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Treatment solution and treatment method for preparing golden cryolite conversion film on surface of aluminum alloy

A technology of aluminum alloy surface and treatment method, applied in the direction of metal material coating process, etc., can solve the problems of film forming speed and treatment cost gap, unfavorable online judgment, promotion and application limitations, etc., to achieve good bonding force, which is conducive to online judgment. , The effect of film surface densification

Inactive Publication Date: 2011-11-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these patented technologies have certain practical prospects, the above-mentioned patented technologies have the following shortcomings, which limit their wide application in production
Its disadvantages are mainly as follows: 1) Most of the titanium-zirconium conversion coating is colorless, which is difficult to identify with the naked eye, which is not conducive to online judgment in production; 2) The treatment temperature is high and the process is complicated, compared with traditional chromate treatment , there is a huge gap between film forming speed and processing cost

Method used

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  • Treatment solution and treatment method for preparing golden cryolite conversion film on surface of aluminum alloy
  • Treatment solution and treatment method for preparing golden cryolite conversion film on surface of aluminum alloy
  • Treatment solution and treatment method for preparing golden cryolite conversion film on surface of aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Example 1: Preparation of golden yellow organic-inorganic composite conversion film on the surface of 6063 aluminum alloy

[0076] The process for preparing a golden-yellow cryolite organic-inorganic composite chemical conversion film on the surface of an aluminum alloy includes the following steps:

[0077] (1) Pretreatment: ① Take 6 samples of 30×30mm from 6063 large-size aluminum alloy profiles (thickness 3mm), grind the samples step by step with 600# and 800# water sandpaper, and clean them with deionized water; ② Put the aluminum alloy treated by ① into the mixed acid solution (H 2 SO 4 10% wt, H 3 PO 4 10%wt, HF 2 %wt) for 2 minutes, rinse with deionized water; ③ put the aluminum alloy treated in ② into the mixed alkali solution (NaOH 10%wt, NaOH 2 CO 3 15%wt) for 1 minute, rinse with deionized water.

[0078] (2) Preparation of treatment solution for preparing golden cryolite organic-inorganic composite conversion coating on the surface of aluminum allo...

Embodiment 2

[0081] Example 2 : Preparation of golden yellow organic-inorganic composite conversion coating on the surface of 6063 aluminum alloy

[0082] The process for preparing a golden-yellow cryolite organic-inorganic composite chemical conversion film on the surface of an aluminum alloy includes the following steps:

[0083] (1) Pretreatment: ① Take 6 samples of 30×30mm from 6063 large-size aluminum alloy profiles (thickness 3mm), grind the samples step by step with 600# and 800# water sandpaper, and clean them with deionized water; ② Put the aluminum alloy treated by ① into the mixed acid solution (H 2 SO 4 30%wt, H 3 PO 4 5%wt, HF 1%wt) for 1 minute, rinse with deionized water; ③ put the aluminum alloy treated in ② into a mixed alkali solution (NaOH 5%wt , NaOH 2 CO 3 20%wt) for 2 minutes, rinse with deionized water.

[0084] (2) Preparation of treatment solution for preparing golden cryolite organic-inorganic composite conversion coating on aluminum alloy surface: 5.0...

Embodiment 3

[0087] Example 3 : Preparation of golden yellow organic-inorganic composite conversion coating on the surface of 6063 aluminum alloy

[0088] The process for preparing a golden-yellow cryolite organic-inorganic composite chemical conversion film on the surface of an aluminum alloy includes the following steps:

[0089] (1) Pretreatment: ① Take 6 samples of 30×30mm from 6063 large-size aluminum alloy profiles (thickness 3mm), grind the samples step by step with 600# and 800# water sandpaper, and clean them with deionized water; ② Put the aluminum alloy treated by ① into the mixed acid solution (H 2 SO 4 20%wt, H 3 PO 4 20%wt, HF 5%wt) for 2 minutes, rinse with deionized water; ③ put the aluminum alloy treated in ② into the mixed alkali solution (NaOH 10%wt, NaOH 2 CO 3 15%wt) for 3 minutes, rinse with deionized water.

[0090] (2) Preparation of treatment solution for preparing golden cryolite organic-inorganic composite conversion coating on the surface of aluminu...

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Abstract

The invention discloses a treatment solution and a treatment method for preparing a golden cryolite conversion film on the surface of aluminum alloy. The composite conversion film prepared by the invention has a double-layer structure: an outer layer mainly containing organic complexes and an inner layer mainly containing Na3AlF6. The treatment solution comprises the following components in concentration: 1-5.0 g / L fluotitanic acid, 0.5-5.0 g / L fluorozirconic acid, 1-5.0 g / L tannic acid, 2-5.0 g / L film-forming accelerator fluoride and 2-5.0 g / L manganese salt; and the treatment solution is regulated with a base until the pH value is 3.0-5.0. The treatment solution disclosed by the invention is free of chromium and other toxic substances; the conversion and treatment process does not need heating and has the advantages of short treatment time, room-temperature treatment and simple process; and the chemical conversion film prepared by the treatment method has the advantages of excellentcorrosion performance, high binding strength with a base body, and no hexavalent or trivalent chromium harmful to environment and human bodies.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy corrosion and protection, in particular to a treatment liquid and a treatment method for preparing a golden cryolite conversion film on the surface of an aluminum alloy. Under the electron microscope, it is in the shape of pebbles or cubes, and the obtained conversion coating has excellent corrosion resistance, and the film layer is golden, which is conducive to the realization of online judgment. Background technique [0002] Aluminum alloy has a series of advantages such as low density, strong electrical and thermal conductivity, excellent mechanical properties and good machinability, and has been widely used in the national economy. However, the corrosion resistance of aluminum is poor. Although a dense and hard aluminum oxide film can be formed in the air, this layer of natural oxide film is relatively thin (thickness is 1~3nm). It is easy to cause corrosion of aluminum and its alloys....

Claims

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Application Information

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IPC IPC(8): C23C22/34
Inventor 易爱华李文芳杜军穆松林
Owner SOUTH CHINA UNIV OF TECH
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