Anticorrosion treatment method for aluminum alloy

A technology of anti-corrosion treatment and aluminum alloy, applied in the field of metal surface treatment, to achieve the effect of improved salt spray resistance time, good wear resistance and strong bonding force

Active Publication Date: 2021-10-29
CHINA WEAPON SCI ACADEMY NINGBO BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, ZL250A aluminum alloy, due to the existence of silicon, copper and other phases (under normal conditions, it is difficult to oxidize or form stable oxides), it is difficult to prepare a micro-arc oxidation film with strong adhesion and good uniformity on its surface.

Method used

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  • Anticorrosion treatment method for aluminum alloy
  • Anticorrosion treatment method for aluminum alloy
  • Anticorrosion treatment method for aluminum alloy

Examples

Experimental program
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Embodiment 1

[0028] like figure 1 , 3 As shown, it is a preferred embodiment 1 of an anti-corrosion treatment method for an aluminum alloy of the present invention, and the anti-corrosion treatment method comprises the following steps:

[0029] 1. Preprocessing

[0030] The surface of the aluminum alloy sample was ground, and 100, 400, 800 and 1200 mesh water sandpaper was used to grind the surface of the sample step by step until there was no obvious scratch on the surface; then polished until the surface roughness was less than 0.6 μm.

[0031] Use concentrated sulfuric acid with a mass fraction of more than 98% to passivate the polished aluminum alloy sample for 20s, take out and rinse with a large amount of deionized water; then put the sample into a 2% mass fraction of hydroxide In a sodium solution, ultrasonically cleaned at 40°C for 10 min until the passivation layer was completely peeled off, wherein the ultrasonic power was 300W and the ultrasonic frequency was 40KHz. Finally r...

Embodiment 2

[0042] This embodiment is basically the same as the first embodiment, the difference is:

[0043] 1. The proportions of electrolyte components are different. In this embodiment, 10 parts of sodium silicate, 2 parts of sodium tungstate, 20 parts of sodium fluoride, 1 part of sodium lauryl sulfate, 2 parts of triethanolamine, 2 parts of glycerin.

[0044] 2. The micro-arc oxidation process parameters are different. In this embodiment, the reaction times of the first, second, and third stages are respectively: 15, 10, and 5 min. The positive voltage of the bipolar DC pulse power supply in each stage is 550V, and the negative The voltages are all 200V, the frequencies are all 500Hz, the duty ratios of the positive and negative voltages are both 20%, and the temperature of the electrolyte is about 40°C.

[0045] The apparent morphology of the finished sample prepared in this example is similar to that of Example 1.

Embodiment 3

[0047] This embodiment is basically the same as the first embodiment, the difference is:

[0048] 1. The proportions of electrolyte components are different. In this example, 50 parts of sodium silicate, 2 parts of sodium tungstate, 20 parts of sodium fluoride, 1 part of sodium lauryl sulfate, 8 parts of triethanolamine, 8 parts of glycerin.

[0049] 2. The micro-arc oxidation process parameters are different. In this embodiment, the reaction times of the first, second, and third stages are respectively: 10, 10, and 5 min. The positive voltage of the bipolar DC pulse power supply in each stage is 600V, and the negative The voltages are all 250V, the frequencies are all 500Hz, the duty ratios of the positive and negative voltages are both 20%, and the temperature of the electrolyte is about 40°C.

[0050] The apparent morphology of the finished sample prepared in this example is similar to that of Example 1.

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Abstract

An anti-corrosion treatment method for aluminum alloy is characterized by comprising the following steps: 1, pretreatment: grinding and polishing the surface of an aluminum alloy sample till no obvious scratch exists on the surface, then carrying out copper removal treatment on the surface of the aluminum alloy sample through a chemical method, and then carrying out cleaning and drying for use; 2, micro-arc oxidation treatment: immersing the pretreated aluminum alloy sample into an electrolyte, taking the aluminum alloy sample as an anode, performing micro-arc oxidation treatment by using a bipolar direct-current pulse power supply to obtain a sample with a micro-arc oxidation layer, and then cleaning and drying the sample; and 3, hole sealing treatment: immersing the sample subjected to micro-arc oxidation treatment in a reaction kettle filled with a water-soluble sealing agent, vacuumizing to-0.095 MPa, and maintaining the pressure for 20-40 minutes; and then curing the sealing agent by using a water bath method at the curing temperature of 80-95 DEG C for 15-50 minutes, and finally cleaning and drying to obtain a finished product sample. Compared with the prior art, the corrosion resistance of the aluminum alloy can be improved.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an aluminum alloy, particularly a method for anticorrosion treatment of ZL205A aluminum alloy. Background technique [0002] With the development of aviation, aerospace, automobile and other industries, the research and development of high-performance materials has become more and more important, and the performance characteristics of materials such as high hardness, light weight, and corrosion resistance have become more and more important. Aluminum and its alloys are rich in resources and have the advantages of high strength, good processing and welding characteristics, etc., and are widely used in aviation, aerospace and civil fields. Among them, cast aluminum alloys are widely used in the aviation field, mainly as structural materials. [0003] In the 1960s and 1970s, the Beijing Institute of Aeronautical Materials developed ZL205A high-strength c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/06C25D11/16C25D11/24
CPCC25D11/04C25D11/16C25D11/06C25D11/24C25D11/026C25D11/024Y02P10/20
Inventor 王红杰陈刚杨晓禹吴俞钱坤明郑子云
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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