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Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof

A technology of film-forming liquid and aluminum alloy, which is applied in the coating process of metal materials, etc., can solve the problems of different substrate properties, unusability, and different treatment processes, and achieve improved anti-corrosion performance, convenient production control, and low concentration. Effect

Inactive Publication Date: 2012-01-04
GUANGXI UNIV FOR NATITIES
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AI Technical Summary

Problems solved by technology

However, as we all know, the properties of the substrate are different, and the treatment process is also different. Therefore, the process of trivalent chromium conversion coating on the surface of galvanized steel cannot be used for the surface treatment of aluminum alloy.
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 The early Chinese patent "Preparation Method of Trivalent Chromium Chemical Conversion Coating on Aluminum or Aluminum Alloy" (Application No. 200710034656.5 Application Date 2007-03-30) has a single component in the conversion coating and its anti-corrosion performance needs to be improved

Method used

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  • Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof
  • Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof
  • Preparation method of aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof

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Experimental program
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Effect test

Embodiment 77075

[0063] Embodiment 77075 aluminum alloy trivalent chromium chromization

[0064] 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 10KGRidoline212, then diluted to 450L with deionized water, PH control in the range of 7-8, mix well.

[0065] B. Build a 450L activation bath: Please clean the container thoroughly before building the bath. For new containers or new production lines, first clean them with 10% sulfuric acid solution, then clean them with water, and add the required 16KG of sodium hydroxide. Then dissolve it with deionized water and dilute it to 450L with deionized water, and stir evenly. The temperature was maintained at 18°C.

[0066] C. Build a 450L chromium bath: Please clean the container thoroughly before building the bath. ...

Embodiment 8

[0071] Example 8 Trivalent Chromium Chromization of Aluminum Alloy Die Castings

[0072] A. Build a 300L 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 60L of water, and then add Henkel's degreasing powder Ridoline 2126KG is released to 300L, then diluted to 300L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0073] B. Build a 300L 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 8KG of sodium hydroxide, Then dissolve it with deionized water and dilute it to 300L with deionized water, and mix well. The temperature was maintained at 28°C.

[0074] C. Build a 300L chromium bath: Please clean the contai...

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Abstract

The invention discloses a preparation method of an aluminum alloy trivalent chromium hybridization conversion film and film-forming liquid thereof. Bivalent cobalt salt used as an inorganic corrosion inhibitor and ethanolamine used as an organic corrosion inhibitor are added into the film-forming liquid, and the obtained film-forming liquid is used to treat an aluminum or aluminum alloy workpiece to form a trivalent chromium hybridization conversion film on the surface of the aluminum alloy. Compared with the single trivalent chromium conversion film, by adopting the aluminum alloy trivalent chromium hybridization conversion film provided by the invention, the corrosion resistance of the aluminum alloy can be improved, and the corrosion resistant effect of the hexavalent chromium chemical conversion film can be realized.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to a method for preparing an aluminum alloy trivalent chromium hybrid conversion film 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. Because they...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 余会成雷福厚黄小小邓光辉谭学才韦冬萍
Owner GUANGXI UNIV FOR NATITIES
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