Method for ceramization of aluminum alloy surface

a ceramization and aluminum alloy technology, applied in the field of aluminum alloy surface ceramization, can solve the problems of low-zone coating foaming, high cost, complex process and equipment, etc., and achieve good adsorption capacity, good elasticity, and good corrosion resistance.

Inactive Publication Date: 2019-10-17
CITIC DICASTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]The advantages of the method according to the present invention are as follows: (1) good corrosion resistance, good elasticity and insulation; (2) the coating being similar to plastic, with enamel-like luster and attractive appearance; and (3) good adsorption capacity, capability of being dyed with different colors, and good decorative effect.

Problems solved by technology

The vacuum coating and coating process requires multiple times of long-time baking for multiple times of film formation, so the process and equipment are complicated and the cost is high.
The conventional electroplating process has many shortcomings: 1, a polishing process is needed before electroplating; 2, the entire product surface is an electroplating layer by first electroplating, and the electroplating cost and the polishing cost are relatively expensive, so the raw material cost and the processing cost are both higher; 3, multiple times of baking is required during coating, which may result in foaming of a low-zone coating and high rejection rate; 4, after the electroplating, the rim should be adhered with special tape paper and then coated, wherein the tape paper is very high in cost and should be manually removed after the coating; 5, since the entire product surface needs to be electroplated, a low zone phenomenon occurs, and the electroplating qualification rate is low; 6, the de-plating repair cost is high, and the entire product needs to be completely de-plated and then re-plated; and 7, the nickel pre-plating step takes a long time, which results in a longer total time of the entire electroplating process.

Method used

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  • Method for ceramization of aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0018]1. Test Equipment

[0019]Heat, acid and alkali resistant plastic tank: 30 L; rectifier (oxidation power supply): 200A / 100V.

[0020]Plate: lead and lead-bismuth alloy plates; poles and wires: copper bars, copper wires

[0021]Material: aluminum alloy hub.

[0022]2. Dosing

[0023]1. Chromic acid and boric acid method (prepare 30 L solution)

[0024]Weigh 1120 g (40 g / L) of industrial-grade chromic anhydride and 84 g (3 g / L) of industrial-grade boric acid, dissolve into distilled water respectively, then add into a 30 L tank, and add distilled water to a prescribed volume for later use. In this method, the current density during electroplating process is 0.5-1.0 A / dm2.

[0025]2. Anodization and Anodization Post-Treatment

[0026]Heat with a heater, stir with compressed-air and hang anode plates bilaterally for oxidation under stable voltage, and fill with distilled water of about 90° C. for 30-60 minutes after anodization.

[0027]3. Process Test and Results

[0028]The method (FIG. 1) comprises the step...

embodiment 2

[0035]The method of this embodiment differs from Embodiment 1 in a step of rinsing the aluminum alloy surface under a high pressure water gun between steps 4 and 5, the water pressure of the high pressure water gun being 1360 Bar, and the rinsing time being 45 seconds.

[0036]In this embodiment, the following three dyeing conditions are taken:

[0037]A: dyeing at 28° C. for 7 minutes using a blue dyeing solution containing 30 g / L of potassium ferrocyanide and 40 g / L of potassium chloride.

[0038]B: dyeing at 28° C. for 7 minutes using a black dyeing solution containing 75 g / L of cobalt acetate and 22 g / L of potassium permanganate.

[0039]C: dyeing at 28° C. for 7 minutes using a white dyeing solution containing 30 g / L of lead acetate and 30 g / L of sodium sulfate.

embodiment 3

[0040]In this embodiment, the six surfaces obtained in Embodiments 1 and 2 were subjected to a copper accelerated acetic acid spray test respectively. The test was carried out in accordance with the methods described in GMW 14458:2011 (General Motors Worldwide Copper-Accelerated Acetic Acid Salt Spray (CASS) Test) and GMW 14729:2012 (General Motors Worldwide High Humidity Test). The results of samples were evaluated after exposure for 250, 500, 1000, 1250 and 1500 hours, and the results were shown in Table 1. The experiment was carried out in (SF2000SF2000SF2000)7# salt spray test chamber salt, and the test was completed by the Test Center of CITIC Daika Co., Ltd.

[0041]It can be seen from Table 1 that all the surfaces passed the CASS test of 1250 hours after the high pressure rinsing step was introduced in Embodiment 2, and had better protection capability.

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Abstract

The present invention provides a method for ceramization of an aluminum alloy surface, comprising the steps of: (1) providing a clean aluminum alloy surface; (2) pre-polishing; (3) etching; (4) polishing; and (5) performing ceramic oxidation. The advantages of the method are as follows: (1) good corrosion resistance, good elasticity and insulation; (2) the coating being similar to plastic, with enamel-like luster and attractive appearance; and (3) good adsorption capacity, capability of being dyed with different colors, and good decorative effect etc.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority to Chinese Patent Application No. 201810327696.7, entitled METHOD FOR CERAMIZATION OF ALUMINUM ALLOY SURFACE and filed on Apr. 12, 2018, which is incorporated herein by reference for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a surface treatment method for an alloy, specifically to a method for ceramization of an aluminum alloy surface.BACKGROUND OF THE INVENTION[0003]The surface of an aluminum alloy hub is generally treated by coating, vacuum coating, electroplating, etc., which not only plays a role in surface protection but also plays a decorative role. The vacuum coating and coating process requires multiple times of long-time baking for multiple times of film formation, so the process and equipment are complicated and the cost is high. At present, electroplating and coating combined wheel processes for aluminum hubs adopt the method of first electroplating and then coatin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D9/06C25D5/44
CPCC25D9/06C25D5/44C25D11/08C25D11/16C25D11/24
Inventor HAN, DEYU
Owner CITIC DICASTAL
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