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Method for lowering unit energy consumption of high-silicon aluminum alloy microarc oxidation

A high-silicon aluminum alloy and micro-arc oxidation technology, which is applied in anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problems of low pretreatment efficiency, large environmental pollution, low heat treatment efficiency, etc., and achieve a reduction in unit energy low energy consumption, high processing efficiency, and reduced adverse effects

Active Publication Date: 2015-09-16
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The publication number is CN101880904A. In the patent, the anodic oxidation method is used for pretreatment, but the pretreatment efficiency of this method is low (the anodic oxidation treatment time is as long as 50 minutes)
In addition, the concentrated sulfuric acid solution used in the pretreatment process is more polluting to the environment.
In the literature (Wang Xiaojun, Liu Xiangdong, Liu Yongzhen, etc. The effect of pre-heat treatment on the micro-arc oxidation layer of ZAlSi12Cu2Mg1 aluminum alloy [J]. Journal of Materials Heat Treatment, 2008, 29 (1): 133-136.) The heat treatment method is used for pretreatment, But heat treatment efficiency is low (heat treatment time up to 5 hours)

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  • Method for lowering unit energy consumption of high-silicon aluminum alloy microarc oxidation
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  • Method for lowering unit energy consumption of high-silicon aluminum alloy microarc oxidation

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Embodiment 1

[0034] This embodiment takes ZL104 aluminum alloy as an example. The content of each element on the surface of ZL104 aluminum alloy is shown in Table 1.

[0035] Table 1 The content of each element on the surface of ZL104

[0036]

[0037] It can be seen from Table 1 that the surface of ZL104 aluminum alloy mainly contains Al, Si and O, and its surface silicon content is 15.24%.

[0038] The method for reducing the unit energy consumption of high-silicon aluminum alloy micro-arc oxidation in this embodiment comprises the following steps:

[0039] (1) Prepare Ti / Zr pre-passivation film on the surface of high-silicon aluminum alloy:

[0040] Continuously polish the ZL104 aluminum alloy with 100#, 400#, 600#, 800#, 1000# SiC sandpaper until the surface is smooth and the scratches are consistent; after industrial pickling and mixed pickling, and rinse the surface with distilled water, Soak in passivation solution to prepare titanium / zirconium passivation film; in passivation...

Embodiment 2

[0046] This embodiment takes ZL104 aluminum alloy as an example. The method for reducing the unit energy consumption of high-silicon aluminum alloy micro-arc oxidation in this embodiment comprises the following steps:

[0047] (1) Ti / Zr passivation film is prepared on the surface of ZL104 aluminum alloy:

[0048] Continuously polish the ZL104 aluminum alloy with 100#, 400#, 600#, 800#, 1000# SiC sandpaper until the surface is smooth and the scratches are consistent; after industrial pickling and mixed pickling, and rinse the surface with distilled water, Soak in passivation solution to prepare titanium / zirconium passivation film; in passivation solution, each liter of deionized water contains 4g tannic acid, 4g fluotitanic acid, 2g fluozirconic acid, 1g sodium metavanadate; after 3 minutes of film formation Take out and dry;

[0049] (2) Carry out micro-arc oxidation treatment: prepare micro-arc oxidation electrolyte, weigh 12g Na at room temperature 2 SiO 3 2. Dissolve 2g...

Embodiment 3

[0051] According to the method in Example 1, a high-silicon aluminum alloy covered with a pre-passivation film was prepared.

[0052] Prepare micro-arc oxidation electrolyte, weigh 8g Na at room temperature 2 SiO 3 1. Dissolve 1g NaOH in 1L deionized water, and use a magnetic stirrer to fully dissolve it. After the solution was prepared, the ZL104 aluminum alloy substrate and the high-silicon aluminum alloy covered with a pre-passivation film were subjected to micro-arc oxidation treatment using a bipolar pulse power supply. The relevant parameters were set as follows: the positive and negative current densities were 10A / dm 2 and 1A / dm 2 , frequency 400Hz, positive and negative duty cycle 30%, positive and negative pulse ratio 1:1, processing time 15min. After the micro-arc oxidation treatment, the sample is taken out, rinsed repeatedly with deionized water and dried to obtain the micro-arc oxidation ceramic film. The voltage-time curve in the micro-arc oxidation process...

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Abstract

The invention discloses a method for lowering unit energy consumption of high-silicon aluminum alloy microarc oxidation. According to the method, a Ti / Zr pre-passivating film is firstly prepared on the surface of the high-silicon aluminum alloy, and then microarc oxidation treatment is performed. The process of preparing the Ti / Zr pre-passivating film on the surface of the high-silicon aluminum alloy comprises the following steps: (1) pretreating the high-silicon aluminum alloy; (2) preparation of the Ti / Zr passivating film on the surface of the high-silicon aluminum alloy: (2-1) preparing a passivating liquid: every liter of deionized water contains 1-5g of tannin, 1-4g of hydrofluotitanic acid, 1-2g of fluorozirconic acid and 1-4g of sodium metavanadate; and (2-2) immersing the high-silicon aluminum alloy in the passivating liquid, and treating at 25 DEG C for 1-4 minutes. The method lowers the adverse effect of silicon on microarc oxidation, and has the effects of shortening the arcing time in the cast aluminum-silicon alloy microarc oxidation process and lowering the unit energy consumption under the conditions of simple technique, high efficiency and environmental protection.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface treatment, in particular to a method for reducing unit energy consumption of high-silicon aluminum alloy micro-arc oxidation. Background technique [0002] Al-Si series alloys have the characteristics of high specific strength, good weldability and thermal expansion, and low price, and are widely used in the fields of mechanical equipment, aerospace, and electronic packaging. However, its poor corrosion resistance and wear resistance limit its further application. With the continuous development of modern industry, the performance requirements of materials are getting higher and higher. For this reason, it is usually necessary to carry out surface treatment on the cast aluminum alloy before use to improve its hardness, wear resistance, corrosion resistance and other properties and prolong its service life. [0003] As a new surface treatment technology developed from anodic oxidation, micro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/16
Inventor 张果戈董文潇李文芳于非
Owner SOUTH CHINA UNIV OF TECH
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