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Micro-arc oxidation electrolyte and micro-arc oxidation method

A micro-arc oxidation and electrolyte technology, applied in electrolytic coatings, anodic oxidation, surface reaction electrolytic coatings, etc., can solve the problems of cumbersome process and achieve the effect of simple process, easy control and good corrosion resistance

Active Publication Date: 2012-07-11
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcoming is that before the micro-arc oxidation process, it is necessary to use the dipping-pulling film method to form a silicon dioxide coating on the surface of the magnesium alloy micro-arc oxidation film, and it is necessary to carry out multiple dipping and pulling. cumbersome

Method used

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  • Micro-arc oxidation electrolyte and micro-arc oxidation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Wear-resistant agent, sealing agent and dispersant are added to the base solution with a pH of 8 at the same time. After adding, ultrasonically vibrate for 20 minutes, and then immerse the parts to be plated made of magnesium alloy in the electrolytic tank filled with micro-arc oxidation electrolyte. The piece to be plated is used as the anode, and the stainless steel plate is used as the cathode. The reaction time is 5 minutes, the electrolyte temperature is 15°C, and the current density is 5A / dm 2 The micro-arc oxidation is carried out under the micro-arc oxidation process with a voltage of 150V, so that a dense micro-arc oxidation film is formed on the surface of the workpiece to be plated. The composition of the micro-arc oxidation electrolyte is shown in Table 1. The obtained micro-arc oxidation The arc oxidation film was tested for performance, and the results are shown in Table 2.

Embodiment 2

[0024] Wear-resistant agent, sealing agent and dispersant are added to the base solution with a pH of 10 at the same time. After adding, ultrasonically vibrate for 25 minutes, and then immerse the piece to be plated made of magnesium alloy in the electrolytic cell filled with the micro-arc oxidation electrolyte. The piece to be plated is used as the anode, and the stainless steel plate is used as the cathode. The reaction time is 25 minutes, the electrolyte temperature is 35°C, and the current density is 12A / dm 2 The micro-arc oxidation is carried out under the micro-arc oxidation process condition with a voltage of 300V, so that a dense micro-arc oxidation film is formed on the surface of the workpiece to be plated. The composition of the micro-arc oxidation electrolyte is shown in Table 1. The obtained micro-arc oxidation The arc oxidation film was tested for performance, and the results are shown in Table 2.

Embodiment 3

[0026] Wear-resistant agent, sealing agent and dispersant are added to the base solution with a pH of 12 at the same time. After adding, ultrasonic vibration is performed for 30 minutes, and then the parts to be plated made of magnesium alloy are immersed in the electrolytic tank filled with micro-arc oxidation electrolyte. The piece to be plated is used as the anode, and the stainless steel plate is used as the cathode. The reaction time is 30 minutes, the electrolyte temperature is 40°C, and the current density is 15A / dm 2 , and the voltage is 550V under the micro-arc oxidation process conditions to carry out micro-arc oxidation, so that a layer of dense micro-arc oxidation film is formed on the surface of the workpiece to be plated. The composition of the micro-arc oxidation electrolyte is shown in Table 1. The obtained micro-arc oxidation The arc oxidation film was tested for performance, and the results are shown in Table 2.

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Abstract

The invention discloses a micro-arc oxidation electrolyte and a micro-arc oxidation method. The micro-arc oxidation electrolyte comprises the following components: a basic solution, a wear-resisting agent, a pore sealing agent and a dispersing agent, wherein the basic solution is phosphate and silicate aqueous solution of pH 8-12, the wear-resisting agent is graphite powder, the pore sealing agent is silica powder or alumina powder, and the dispersing agent is polyoxyethylenealkylphenol ether. The micro-arc oxidation electrolyte of the invention is simple in composition, and easy in control. Light metal parts to be plated are subjected to micro-arc oxidation using the micro-arc oxidation electrolyte of the invention, and are directly subjected to pore sealing treatment in the micro-arc oxidation process without after-treatment. The process of the invention is simple, and obtained micro-arc oxide film layer is high in hardness, and is good in abrasion resistance and corrosion resistance.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a micro-arc oxidation electrolyte and a micro-arc oxidation method. Background technique [0002] At present, light metals such as aluminum, titanium and their alloys are widely used in aerospace, automobile and electronic industries due to their light weight, high specific strength, good rolling and ductility, and easy processing. However, the surface quality of light metal materials Soft, not resistant to wear, not resistant to high temperature, and the corrosion potential of light metal is low, unstable in most media, and poor in corrosion resistance. Although the surface of light metal can form an oxide film in a natural state, it is naturally formed The oxide film is loose and porous and cannot protect the internal metal. In order to overcome the defects in the surface properties of light metals, it is necessary to oxidize the surface of light metals to form ...

Claims

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Application Information

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IPC IPC(8): C25D11/00C25D11/30C25D11/08
Inventor 姚再起李志华王春斌李莉刘强马芳武赵福全
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD
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