A Method for Reducing the Unit Energy Consumption of Micro-arc Oxidation of High-silicon Aluminum Alloy

A high-silicon aluminum alloy, micro-arc oxidation technology, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve the problems of large environmental pollution, low pretreatment efficiency, low heat treatment efficiency, etc., and achieve high treatment efficiency. , the effect of reducing unit energy consumption and reducing adverse effects

Active Publication Date: 2017-08-25
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)

Method used

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  • A Method for Reducing the Unit Energy Consumption of Micro-arc Oxidation of High-silicon Aluminum Alloy
  • A Method for Reducing the Unit Energy Consumption of Micro-arc Oxidation of High-silicon Aluminum Alloy
  • A Method for Reducing the Unit Energy Consumption of Micro-arc Oxidation of High-silicon Aluminum Alloy

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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 reducing unit energy consumption of micro-arc oxidation of high-silicon aluminum alloys. First, a Ti / Zr pre-passivation film is prepared on the surface of high-silicon aluminum alloys, and then micro-arc oxidation treatment is carried out; The surface of the alloy prepares a Ti / Zr pre-passivation film, specifically comprising the following steps: (1) pre-treating the high-silicon aluminum alloy; (2) preparing a Ti / Zr passivation film on the surface of the high-silicon aluminum alloy: (2- 1) Preparation of passivation solution: every liter of deionized water contains 1-5g tannic acid, 1-4g fluorotitanic acid, 1-2g fluorozirconic acid, 1-4g sodium metavanadate; (2-2) high silicon The aluminum alloy is soaked in the passivation solution, the treatment time is 1-4min; the treatment temperature is 25°C. The invention reduces the adverse effect of silicon on the micro-arc oxidation, and under the conditions of simple process, high efficiency and environmental protection, shortens the arc start time in the micro-arc oxidation process of cast aluminum-silicon alloy and reduces the unit energy consumption.

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 Patents(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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