Secondary anodic oxidation treatment method used for aluminum alloy and capable of forming grain boundary pattern

A technology of secondary anodizing and treatment methods, which is applied in the direction of anodizing, electrolytic coating, surface reaction electrolytic coating, etc., which can solve the problems of difficult control, insufficient fineness and limitation of pattern edges, etc. The boundary is clear and the effect of mass production is satisfied

Inactive Publication Date: 2018-03-02
CHANGHONG PRECISION TOOL DONGGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can achieve the appearance effect with a specific design pattern, but it is limited by the silk screen printing process, it is not suitable for application on complex curved surfaces, and the edge of the pattern is not fine enough, so it can only be used in occasions that do not require high appearance; in addition, the ink requirements High temperature and strong acid and alkali resistance, easy to remove, the actual production is often difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The base material is 6063 aluminum, the average grain size is 2.3 mm, and the grain boundary color is the natural color of anodized film, and the grain color is blue-black.

[0023] The specific implementation steps are as follows:

[0024] a. The first polishing: Polish and clean the surface of the aluminum alloy substrate to make it appear mirror-like, and the surface roughness is less than 0.040 microns.

[0025] b. Grain boundary etching: perform selective chemical etching on the grain boundary of the substrate, followed by water washing, neutralization, and water washing in sequence. The ratio of etching potion is: sulfuric acid: deionized water = 1:1 (v / v), and the concentration of aluminum ions is 5g / l. The etching temperature is 90°C and the time is 60min. Neutralization conditions are: 1% sodium carbonate solution, room temperature, time 30 seconds. After treatment, the surface of the material presents an obvious grain boundary pattern. The average depth and...

Embodiment 2

[0033] The base material is 6063 aluminum, the average grain size is 2.3 mm, and the grain boundary color is the natural color of anodized film, and the grain color is blue-black. Implementation steps are the same as in Example 1. The ratio of etching solution is sulfuric acid: deionized water = 1:3 (v / v), the concentration of aluminum ions is 5g / l, the etching temperature is 90°C, and the etching time is 60min. After treatment, the surface of the material presents an obvious grain boundary pattern. The average depth and average width of the grain boundary grooves measured by Sensofar-Tech's 3D optical profiler are 20.9 microns and 34.1 microns respectively, and the grain surface is only slightly eroded , still bright.

specific Embodiment 3

[0034] The base material is 6063 aluminum, the average grain size is 2.3 mm, and the grain boundary color is the natural color of anodized film, and the grain color is blue-black. Implementation steps are the same as in Example 1. The ratio of etching potion is sulfuric acid: phosphoric acid: deionized water = 1:3:4 (v / v). The etching temperature is 90°C and the time is 60min. After treatment, the surface of the material showed obvious grain boundary patterns. The average depth and average width of grain boundary grooves measured by Sensofar-Tech's 3D optical profiler were 47.4 microns and 88.7 microns, and the grain surface was only slightly eroded , still bright.

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Abstract

The present invention provides a secondary anodic oxidation treatment method used for an aluminum alloy and capable of forming a grain boundary pattern. The secondary anodic oxidation treatment methodcomprises: a, first polishing: polishing the surface of an aluminum alloy substrate, and cleaning; b, grain boundary etching; c, first anodic oxidation; d, second polishing: polishing the substrate,and cleaning, wherein the anodic oxidation film on the surface is uniformly removed, the bottom layer substrate is barely exposed, and the oxidation film on the inner wall of the concave groove of thegrain boundary is retained; and e, second anodic oxidation: carrying out second anodic oxidation treatment on the substrate, wherein a layer of an oxidation film with a required color is formed on the substrate surface area excluding the concave groove of the grain boundary, ie., the grain surface. According to the present invention, by adjusting the related molding process parameters, the grainsize of the material can be subjected to controlled distribution while the sizes and the shapes of each grain are different, such that the whole pattern is unique.

Description

technical field [0001] The invention belongs to the technical field of alloy surface treatment, and in particular relates to a secondary anodic oxidation treatment method for an aluminum alloy with a grain boundary pattern. Background technique [0002] Aluminum alloys are widely used as structural parts of mobile phones, watches, computers and other products. These structural parts are often subjected to anodic oxidation treatment, the purpose is to enhance the reliability of the product surface such as corrosion resistance and hardness, but also to endow the surface with high-quality decorative properties. In aluminum alloy anodizing treatment, secondary anodizing is often applied, because two different appearance effects can be formed on the same surface, which significantly improves the decorative performance of the product. [0003] In the current market, the frames of some smartphones are anodized first, then cut to remove the oxide film with CNC tools, and then anodi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/08C25D11/12C25D11/16C23F1/20
Inventor 陈云江占魁
Owner CHANGHONG PRECISION TOOL DONGGUAN CO LTD
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