Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof

A technology of aluminum alloy and film-forming liquid, applied in the direction of metal material coating process, etc., can solve the problems of different substrate properties, single conversion coating composition, trivalent chromium conversion coating cannot be used for aluminum alloy treatment, etc., and achieves low cost. , Improve the anti-corrosion performance and facilitate the effect of production control

Inactive Publication Date: 2011-09-07
GUANGXI UNIV FOR NATITIES
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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 "Rapid film-forming solution on aluminum alloy surface at room temperature and its application method" (application number 200710017506.3 application date March 15, 2007) of Xi'an University of Architecture and Technology, and the invention The early Chinese patent "Preparation Method of Aluminum or Aluminum Alloy Trivalent Chromium Chemical Conversion Coating" (Application No. 200710034656.5, date of application: March 30, 2007) has a single component of the conversion coating, and its anti-corrosion performance needs to be further improved

Method used

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  • Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof
  • Method for preparing aluminium alloy/trivalent chromium composite conversion film and film-forming liquid thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 77075

[0067] Embodiment 77075 aluminum alloy trivalent chromium chromization

[0068] A. Build a 500L degreasing bath: 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, then diluted to 500L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0069] B. Building an activation bath: Clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 15% sulfuric acid solution, then clean it with water, add the required 12Kg of sodium hydroxide, and then Dissolve with deionized water and then dilute to 500L with deionized water, mix well, and keep the temperature at 17°C.

[0070] C. Build a 500L chromium bath: Clean the container thoroughly before building the bath. For new container...

Embodiment 8

[0075] Example 8 Trivalent Chromium Chromization of Aluminum Alloy Die Castings

[0076] A. Build a 300L degreasing bath: Clean the container thoroughly before building the bath. For new containers or new production lines, first wash with 50L of 20% sulfuric acid solution, then wash with water twice, each time with 60L of water, and then add Henkel's degreasing powder Ridoline 2128Kg is released to 300L, then diluted to 300L with deionized water, the pH is controlled within the range of 7-8, and mixed evenly.

[0077] B. Building an activation bath: Clean the container thoroughly before building the bath. For a new container or a new production line, first clean it with 15% sulfuric acid solution, then clean it with water, add the required 8Kg of sodium hydroxide, and then Dissolve with deionized water and then dilute to 300L with deionized water, mix well, and keep the temperature at 26°C.

[0078] C. Build a 300L chromium bath: clean the container thoroughly before building...

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PUM

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Abstract

The invention discloses a method for preparing an aluminium alloy/trivalent chromium composite conversion film and a film-forming liquid thereof. An inorganic corrosion inhibitor divalent manganese salt and an organic corrosion inhibitor ethanolamine are added into the coating-forming liquid, and a trivalent chromium composite conversion film can be formed on the surface of an aluminium alloy when the film-forming liquid is used to process an aluminium or aluminium alloy workpiece. Compared with the trivalent chromium conversion film with a single film layer, the aluminium alloy/trivalent chromium composite conversion film prepared by the method can improve the corrosion resistance of the aluminium alloy, and achieve the same corrosion resistance effect with that of a hexavalent chromium chemical conversion film.

Description

technical field [0001] The invention relates to aluminum alloy surface treatment, in particular to a method for preparing an 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. Because t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/18
Inventor 余会成谭学才雷福厚邓光辉韦冬萍韩燕燕
Owner GUANGXI UNIV FOR NATITIES
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