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Sealing agent for aluminum and aluminum alloy anode oxide films and preparation method for sealing agent

A technology of anodic oxidation film and sealing agent, which is applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of unfavorable performance and environment of aluminum and aluminum alloy anodic oxidation film, poor stability of sealing liquid, sealing liquid High temperature and other problems, to achieve the effect of improving convenience, not easy to decompose, and improving corrosion resistance

Inactive Publication Date: 2015-05-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Some of the above-mentioned patents and literatures have high temperature of the sealing solution and high energy consumption; some of the sealing solution contain nickel and fluorine ions that are harmful to the environment and the human body; The performance and environment of the sealed aluminum and aluminum alloy anodized film have adverse effects

Method used

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  • Sealing agent for aluminum and aluminum alloy anode oxide films and preparation method for sealing agent
  • Sealing agent for aluminum and aluminum alloy anode oxide films and preparation method for sealing agent
  • Sealing agent for aluminum and aluminum alloy anode oxide films and preparation method for sealing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 17g of Ce(NO 3 ) 3 Add 800mL of deionized water, stir well, then add 0.6g of KMnO 4 , stir evenly, then add 0.27g of K under stirring 4 P 2 o 7 , add deionized water to make up to 1 L to obtain a blocking agent.

[0034] The anodized 6063 aluminum alloy is placed in a sealing agent for sealing treatment, the temperature is 27° C., and the time is 40 minutes. The surface of the aluminum alloy anodized film after sealing is uniform golden yellow, and its scanning electron microscopic image can be seen in figure 2 ; Its polarization curve in 1mol / L HCl solution is shown in image 3 , the polarization curve in 1mol / L NaOH solution is shown in Figure 5 ; Its AC impedance curves in the corresponding acid and alkali are shown in Figure 4 and Figure 6 , the sealing treatment of the present invention significantly improves the corrosion resistance of the aluminum alloy anodized film.

Embodiment 2

[0036] 18g of Y (NO 3 ) 3 Pour into 800mL deionized water, stir well, then add 0.5 KMnO 4and 0.2g of 30% H 2 o 2 , stir evenly; add 0.3g of Na under stirring 4 P 2 o 7 , add deionized water to make up to 1 L to obtain a blocking agent.

[0037] The anodized 6063 aluminum alloy is placed in a sealing agent for sealing treatment, the temperature is 30° C., and the time is 35 minutes. The surface of the aluminum alloy anodic oxide film after sealing is uniform golden yellow, and its full immersion test result comparison with the unsealed anodic oxide film in 1mol / L HCl solution is shown in Table 1, and the sealing treatment of the present invention has significantly improved the aluminum alloy anode. Corrosion resistance of oxide film.

Embodiment 3

[0039] 15g of Nd(NO 3 ) 3 Pour into 800mL deionized water, stir well, then add 0.8g of NaClO 4 ·H 2 O, stir evenly; add 0.25g of Na under stirring 4 P 2 o 7 , add deionized water to make up to 1 L to obtain a blocking agent.

[0040] The anodized 6063 aluminum alloy is placed in a sealing agent for sealing treatment, the temperature is 35° C., and the time is 35 minutes. The surface of the aluminum alloy anodic oxide film after sealing is uniform golden yellow, and it compares with the full immersion test result of the unsealed anodic oxide film in Table 2 in 1mol / L NaOH solution, and the sealing treatment of the present invention has significantly improved the aluminum alloy anode. Corrosion resistance of oxide film.

[0041] Table 1

[0042]

[0043] Table 2

[0044]

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PUM

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Abstract

The invention discloses a sealing agent for aluminum and aluminum alloy anode oxide films and a preparation method for the sealing agent. The sealing agent comprises the following raw materials by lL: 15-20g of lanthanide nitrate, 0.6-0.8g of oxidizing agent, 0.25-0.3g of stabilizing agent and deionized water, wherein the additive amount of the deionized water is the amount of adding the deionized water until the volume is constant at 1L after the rest raw materials are mixed. According to the sealing agent disclosed by the invention, by utilizing the combined action of rare-earth metal and the oxidizing agent, porous layers of the anode oxide films can be effectively sealed, and the corrosion resistance of the anode oxide films is obviously improved. Meanwhile, the sealing agent disclosed by the invention does not contain chromium, nickel or fluorine, therefore, the human body cannot be harmed, and the environment cannot be polluted. The sealing agent is a green environmental-protection sealing agent. Moreover, the aluminum and aluminum alloy anode oxide films can be sealed at normal temperature, therefore, not only is the energy consumption reduced but also the operation convenient is improved. After being treated by the sealing agent disclosed by the invention, the aluminum and aluminum alloy anode oxide films are compact in surface structure, is in uniform golden yellow and is higher in bonding strength.

Description

1. Technical field [0001] The invention relates to an aluminum and aluminum alloy anodized film sealant and a preparation method thereof, belonging to the technical field of metal surface corrosion protection. The sealing agent of the present invention does not contain elements such as chromium, nickel and fluorine that pollute and poison the environment and the human body, and the sealing of aluminum and aluminum alloy anodic oxide films is carried out at 20-35°C, which is environmentally friendly, energy-saving, and high-efficiency. Corrosion resistance and other characteristics, can form a layer of dense, golden yellow high corrosion resistance sealing film on the surface of aluminum and aluminum alloy anodic oxidation film. 2. Background technology [0002] The chemical properties of aluminum and aluminum alloys are active, and a layer of oxide film will be formed on the surface in the air. This film has poor protection ability in industrial atmosphere, sea water and var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/24
Inventor 宣天鹏周赟张万利汪亮
Owner HEFEI UNIV OF TECH
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