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A kind of sealing method of hard anodic oxidation film that improves alkali resistance

A hard anodic oxidation and alkali resistance technology, applied in the direction of electrolytic coatings, surface reaction electrolytic coatings, coatings, etc. To achieve the effect of increasing service life, delaying corrosion and improving alkali resistance

Active Publication Date: 2017-06-13
ZHEJIANG SUPOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has a good sealing effect, it only discloses the sealing effect under hydrochloric acid or neutral conditions, and because the water solubility of stearic acid is too low and can not completely seal the micropores of the anodized film, the inventors found that if directly The oxide film treated with hard acid sealing solution cannot achieve a good sealing effect under alkaline conditions, and its alkali resistance is still very poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The stearate blocking solution used in the present embodiment is a mixed aqueous solution composed of stearic acid and sodium hydroxide, and the mass concentration of the stearic acid is 5g / L; the mass concentration of the sodium hydroxide is 2g / L.

[0020] The aluminum alloy workpiece described in this embodiment may be cookware such as an aluminum alloy pan.

[0021] The following is the hard anodized film sealing method for improving the alkali resistance of aluminum alloy workpieces. The specific methods are as follows:

[0022] Select the corresponding aluminum alloy, and then use the methods of deep drawing, spinning, extrusion or cutting to machine and form the corresponding aluminum alloy workpiece; then perform trimming and deburring treatment, and remove the grease on the surface of the aluminum alloy workpiece, etc. Pre-treatment; then, the pre-treated aluminum alloy workpiece is subjected to hard anodic oxidation treatment, so that a hard anodic oxide film ...

Embodiment 2

[0030] The stearate blocking solution used in the present embodiment is a mixed aqueous solution composed of stearic acid and sodium hydroxide, and the mass concentration of the stearic acid is 10g / L; the mass concentration of the sodium hydroxide is 5.0g / L.

[0031] The aluminum alloy workpiece described in this embodiment may be cookware such as an aluminum alloy pan.

[0032] The following is the hard anodized film sealing method for improving the alkali resistance of aluminum alloy workpieces. The specific methods are as follows:

[0033] Select the corresponding aluminum alloy, and then use the methods of deep drawing, spinning, extrusion or cutting to machine and form the corresponding aluminum alloy workpiece; then perform trimming and deburring treatment, and remove the grease on the surface of the aluminum alloy workpiece, etc. Pre-treatment; then, the pre-treated aluminum alloy workpiece is subjected to hard anodic oxidation treatment, so that a hard anodic oxide fi...

Embodiment 3

[0041] The stearate blocking solution used in the present embodiment is a mixed aqueous solution composed of stearic acid and sodium hydroxide, and the mass concentration of the stearic acid is 6.0g / L; the mass concentration of the potassium hydroxide It is 3.0g / L.

[0042] The hard anodizing treatment in this embodiment is consistent with the method in Embodiment 1, and will not be repeated here.

[0043] Put the aluminum alloy workpiece after the hard anodic oxidation treatment into the sealing solution of nickel fluoride aqueous solution with a mass concentration of 2.0g / L, and carry out the first sealing treatment under the condition that the sealing temperature is normal temperature for 25 minutes, and then, Take out the aluminum alloy workpiece and put it into the above-mentioned stearate sealing solution, and carry out the second sealing treatment under the condition of 110° C. for 20 minutes. After the sealing treatment is completed, the corresponding aluminum alloy wo...

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Abstract

The invention relates to a method for sealing a hard anodized film for improving alkali resistance, and belongs to the technical field of cooker materials. In order to solve the problem of poor alkali resistance of the existing hard anodized film, a method for sealing the hard anodized film that improves the alkali resistance is provided. The method includes the following steps: A. Aluminum alloy through hard anodized Put the workpiece into the nickel fluoride sealing solution for the first sealing treatment; B. Put the aluminum alloy workpiece after the first sealing treatment into the stearate sealing solution and control the temperature at 75°C to 110°C A second sealing treatment is performed to obtain a sealed aluminum alloy workpiece. The method of the invention can better block the micropores in the hard anodized film, improve the corrosion resistance of the aluminum alloy workpiece, increase the alkali resistance, thereby increasing the cycle times of the dishwasher and increasing the service life.

Description

technical field [0001] The invention relates to a method for sealing a hard anodized film for improving alkali resistance, and belongs to the technical field of cooker materials. Background technique [0002] Hard anodic oxidation technology is the most excellent technology among all surface treatment technologies of aluminum alloy. It has significant advantages such as high film thickness, high hardness, and high wear resistance. It has been widely used in the surface treatment of aluminum alloys. It is used in cookware It is especially widely used in industry. However, dishwashers are used more and more in modern kitchens, and more and more cookware products must be washed with dishwashers. According to the European standard EN12875-1: 2005, the dishwasher washing standard process includes: preparation before washing, using alkaline detergent, neutral bleaching agent, then washing, and finally drying. Because the alkaline cleaning agent (pH value is about 10-12) used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/18
Inventor 徐存荣
Owner ZHEJIANG SUPOR CO LTD