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Metal salt-free sealing agent for aluminum alloy anodic oxide film

An anodic oxidation film, metal-free technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of environmental pollution sealing film layer grade sealing agent cost, etc., to reduce the loss of dyes, protect Good light color retention and good environmental compatibility

Active Publication Date: 2013-01-30
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a metal-salt-free sealing agent for aluminum alloy anodic oxidation film, to develop an environmentally friendly water-soluble sealing agent that does not contain metal nickel, magnesium, calcium, lithium salts and fluoride ions, and can be widely used in natural color anodic oxidation film, electrolytic coloring anodic oxide film, hard oxide film and dyed anodic oxide film sealing treatment, so as to solve the environmental pollution, sealing film grade and sealing agent cost in the current closed system of aluminum alloy anodic oxidation film containing metal salt and many other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Sealant composition:

[0056] Lauryl ethanolamine 3.0g / L

[0057] Ammonium acetate 6.5g / L

[0058] Isomerized lauryl polyoxyethylene ether 1.0g / L

[0059] Acrylic polymer 1.2g / L

[0060] Deionized water balance

[0061] Process conditions: pH (adjusted with acetic acid or ammonia water) 5.5-6.5, temperature 80-86°C, sealing time 20 minutes.

[0062] There is no water stain on the surface of the sample, no "powder frost", and no pollutants when wiped with wet filter paper. Phosphorus-chromic acid method weight loss 18.9mg / dm 2 . Dyed anodized film does not fade.

Embodiment 2

[0064] Sealant composition:

[0065] Lauryl ethanolamine 1.5g / L

[0066] Ammonium citrate 8.4g / L

[0067] Isomerized lauryl polyoxyethylene ether 1.6g / L

[0068] Polyurethane-acrylic acid copolymer 0.7g / L

[0069] Deionized water balance

[0070] Process conditions: pH (adjusted with acetic acid or ammonia water) 5.5-6.0, temperature 85-90°C, sealing time 15 minutes.

[0071] There is no water stain on the surface of the sample, no "powder frost", and no pollutants when wiped with wet filter paper. Phosphorus-chromic acid method weight loss 24.6mg / dm 2 . Dyed anodized film does not fade.

example 3

[0073] Sealant composition:

[0074] Lauryl ethanolamine 8.4g / L

[0075] Ammonium acetate 2.3g / L

[0076] Isomerized Lauryl Polyoxygen 0.7g / L

[0077] Polyurethane-acrylic acid copolymer 1.8g / L

[0078] Deionized water balance

[0079] Process conditions: pH (adjusted with acetic acid or ammonia water) 6.0-6.5, temperature 80-85°C, sealing time 25 minutes.

[0080] There is no water stain on the surface of the sample, no "powder frost", and no pollutants when wiped with wet filter paper. Phosphorus-chromic acid method weight loss 22.5mg / dm 2 . Dyed anodized film is slightly discolored.

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PUM

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Abstract

The invention provides a metal salt-free sealing agent for an aluminum alloy anodic oxide film, belonging to the technical field of aluminum alloy anodic oxide film post treatment. The sealing agent of the invention is prepared by water solution composed of 1.0-10g / L of a hydration accelerator, 0.01-2g / L of a wetting agent, 0.01-3g / L of an ash inhibitor and 1-15g / L of a pH buffering agent, wherein the pH of workpiece fluid is 5.5-6.5, the operating temperature is 70-90 DEG C, and the sealing speed is 1.0-2.0min / um. The metal salt-free sealing agent creatively adopts organic compounds which are easily subject to biodegradation, does not contain any metal ions of nickel, cobalt, magnesium, calcium, lithium and the like as well as fluorinions, and obtains satisfactory sealing effect of the nano-pores of the aluminum alloy anodic oxide film by virtue of the scientific and coordinated component formula of the water solution; the aluminum alloy anodic oxide film obtained by seal treatment through the sealing agent has the advantages of good corrosion resistance, capability of meeting the requirements of GB 14952.1-94, good light-protection and color-protection properties of a film layer, no ash and pruina, no water stain after drying as well as light flowing color and small color difference change in case of sealing the organic dyeing film; and the metal salt-free sealing agent is widely applicable to sealing treatment of an original-color anodic oxide film, an electrolytic coloring anodic oxide film, a hard oxide film and a dyeing anodic oxide film.

Description

technical field [0001] The invention discloses a metal-salt-free sealing agent for aluminum alloy anodic oxidation film, which belongs to the technical field of post-treatment of aluminum alloy anodic oxidation film. technical background [0002] Aluminum and its alloy materials are the most used and widely used metal materials among non-ferrous metals. Because of their excellent physical, chemical, mechanical and processing properties, they can meet the needs of everything from kitchen utensils to cutting-edge technology, from architectural decoration Various industries such as transportation and aerospace have different and different requirements for the use of aluminum alloy materials. However, some application properties of aluminum such as hardness, wear resistance and corrosion resistance are not ideal, and surface treatment technology just makes up for these weaknesses. The anodic oxidation treatment of aluminum and its alloys is the best surface treatment technology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/18
Inventor 张德忠张金生毛祖国
Owner WUHAN RES INST OF MATERIALS PROTECTION
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