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Anodic rare-earth oxide membrane closing method of aluminium alloy

An anodic oxidation film, anodic oxidation technology, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of high energy consumption, short processing time, and increased cost, and achieve simple maintenance, low solubility, and consumption The effect of less heat energy

Inactive Publication Date: 2008-02-27
祥兴泰五金制品(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, although the steam sealing method has faster reaction and shorter processing time than the boiling water sealing method, the operating temperature of the steam sealing method is 110-150°C, which requires supporting heating equipment and consumes a lot of energy, which greatly increases the cost

Method used

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  • Anodic rare-earth oxide membrane closing method of aluminium alloy
  • Anodic rare-earth oxide membrane closing method of aluminium alloy
  • Anodic rare-earth oxide membrane closing method of aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 The rare earth sealing method of anodic oxidation film of wrought aluminum alloy.

[0030] (1) Material: Forged aluminum alloy adopts national standard LD7 aluminum alloy.

[0031] (2) Anodizing treatment: polish the test piece, wash it with alkali to remove oil, and put it in a sulfuric acid solution (mass concentration of 250g / l) at 2A / dm 2 Oxidation by electric current for 1 hour, cleaning with deionized water, and observing with a scanning electron microscope, it can be seen that an anodic oxide film with a film thickness of about 20 microns is obtained.

[0032] (3) sealing treatment: according to the operating steps of the sealing method of the present invention, 1 gram of Nd 2 (CO 3 ) 3 and 1 g La 2 (CO 3 ) 3 Add 1 liter of water to make Nd 2 (CO 3 ) 3 and La 2 (CO 3 ) 3 Blocking solution for supersaturated aqueous solutions. The aluminum alloy sealed anodic oxidation film was obtained under the conditions of temperature 95°C and sealing ti...

Embodiment 2

[0035] Example 2 Rare-earth sealing method of anti-rust aluminum alloy anodized film.

[0036] The aluminum alloy adopts the anti-rust aluminum alloy of the national standard LF21 aluminum alloy. Anodizing treatment: the sulfuric acid solution used has a mass concentration of 200g / l to obtain an anodized film of 18 microns. All the other operating methods and process conditions are the same as in Example 1. The obtained polarization curve is shown as curve a in Fig. 2 .

[0037] The present embodiment compares with comparative example 3, comparative example 4, as can be seen from Fig. 2, the closed anodic oxide film that the present embodiment obtains is all smaller than the passive current of potassium dichromate and boiling water sealing, and this just illustrates the sealing of the present invention The oxide film has higher corrosion resistance.

Embodiment 3

[0038] Example 3 Rare earth sealing method of anodic oxidation film of cast aluminum alloy.

[0039] The aluminum alloy adopts the cast aluminum alloy of national standard ZL201. Anodizing treatment: the sulfuric acid solution used has a mass concentration of 150g / l to obtain an aluminum anodic oxidation film of 15 microns. All the other operating methods and process conditions are the same as in Example 1. The obtained polarization curve is shown in Fig. 3 a curve.

[0040] The present embodiment is compared with comparative example 5 and comparative example 6. As can be seen from Fig. 3, the closed anodic oxide film obtained in this embodiment is smaller than the passive current of potassium dichromate and boiling water sealing, which shows that the closed anodized film of the invention Membrane corrosion resistance is higher.

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Abstract

The invention is about the RE sealing method of A-alloy anode oxide film. The A-alloy is oxidized by the anode with the confining liquid of the supersaturated RE carbonate in the condition of pH5.5-6.5at 90-100 Deg C.. The RE carbonate is the one or the two compound of La2(CO3)3,Nd2(CO3)3,Ce2(CO3)3,Pr2(CO3)3.the confining liquid is cheap and ersion resisting.

Description

technical field [0001] The invention relates to a sealing treatment method for an aluminum alloy anodic oxidation film, in particular a sealing treatment method in which a rare earth salt solution is used as a sealing solution. Background technique [0002] As we all know, aluminum alloy is anodized in acid solution to form a microporous anodized film with controllable thickness on the surface of the material. The sealing treatment of aluminum alloy anodized film is an effective method to reduce adsorption and improve corrosion resistance and electrical insulation. Usually, the sealing treatment method is to chemically block the micropores of the anodized film. At present, most of the sealing fluids used in the aluminum alloy oxide film sealing process widely used in industry are toxic. According to the literature (L.Hao, B.R.Cheng, Sealing processes of anodic coatings-past, present, and future, Metal Finishing.2000, 12: 8-18), Ni used in the low-temperature sealing (cold ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/24
Inventor 左禹李启征赵景茂张晓丰
Owner 祥兴泰五金制品(深圳)有限公司
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