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Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof

A technology of film-forming liquid and aluminum alloy, applied in the direction of metal material coating process, etc., can solve the problems that the anti-corrosion performance needs to be improved, can not satisfy customers, and the performance of the substrate is different, so as to improve the color and anti-corrosion performance, and facilitate production. Controlled, low-cost effects

Inactive Publication Date: 2013-02-06
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, different substrates have different properties, and the process of trivalent chromium conversion coating on the surface of galvanized steel cannot be used for aluminum alloy treatment.
At present, there are reports on trivalent chromium-aluminum alloy conversion coatings, such as the Chinese patent "Aluminum alloy surface rapid film-forming solution at room temperature and its use method" (application number 200710017506.3 application date 2007-03-15) of Xi'an University of Architecture and Technology, and the inventor In 2011, the Chinese patent "Preparation method of trivalent chromium composite conversion coating on aluminum alloy and its film-forming solution" (application number: 201110068950.4, application date: 2011-03-22), the color of the conversion coating is only green, which cannot satisfy customers For the requirements of other colors, the composition is also single, and the anti-corrosion performance needs to be improved

Method used

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  • Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof
  • Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof
  • Method of preparing aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Trivalent chromium chromization of 2024 aluminum alloy

[0016] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreasing agent 10KG Ridoline212, and then diluted to 450L with deionized water, the pH is controlled within the range of 7 to 8, and mixed evenly.

[0017] B. Building an activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 3kg of sodium hydroxide, and then Dissolve with deionized water and then dilute to 450L with deionized water, mix well. The temperature was maintained at 10°C.

[0018] C. Build a 450L chromium bath: Please clean the container thoroughly before ...

Embodiment 2

[0023] Example 2 Trivalent chromium chromization of 3003 aluminum alloy

[0024] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreaser 8KGRidoline212, then diluted to 450L with deionized water, pH control in the range of 7-8, mix well.

[0025] B. Building an activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 6KG of sodium hydroxide, and then Dissolve with deionized water and then dilute to 450L with deionized water, mix well. The temperature was maintained at 40°C.

[0026] C. Build a 450L chromium bath: Please clean the container thoroughly before building the bath. For new containers ...

Embodiment 4

[0039] Example 4 Trivalent chromium chromization of 5052 aluminum alloy

[0040] A. Build a 450L degreasing bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 10% sulfuric acid solution, then wash with water twice, each time with 100L of water, and then add Henkel's degreaser 8KGRidoline212, then diluted to 450L with deionized water, pH control in the range of 7-8, mix well.

[0041] B. Build a 450L activation bath: Please clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 10% sulfuric acid solution, then clean it with water, add the required 12KG of sodium hydroxide, Then dissolve it with deionized water and dilute it to 450L with deionized water, and mix well. The temperature was maintained at 30°C.

[0042] C. Build a 450L chromium bath: Please clean the container thoroughly before building the bath. For new containers...

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Abstract

The invention discloses a method of preparing an aluminum alloy dark green trivalent chromium conversion film and film-forming liquid thereof. The method comprises the following steps: adding copper salt and organic vinyl pyridines in the film-forming liquid; and using the film-forming liquid to process aluminum or aluminum alloy workpieces so that a dark green trivalent chromium conversion film can be formed on the surface of the aluminum alloy. Compared with a trivalent chromium conversion film with a single film layer, the application of the aluminum alloy dark green trivalent chromium conversion film can satisfy the requirement on dark green color tone, the anti-corrosion performance of the aluminum alloy is improved, and the anti-corrosion effect of a hexavalent chromium chemical conversion film can be achieved.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to a method for preparing a dark green trivalent chromium conversion film on aluminum alloy and a film-forming solution thereof. Background technique [0002] In order to improve the corrosion resistance of aluminum and other metals such as zinc and steel, the traditional method is to use hexavalent chromium conversion coating. However, hexavalent chromium is toxic. In the electrical and electronic industries, the EU RoHS regulations (Restriction of Hazardous Substances, "Instructions on Restricting the Use of Certain Hazardous Components in Electrical and Electronic Equipment") prohibit the use of hexavalent chromium compounds. In order to meet the needs of environmentally friendly processes, various hexavalent chromium-free conversion coatings have been developed. Recent research involves new conversion coatings such as titanium, tungsten, tin, zinc and rare earth salts. Becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 余会成黄学艺雷福厚谭学才韦贻春陈其锋
Owner GUANGXI UNIV FOR NATITIES
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