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A kind of preparation method of gray aluminum alloy trivalent chromium composite conversion film and its film-forming solution

A technology of aluminum alloy and film-forming solution, which is applied in the direction of metal material coating technology, etc., can solve the problems of anti-corrosion performance that needs to be improved, cannot satisfy customers, and single composition, so as to improve color and anti-corrosion performance, facilitate production control, The effect of low concentration

Inactive Publication Date: 2011-12-21
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 The early Chinese patent "Preparation method of trivalent chromium chemical conversion coating on aluminum or aluminum alloy" (application number 200710034656.5, application date 2007-03-30), the color of the conversion coating is only green, which cannot meet the customer's requirements for other colors. Also single, anti-corrosion performance also needs to be improved

Method used

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  • A kind of preparation method of gray aluminum alloy trivalent chromium composite conversion film and its film-forming solution
  • A kind of preparation method of gray aluminum alloy trivalent chromium composite conversion film and its film-forming solution
  • A kind of preparation method of gray aluminum alloy trivalent chromium composite conversion film and its film-forming solution

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Experimental program
Comparison scheme
Effect test

Embodiment 56061

[0046] Chromating: Chromizing the workpiece treated in step in the film-forming liquid of the chromizing bath for 10 minutes, cleaning with deionized water for 2 minutes until clean, and then drying at 60°C for 30 minutes to obtain gray Trivalent chromium chemical conversion coating. Embodiment 56061 aluminum alloy trivalent chromium chromization

[0047] 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 12KGRidoline212, and then diluted to 500L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0048] 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...

Embodiment 77075

[0062] Embodiment 77075 aluminum alloy trivalent chromium chromization

[0063] 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 10KGRidoline212, and then diluted to 450L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0064] 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 18°C.

[0065] C. Build a 450L chromium bath: Please clean the container thoroughly before building ...

Embodiment 8

[0070] Example 8 Trivalent Chromium Chromization of Aluminum Alloy Die Castings

[0071] 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.

[0072] 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.

[0073] C. Build a 300L chromium bath: Please clean th...

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Abstract

The invention discloses a method for preparing a gray aluminum alloy trivalent chromium conversion film and its film-forming solution. In the film-forming solution, an inorganic corrosion inhibitor divalent cobalt salt and an organic corrosion inhibitor ethanolamine are added. The film-forming solution is used to Liquid treatment of aluminum or aluminum alloy workpieces can form a gray trivalent chromium conversion film on the surface of the aluminum alloy. Compared with the trivalent chromium conversion film with a single film layer, the present invention can meet customers' requirements for gray tone, improve the anticorrosion performance of aluminum alloy, and achieve the anticorrosion effect of hexavalent chromium chemical conversion film.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to a method for preparing a black aluminum alloy trivalent chromium composite 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. Beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08
Inventor 余会成雷福厚黄小小邓光辉谭学才韩燕燕
Owner GUANGXI UNIV FOR NATITIES
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