, can solve the problems of large porosity, poor mechanical properties, can not effectively prevent corrosion, etc., to achieve the effect of improving mechanical strength

Inactive Publication Date: 2012-05-30
张家港市华杨金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is well known that aluminum products will be oxidized in the air. The natural oxidation on the surface of aluminum is amorphous, which will make the surface of aluminum metal lose its original luster, although this layer of natural oxide film will slightly passivate the metal. , but it is very thin, about 4-5nm, and has a large porosity and poor mechanical properties, which cannot effectively prevent further corrosion of aluminum metal by various media in the atmosphere

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Surface pretreatment: neutralization, water cleaning;

[0016] Anodizing treatment: degreasing treatment of aluminum products through acid-base solution at room temperature; then washing in hot pure water at 55°C; placing aluminum products as anodes in electrolytic sulfuric acid solution, at 35A, 58°C, pH value Perform yin and yang electrolysis within the condition range of 1.7; wash with pure water and hot water at 56°C; then dry and collect;

[0017] Package.

Embodiment 2

[0019] Surface pretreatment: neutralization, water cleaning;

[0020] Anodizing treatment: degreasing treatment of aluminum products through acid-base solution at room temperature; then washing in hot pure water at 65°C; placing aluminum products as anodes in electrolytic sulfuric acid solution, at 30A, 56°C, pH value Perform yin and yang electrolysis within the condition range of 1.5; wash with pure water and hot water at 60°C; then dry and collect;

[0021] Package.

Embodiment 3

[0023] Surface pretreatment: neutralization, water cleaning;

[0024] Anodizing treatment: degreasing treatment of aluminum products by acid-base solution at room temperature; then washing in hot pure water at 60°C; placing aluminum products as anodes in electrolytic sulfuric acid solution, at 25A, 60°C, pH value 2. Carry out electrolysis of yin and yang within the condition range of 2; wash with pure water, and wash with hot water at 55°C; then dry and collect;

[0025] Package.

[0026] No matter what method is used to process aluminum materials and products, there will be dirt and defects on the surface to varying degrees, such as dust, metal oxides, natural aluminum oxide films or aluminum oxide films formed at high temperatures, residual oil stains, asphalt marks, and manual handling. Fatty acids and helium-containing compounds, welding fluxes, and corrosion salts are insoluble in cold or hot water washing, but they can be dissolved in acidic solutions, so products that ...

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Abstract

The invention provides surface treatment process for anodizing aluminum products. The surface treatment process includes steps of neutralizing and washing by water; degreasing the aluminum products by acid-base solution at the normal temperature; washing the aluminum products by hot pure water with the temperature ranging from 55 DEG C to 65 DEG C; disposing the aluminum products serving as anodes into electrolytic sulfuric acid solution so that anode and cathode electrolysis is carried out under the conditions of the current ranging from 25A to 35A, the temperature ranging from 55 DEG C to 60 DEG C and the pH (potential of hydrogen) value ranging from 1 to 2; then washing the aluminum products by hot water with the temperature ranging from 55 DEG C to 60 DEG C after washing the same by pure water; and finally drying the aluminum products and collecting the same. Accordingly, a dense film much thicker than a natural oxidation film can be formed on the surface of aluminum and alloy thereof after anodizing treatment, the thickness of the dense film ranges from tens of micrometers to hundreds of micrometers, accordingly, the surface luster of metal can be kept for a long time, both corrosion resistance and mechanical strength of the metal are improved to a certain degree, and decorative appearance of the aluminum products further can be formed by dyeing.

Description

technical field [0001] The invention relates to a surface treatment process, in particular to an aluminum product anodic oxidation surface treatment process. Background technique [0002] No matter what method is used to process aluminum materials and products, there will be dirt and defects on the surface to varying degrees, such as dust, metal oxides (alumina film formed naturally or at high temperature), residual oil stains, asphalt marks, manual handling fingerprints (The main components are fatty acids and helium-containing compounds), welding fluxes and corrosion salts, metal burrs, minor flower scratches, etc. Therefore, before the oxidation treatment, chemical and physical methods are used to clean the surface of the product necessary to expose the pure metal substrate, so as to facilitate the smooth progress of oxidation and coloring, so as to obtain a firm bond with the substrate, meet the requirements of color and thickness, and have Artificial membrane with good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/16C25D11/18
Inventor 黄爱华
Owner 张家港市华杨金属制品有限公司
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