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Novel Composite Nano Additives for Micro-arc Oxidation Electrolyte and Its Application

A technology of micro-arc oxidation and electrolyte, which is applied in the field of material science, can solve the problems of insufficient research on composite nano-additives, and achieve the effects of less porosity, low thickness, and low energy consumption

Inactive Publication Date: 2018-07-03
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The study found that micro-arc oxidation mainly focuses on the optimization of electrical parameters and the adjustment of electrolyte composition, but there are not many studies on adding composite nano-additives to the electrolyte. At present, there are few reports on this aspect at home and abroad.

Method used

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  • Novel Composite Nano Additives for Micro-arc Oxidation Electrolyte and Its Application
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  • Novel Composite Nano Additives for Micro-arc Oxidation Electrolyte and Its Application

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Embodiment 1

[0013] Embodiment 1 of the present invention: new micro-arc oxidation electrolyte composite nano-additive, the basic electrolyte of micro-arc oxidation is sodium silicate electrolyte, including 10g / L sodium silicate, 2g / L sodium tungstate, 2g / L hydroxide Sodium and 2L distilled water; add new micro-arc oxidation electrolyte composite nano-additives to the basic electrolyte, and the concentrations of nano-zinc oxide and nano-titanium dioxide after adding are 2g / L and 4g / L respectively.

[0014] Micro-arc oxidation steps:

[0015] The micro-arc oxidation process adopts constant voltage mode, the sample is used as the anode, and the stainless steel electrolytic cell is used as the cathode. The sample is drilled and inserted into the aluminum wire connection, and suspended in the prepared electrolyte, the bottom of the sample is not in contact with the oxidation tank. Then turn on the power, set the predetermined process parameters (electrical parameters are set as: time 60min; f...

Embodiment 2

[0017] Embodiment 2 of the present invention: new micro-arc oxidation electrolyte composite nano-additive, the basic electrolyte of micro-arc oxidation is sodium silicate electrolyte, including 10g / L sodium silicate, 2g / L sodium tungstate, 2g / L hydroxide Sodium and 2L of distilled water; add a new type of micro-arc oxidation electrolyte composite nano-additive to the basic electrolyte, and the concentrations of the added nano-zinc oxide and nano-titanium dioxide are 1g / L and 3g / L, respectively.

[0018] The micro-arc oxidation step is the same as in Example 1. And the thickness, hardness, surface roughness, corrosion resistance, wear resistance inspection and analysis results of the micro-arc oxidation ceramic film made by this process are shown in Table 1, and its surface appearance is as follows: image 3 shown.

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Abstract

The invention discloses a novel micro-arc oxidation electrolyte composite nanometer additive and an application thereof. A mixed additive prepared from nano-zinc oxide and nano titanium dioxide is adopted and added to an electrolyte with silicate as a main film-forming agent. A high-quality ceramic film can be generated, the hardness, abrasive resistance, corrosion resistance and other comprehensive performance of the film are remarkably improved on the premise that the thickness of the generated micro-arc oxidation ceramic film layer is not large, the surface of the film is flat, porosity is low, and the number of microcracks is small. The film mainly comprises an Al matrix, an alpha-Al2O3 phase, a gamma-Al2O3 phase, Al3Ti and a titanium-zinc (Zn0.6Ti0.4) phase. The preparation process of the micro-arc oxidation film is easy to operate, and is an energy-saving environment-friendly process consuming no cathode or electrolyte. The generated micro-arc oxidation film is not large in thickness, so that the film forming time is short, energy consumption is low, production cost can be reduced, and very good economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of material science, in particular to a novel micro-arc oxidation electrolyte composite nano-additive and its application. Background technique [0002] Aluminum and its alloys have become the most widely used metal materials among non-ferrous metals because of their advantages such as high specific strength, excellent electrical conductivity, and easy processing and forming. However, the chemical properties of aluminum are very active, and it will oxidize at room temperature to form a natural oxide film on its surface. Due to the extremely thin film and low hardness, it is not enough to resist corrosion caused by harsh environments and damage caused by external friction. Therefore it must be surface treated. As a new generation of surface treatment technology, micro-arc oxidation can form a dense alumina ceramic layer on the surface of aluminum alloy, thereby greatly improving the comprehensive performance of alumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06
CPCC25D11/06
Inventor 张晓燕林廷艺黄丹黄鑫巩向鹏张俊杰
Owner GUIZHOU UNIV