Treatment liquid and method or preparing Ti/Zr-containing yellow passive film on surface of aluminum alloy

A technology of aluminum alloy surface and yellow passivation film, which is applied in the coating process of metal materials, etc., can solve the problems of film forming speed and processing cost gap, complex process, high processing temperature, etc., and achieve improved corrosion resistance and easy film formation The effect of excellent quality and protection performance

Inactive Publication Date: 2011-02-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 coatings are colorless or light blue, which is difficult to identify with the naked eye, which is not conducive to online judgment in production; 2) The processing temperature is high and the process is complicated. Compared with traditional chromate treatment, there is a huge gap in film formation speed and treatment cost
Although Chinese patent 200610046292 discloses a treatment solution that can obtain a golden yellow titanium-zirconium conversion film on the surface of an aluminum alloy, heating is required during the preparation of the conversion treatment solution, and the solution preparation time is long (0.5 hours to 4 hours), and the patent No mention of the preparation method of the chemical conversion film

Method used

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  • Treatment liquid and method or preparing Ti/Zr-containing yellow passive film on surface of aluminum alloy
  • Treatment liquid and method or preparing Ti/Zr-containing yellow passive film on surface of aluminum alloy
  • Treatment liquid and method or preparing Ti/Zr-containing yellow passive film on surface of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: 6063 aluminum alloy profile (thickness 3mm) surface coloring titanium zirconium conversion treatment

[0047] The process for preparing a yellow chemical passivation film containing Ti / Zr on the surface of an aluminum alloy comprises the following steps:

[0048] (1) Pretreatment: ① Cut 6 samples of 30×30mm from 6063 large-size aluminum alloy profiles (thickness 3mm) and punch holes, polish the surface of the aluminum alloy to 1000# with SiC water sandpaper, and clean the surface with tap water. The object is cleaned and dried, and the aluminum wire is connected at the perforated place; ②Immerse the sample piece in an alkaline solution at 50°C for 2 minutes, and then rinse it with deionized water for later use. The components in the alkaline solution The concentration is sodium hydroxide 50g / L, anhydrous sodium carbonate 5g / L; ③Immerse the sample in a mixed acid solution at 25°C for 1min, then rinse it with deionized water, and dry it with a hair dryer for la...

Embodiment 2

[0065] Example 2: 6063 aluminum alloy profile (thickness 3mm) surface coloring titanium zirconium conversion treatment

[0066] A method for chemical conversion treatment of titanium and zirconium on the surface of an aluminum alloy, comprising the following steps:

[0067] (1) Pretreatment: ① Cut 6 samples of 30×30mm from 6063 large-size aluminum alloy profiles (thickness 3mm) and punch holes, polish the surface of the aluminum alloy to 1000# with SiC water sandpaper, and clean the surface with tap water. ②Immerse the sample piece in an alkaline solution at 45°C for 3 minutes, and then rinse it with deionized water for later use. The concentration of each component in the alkaline solution is sodium hydroxide 40g / L , anhydrous sodium carbonate 5g / L; ③Immerse the sample in a mixed acid solution at 25°C for 1min, then rinse it with deionized water, and dry it with a hair dryer for later use. The composition of the mixed acid solution is nitric acid 10%wt, phosphoric acid 2.5%w...

Embodiment 3

[0081]Example 3: 6063 aluminum alloy profile (thickness 3mm) surface coloring titanium zirconium conversion treatment

[0082] A method for chemical conversion treatment of titanium and zirconium on the surface of an aluminum alloy, comprising the following steps:

[0083] (1) Pretreatment is the same as in Example 1.

[0084] (2) Preparation of a treatment solution containing a Ti / Zr yellow passivation film on the surface of an aluminum alloy: 100 ml of a colored titanium-zirconium conversion treatment solution was prepared, wherein the various components and concentrations in the treatment solution were as follows: fluorotitanic acid 2.0 g / L; Fluorozirconic acid 2.0g / L; manganese salt 5.0g / L; organic acid 2.0g / L. Dissolve each component: 0.2 g of fluotitanic acid; 0.2 g of fluozirconic acid; 0.5 g of manganese salt; 0.2 g of organic acid in water, adjust the pH value of the solution to 3.0, and add water until the volume of the treatment solution is 100 ml. After the solut...

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Abstract

The invention discloses treatment liquid and a method for preparing a Ti / Zr-containing yellow passive film on the surface of an aluminum alloy. Each liter of treatment liquid comprises the following components by weight: 0.5 to 2.0g of fluorotitanic acid, 0.4 to 2.0g of fluorozirconic acid, 2.0 to 5.0g of manganate and 0.5 to 2.0g of organic acid; and the pH value of the treatment liquid is between 2.0 and 3.0. The treatment liquid of the invention does not contain chromium or other toxic substances, conversion treatment is realized without heating, the treatment time is between 5 and 30 minutes, and a yellow Ti / Zr-containing chemical conversion film can be prepared on the surface of the aluminum alloy. The chemical conversion film prepared by the method has high decay resistance and high bonding strength with a substrate, and is treated at room temperature by a simple process; and the coating does not contain hexavalent or trivalent chromium which is harmful to environment and human bodies.

Description

technical field [0001] The invention relates to a chemical conversion treatment method for the surface of an aluminum alloy, in particular to a treatment solution and a method for preparing a Ti / Zr-containing yellow passivation film on the surface of an aluminum alloy, which can obtain a uniform thickness and a dense yellow Ti-containing film on the surface of the aluminum alloy / Zr composite chemical conversion coating to replace the traditional chromate conversion treatment. Background technique [0002] Aluminum alloy has become the second largest metal material in use after steel. Under atmospheric conditions, aluminum alloys can form a very thin oxide film on the surface to avoid corrosion. However, this spontaneous oxide film is easy to be damaged, especially in the environment containing Cl-, it is very prone to various damages such as pitting corrosion, crevice corrosion, and stress corrosion. In order to overcome the shortcomings of aluminum alloy surface properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/36
Inventor 李文芳刘宁华杜军
Owner SOUTH CHINA UNIV OF TECH
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