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Integrated hole sealing method for anodic oxide films of aluminum alloys

A technology of anodic oxidation film and treatment method, which is applied in the field of hole sealing, can solve the problems of losing the sealing effect and easy corrosion of the oxide film, and achieves the effect of excellent timeliness

Inactive Publication Date: 2015-08-12
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rare earth sealing method, like boiling water sealing, dichromic acid sealing, and nickel fluoride, is susceptible to corrosion when the oxide film is slightly damaged. At the same time, some sealing materials may be rinsed in a humid environment and lose their sealing. Effect

Method used

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  • Integrated hole sealing method for anodic oxide films of aluminum alloys
  • Integrated hole sealing method for anodic oxide films of aluminum alloys
  • Integrated hole sealing method for anodic oxide films of aluminum alloys

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specific Embodiment

[0042] Test 1: Cerium salt-phosphate composite sealing. First use cerium salt to seal the holes. The cerium salt solution used is composed of: cerium nitrate 6g / L, hydrogen peroxide 3g / L, and the pH of the solution is 4.4. Place the prepared anodized film in the above-mentioned cerium salt sealing solution , constant temperature to 30°C, sealing treatment for 90min, followed by sealing with phosphate, using Al(H 2 PO 4 ) 3 The solution is sealed, the Al(H 2 PO 4 ) 3 The solution synthesis method is: weigh a certain amount of H 3 PO 4 Solution and heated to 85 ° C, according to the ratio of the amount of substances Al / P = 1:3, to H 3 PO 4 Slowly add solid Al(OH) into the solution 3 , and stirred until solid Al(OH) 3 completely dissolved to form Al(H 2 PO 4 ) 3 solution, and then use deionized water to prepare Al(H 2 PO 4 ) 3 The solution is diluted, and the diluted Al(H 2 PO 4 ) 3 The mass fraction of the solution is 10%. Next, the prepared Al(H 2 PO 4 ) ...

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Abstract

The invention discloses an integrated hole sealing method for anodic oxide films of aluminum alloys. The integrated hole sealing method is excellent in hole sealing effect and high in timeliness and includes the steps: firstly, preparing phosphate solution and cerium salt solution; secondly, putting the anodic oxide films of the aluminum alloy into the cerium salt solution to carry out cerium salt hole sealing; thirdly, uniformly brushing the phosphate solution onto the anodic oxide films subjected to cerium salt hole sealing, curing for a while in the air, and carrying out thermal treatment at the temperature ranging from 150 DEG C to 350 DEG C; finally, forming a compact phosphate coating on the surface of the anodic oxide films after the steps are repeated for 2-8 times. Corrosion resistance and abrasion resistance of the anodic oxide films subjected to integrated hole sealing are much higher than those of anodic oxide films subjected to single hole sealing, and effects of integrated hole sealing are much higher than additive effects of single cerium salt hole sealing and phosphate hole sealing. In addition, cerium salt and phosphate integrated hole sealing method is high in timeliness and suitable for popularization and application in the technical field of hole sealing.

Description

technical field [0001] The invention relates to the technical field of hole sealing, in particular to a composite hole sealing treatment method of aluminum alloy anodized film. Background technique [0002] Pure aluminum is soft and ductile, but its strength is low, limiting its application where higher strength is required. For this reason, some alloying elements are usually added in the industry to obtain aluminum alloys with different properties. Aluminum alloy has the advantages of high specific strength, excellent thermal conductivity, good corrosion resistance and good plasticity. In addition, the high temperature performance, formability and surface treatment performance of aluminum alloy are also relatively good. It is a non-ferrous metal with excellent comprehensive performance. Metal. Therefore, aluminum and its alloys have been widely used in various fields such as aerospace, automobiles, construction, bridges, ships, chemicals, packaging, machinery and equipmen...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor 张鲲陈辉骆晓伟董立新刘艳宁淑红
Owner SOUTHWEST JIAOTONG UNIV
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