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An anodized sealing method for improving corrosion resistance of aluminum alloy

An aluminum alloy, anodizing technology, applied in anodizing, electrolytic coating, surface reaction electrolytic coating, etc., can solve problems such as toxicity, human health and environmental hazards, and achieve the effect of reducing adsorption and improving corrosion resistance

Active Publication Date: 2017-11-07
LUOYANG WEIXIN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, both chromate and nickel-cobalt salt have serious toxicity, which is very harmful to human health and the environment.

Method used

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  • An anodized sealing method for improving corrosion resistance of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Aluminum surface pretreatment

[0047] a. Alkaline cleaning: remove the oil and adsorbed various impurities on the surface of the parts to obtain a clean surface. Alkali washing uses heated NaOH solution, the specific parameters are 80g / L NaOH solution, the temperature is 90°C, and the time is 3 seconds after a large number of white bubbles appear on the entire surface.

[0048] b. Water washing: immediately after alkali washing, remove the aluminum alloy from the alkali washing solution, wash it with clean water, and remove the excess treatment solution in time;

[0049] c. Pickling: HNO is used for pickling3 Solution, the specific parameter is 20% (mass ratio) HNO 3 solution at room temperature for 18 minutes to fully expose and activate the substrate and make the surface of the product bright.

[0050] d. Washing: Wash with water immediately after pickling to remove excess treatment liquid in time to avoid excessive treatment and damage the surface of the produ...

Embodiment 2

[0071] 1) Aluminum surface pretreatment

[0072] a. Alkaline cleaning: remove the oil and adsorbed various impurities on the surface of the parts to obtain a clean surface. Alkali washing uses heated NaOH solution, the specific parameters are 100g / L NaOH solution, the temperature is 70°C, and the time is 3 seconds after a large number of white bubbles appear on the entire surface.

[0073] b. Water washing: immediately after alkali washing, remove the aluminum alloy from the alkali washing solution, wash it with clean water, and remove the excess treatment solution in time;

[0074] c. Pickling: HNO is used for pickling 3 solution, the specific parameter is the mass content of 20% HNO 3 Solution, at room temperature, for 20 minutes, fully expose and activate the substrate, and make the surface of the product bright.

[0075] d. Washing: Wash with water immediately after pickling to remove excess treatment liquid in time to avoid excessive treatment and damage the surface o...

Embodiment 3

[0096] 1) Aluminum surface pretreatment

[0097] a. Alkaline cleaning: remove the oil and adsorbed various impurities on the surface of the parts to obtain a clean surface. Alkaline cleaning uses heated NaOH solution, the specific parameters are 90g / L NaOH solution, the temperature is 70°C, and the time is 3 seconds after a large number of white bubbles appear on the entire surface.

[0098] b. Water washing: immediately after alkali washing, remove the aluminum alloy from the alkali washing solution, wash it with clean water, and remove the excess treatment solution in time;

[0099] c. Pickling: HNO is used for pickling 3 solution, the specific parameter is the mass content of 20% HNO 3 Solution, at room temperature, for 2 minutes, fully expose and activate the substrate, and make the surface of the product bright.

[0100] d. Washing: Wash with water immediately after pickling to remove excess treatment liquid in time to avoid excessive treatment and damage the surface ...

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Abstract

This patent introduces an anodized sealing method to improve the corrosion resistance of aluminum alloy, including: pretreatment of aluminum surface, anodic oxidation of aluminum products, making supersaturated sodium molybdate solution or sodium tungstate aqueous solution, and adjusting the pH value to 5.5 ‑6.5; 70‑100 ° C for 10‑30 min once, make a supersaturated La2 (CO3) 3 or Pr2 (CO3) 3 aqueous solution, adjust the pH value to 5.5‑6.5; 70‑100 ° C; Wash, dry, and the craft is complete. This method adopts the double sealing method to replace the single sealing of the traditional process, which significantly improves the corrosion resistance of aluminum alloy products; uses sodium molybdate and sodium tungstate solution instead of dichromate for primary sealing; uses rare earth carbonate instead of nickel The cobalt salt is double sealed, which greatly improves the surface compactness of the aluminum alloy and improves the corrosion resistance of the product; the manufacturing process is simple, the equipment requirements are low, and it is harmless to the environment.

Description

technical field [0001] The invention relates to an anodization method, in particular to an anodization sealing method for improving the corrosion resistance of aluminum alloys. Background technique [0002] Aluminum and its alloys have excellent physical properties such as light weight, electrical conductivity and thermal conductivity. They have been widely used in modern aviation, aerospace, electric power, electronics, petroleum and national defense industries and are constantly expanding new application fields. Aluminum is a very special metal that is easily oxidized to form a protective film in the atmosphere, but as a typical amphoteric metal that can react with both acid and alkali, it will be corroded in both pickling and alkali cleaning environments. Its application is therefore greatly limited. Therefore, aluminum alloy parts often require proper surface treatment before use. At present, the surface treatment technologies of aluminum alloys are mainly anodic oxida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D11/18
Inventor 梁允
Owner LUOYANG WEIXIN ELECTRONICS TECH
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