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Blocking method for improving alkali resistance of hard anodic oxidation film

A hard anodic oxidation, alkali-resistant technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc. Pores and other problems to achieve the effect of increasing service life, delaying corrosion, and increasing the number of cycles

Active Publication Date: 2015-11-18
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 sealing liquid used in this embodiment is a mixed aqueous solution composed of stearic acid and sodium hydroxide, and the mass concentration of stearic acid is 5 g / L; the mass concentration of sodium hydroxide is 2g / L.

[0020] The aluminum alloy workpiece described in this embodiment may be cooking utensils such as aluminum alloy pots.

[0021] The following is the sealing method of hard anodized film for improving alkali resistance of aluminum alloy workpiece, the specific method is as follows:

[0022] Select the corresponding aluminum alloy, and then use the method of deep drawing, spinning, extrusion or cutting to machine and shape the corresponding aluminum alloy workpiece; then perform trimming and deburring treatment, and remove the grease on the surface of the aluminum alloy workpiece. Pre-treatment; then, the pre-treated aluminum alloy workpiece is subjected to hard anodizing treatment to produce a hard anodized film on the surface of the aluminum alloy...

Embodiment 2

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

[0031] The aluminum alloy workpiece described in this embodiment may be cooking utensils such as aluminum alloy pots.

[0032] The following is the sealing method of hard anodized film for improving alkali resistance of aluminum alloy workpiece, the specific method is as follows:

[0033] Select the corresponding aluminum alloy, and then use the method of deep drawing, spinning, extrusion or cutting to machine and shape the corresponding aluminum alloy workpiece; then perform trimming and deburring treatment, and remove the grease on the surface of the aluminum alloy workpiece. Pre-treatment; then, the pre-treated aluminum alloy workpiece is subjected to hard anodizing treatment to produce a hard anodized film on the surface of the aluminum ...

Embodiment 3

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

[0042] The hard anodic oxidation treatment in this embodiment is the same as the method in Embodiment 1, and will not be repeated here.

[0043] Put the aluminum alloy workpiece after the hard anodizing treatment into the sealing solution with a mass concentration of 2.0g / L nickel fluoride aqueous solution, and control the sealing temperature to room temperature for the first sealing treatment for 25 minutes, then, The aluminum alloy workpiece was taken out and put into the above-mentioned stearate sealing solution and the temperature was controlled at 110°C for the second sealing treatment for 20 minutes. After the sealing treatment, the corresponding aluminum alloy workpiece was obtained. The workpiece is preferably an aluminum alloy pot. ...

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Abstract

The invention relates to a blocking method for improving the alkali resistance of a hard anodic oxidation film, belongs to the technical field of cooker materials and aims to solve the problem that a conventional hard anodic oxidation film is poor in alkali resistance. The blocking method comprises the following steps: A, placing an aluminium alloy workpiece subjected to hard anodic oxidation treatment in a nickel fluoride blocking solution for first-time blocking treatment; and B, placing the aluminium alloy workpiece subjected to first-time blocking treatment in a stearate blocking solution and controlling the temperature to be 75-110 DEG C for second-time blocking treatment to obtain the blocked aluminium alloy workpiece. The blocking method can better block micropores in the hard anodic oxidation film to improve the decay resistance of the aluminium alloy workpiece, so that the alkali resistance is improved, accordingly, the cycle index of cleaning by a dish washing machine is increased and the service life is prolonged.

Description

Technical field [0001] The invention relates to a hard anodic oxide film sealing method for improving alkali resistance, and belongs to the technical field of cookware materials. Background technique [0002] Hard anodizing technology is the most excellent technology among all aluminum alloy surface treatment technologies. 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 especially widely used in the 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 entire cleaning process of the dishwasher washing standard process includes: preparation before washing, using alkaline detergent, neutral bleaching agent, then washing, and finally drying. Due to the alkaline cleaning agent used in the dishwasher (pH value is abo...

Claims

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Application Information

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