Middle temperature sealant and closing process for aluminum anodized film

An oxide film and sealer technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of ecological damage, slow degradation, long-term use accumulation, etc., to extend service life, easy to obtain, maintain stable effect

Active Publication Date: 2008-12-17
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Both of the above two patents use surfactants with macromolecules and benzene rings. This type of organic compound de

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] 1. After the aluminum and aluminum alloy samples are subjected to the anodic oxidation film formation treatment in the above steps ①-⑧, the oxide film is immediately subjected to the following sealing treatment.

[0052] 1. Oxide film sealing treatment:

[0053] (1) The composition of the blocking agent: magnesium acetate tetrahydrate 6.7g / L, triethanolamine 10mL / L, ammonium acetate 0.5g / L, and the pH value is adjusted to 5.6 with acetic acid.

[0054] (2) Sealing process: 80℃, immersion for 30min.

[0055] (3), secondary running tap water washing.

[0056] (4) Dry in the air at room temperature.

[0057] (5), inspection

[0058] The surface of the sample is clean, no "powder frost", phosphoric acid-chromic acid corrosion weight loss 25.7mg / dm 2 , Closed qualified.

Example Embodiment

[0059] Example 2

[0060] 1. After the aluminum and aluminum alloy samples are subjected to the anodic oxidation film formation treatment in the above steps ①-⑧, the oxide film is immediately subjected to the following sealing treatment.

[0061] 2. Oxide film sealing treatment:

[0062] (1) The composition of the blocking agent: 6.7 g / L magnesium acetate tetrahydrate, hydrazine hydrate (85%), 1 g / L ammonium acetate, and adjust the pH value to 5.85 with acetic acid.

[0063] (2) Sealing process: 80℃, immersion for 30min.

[0064] (3), secondary running tap water washing.

[0065] (4) Dry in the air at room temperature.

[0066] (5), inspection

[0067] The surface of the sample is clean and free of “powder frost”, and the weight loss of phosphoric acid-chromic acid corrosion is 24.1mg / dm 2 , Closed qualified.

Example Embodiment

[0068] Example 3

[0069] 1. After the aluminum and aluminum alloy samples are subjected to the anodic oxidation film formation treatment in the above steps ①-⑧, the oxide film is immediately subjected to the following sealing treatment.

[0070] 2. Oxide film sealing treatment:

[0071] (1) The composition of the blocking agent: lithium hydroxide 10g / L, triethanolamine 10mL / L, sodium acetate 0.5g / L, and the pH value is adjusted to 6.6 with acetic acid.

[0072] (2) Sealing process: 85℃, immersion for 30min.

[0073] (3), secondary running tap water washing.

[0074] (4) Dry in the air at room temperature.

[0075] (5), inspection

[0076] The surface of the sample is clean, no "powder frost", phosphoric acid-chromic acid corrosion weight loss 22.4mg / dm 2 , Closed qualified.

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Abstract

The invention discloses a mesophilic sealing agent and a sealing technique of aluminum anodic oxide films and belongs to the technical field of the post sealing processing of the anodic oxide films of aluminum and aluminum alloys. The sealing agent of the invention is an aqueous solution that consists of alkali metals or salts of alkali earth metals, a complexing agent and a pH buffering agent; wherein, the concentration of the alkali metals or the salts of alkali earth metals is 5 to 15 g/L, the concentration of the complexing agent is 10 to 20 g/L,, the concentration of the pH buffering agent is 0 to 10 g/L, and the residual quantity is water; the pH value of the aqueous solution of the sealing agent is maintained between 5 and 6, the aluminum anodic oxide film is sealing processed by the sealing agent, the temperature of the aqueous solution of the sealing agent is 75 to 90 DEG C, and the soaking and sealing time lasts for 20 to 30 minutes. The sealing agent adopts the alkali earth metals or the salts of alkali metals with wide resource and low cost so as to replace heavy metal nickel salts or cobalt salts in the prior art and adopts the organic complexing agent that has biodegradability, low price and simple molecules so as to replace surface activating agents that contain giant molecules and benzene rings in the prior art, and consequently the aluminum anodic oxide film that is sealing processed by the sealing agent obtains excellent anti-pruina property, and the anti-corrosion and anti-pollution properties of the anodic oxide film of aluminum and aluminum alloys are generally improved.

Description

technical field [0001] The invention relates to a medium-temperature sealing agent and a sealing process for aluminum anodic oxidation films, belonging to the technical field of post-sealing treatment of aluminum and aluminum alloy anodic oxidation films, and has nothing to do with the sealing technology of aluminum hard anodic oxidation films or non-electrolytic chemical conversion films. technical background [0002] Aluminum and aluminum alloys are one of the most commonly used metals in today's industry. Aluminum and aluminum alloys are not only light in weight and strong in texture, but also have good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance. An important basic raw material for economic development. [0003] Aluminum and aluminum alloys are stable in dry atmospheres, but are easily corroded in humid atmospheres, especially salty air. Anodic oxidation is widely used in industry to form an oxide film on th...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor 李鑫庆余静琴
Owner WUHAN RES INST OF MATERIALS PROTECTION
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