Anodization closing method for improving corrosion resistance of aluminum alloy

An aluminum alloy, anodizing technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of toxicity, human health and environmental hazards, achieve improved compactness, low input cost, and low equipment requirements high effect

Active Publication Date: 2013-06-26
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 toxi

Method used

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  • Anodization closing method for improving corrosion resistance of aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Pretreatment of aluminum surface

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

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

[0049] c. Pickling: HNO is used for pickling3 Solution, the specific parameters are 20% (mass ratio) HNO 3 The solution, room temperature, for 18 minutes, fully exposed and activated the substrate, and made the surface of the product bright.

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

Embodiment 2

[0071] 1) Pretreatment of aluminum surface

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

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

[0074] c. Pickling: HNO is used for pickling 3 Solution, the specific parameters are the mass content of 20% HNO 3 Solution, room temperature, time 20 minutes, make the substrate fully exposed and activated, and make the surface of the product bright.

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

Embodiment 3

[0096] 1) Pretreatment of aluminum surface

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

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

[0099] c. Pickling: HNO is used for pickling 3 Solution, the specific parameters are the mass content of 20% HNO 3 Solution, room temperature, time 2 minutes, make the substrate fully exposed and activated, and make the surface of the product bright.

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

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Abstract

The invention relates to an anodization closing method for improving the corrosion resistance of an aluminum alloy. The method comprises a step of aluminum surface pretreatment, a step of aluminum product anodization, a step of preparation of a supersaturated sodium molybdate solution or an aqueous sodium tungstate solution, a step of adjusting the pH value to 5.5-6.5, a step of primary closing at 70-100DEG C for 10-30min, a step of preparing a supersaturated aqueous La2(CO3)3 or Pr2(CO3)3 solution, a step of adjusting the pH value to 5.5-6.5, a step of secondary closing at 70-100DEG C for 10-30min, a step of cleaning, and a step of drying to complete the process. The method adopts a double closing technique to substitute single-time closing of a traditional technology, so the corrosion resistance of the aluminum alloy product is substantially improved; the sodium molybdate or sodium tungstate solution is adopted to carry out the primary closing; and rare earth carbonate is adopted to substitute nickel and cobalt salts to carry out the secondary closing, so the surface compactness of the aluminum alloy is greatly improved, and the corrosion resistance of the product is improved; and the method has the advantages of simple making technology, low equipment requirement and harmlessness 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 into new application fields. Aluminum is a very special metal, which is easily oxidized in the atmosphere to form a protective film, but as a typical amphoteric metal that can react with both acid and alkali, it will be corroded in the environment of pickling and alkali cleaning. Its application is therefore greatly limited. Therefore, aluminum alloy parts are often subjected to appropriate surface treatment before use. At present, the surface treatment technologies of aluminum alloys a...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/18
Inventor 梁允
Owner LUOYANG WEIXIN ELECTRONICS TECH
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