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Silane coupling agent arc-suppressed micro arc oxidation electrolyte solution and micro arc oxidation film preparation method

A silane coupling agent and electrolyte solution technology, applied in the field of metal surface treatment, can solve problems such as long-term stability, and achieve the effects of good compactness, smooth coating surface and good corrosion resistance

Active Publication Date: 2015-11-18
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the silane coupling agent is preferably an epoxy functional group coupling agent that can enhance the performance of the film layer and stabilize the electrolyte. However, after hydrolysis of this type of silane coupling agent, it cannot exist stably for a long time in aqueous solution, especially in an alkaline environment.

Method used

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  • Silane coupling agent arc-suppressed micro arc oxidation electrolyte solution and micro arc oxidation film preparation method
  • Silane coupling agent arc-suppressed micro arc oxidation electrolyte solution and micro arc oxidation film preparation method
  • Silane coupling agent arc-suppressed micro arc oxidation electrolyte solution and micro arc oxidation film preparation method

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preparation example Construction

[0046] A method for preparing a micro-arc oxidation film layer on the surface of a magnesium alloy, the steps are as follows,

[0047] 1) Magnesium alloy substrate pretreatment: the magnesium alloy substrate is treated with alkali washing or other degreasing processes to remove surface oil stains;

[0048] 2) Prepare the electrolyte solution: the electrolyte solution is composed of the above-mentioned basic solution and silane coupling agent, introduce the silane coupling agent into the basic solution according to the amount, and let it stand for a period of time until the hydrolysis is completed to obtain the electrolyte solution;

[0049] 3) Micro-arc oxidation treatment: the magnesium alloy substrate treated in step 1) is used as the anode or cathode, and the stainless steel is used as the counter electrode, placed in the electrolyte solution prepared in step 2), and the constant voltage or constant current or constant power of the power supply is used Controlling, performi...

Embodiment 1

[0056] After degreasing treatment, the AZ31 magnesium alloy is placed in an electrolyte solution composed of 5g / LKOH+5g / LNaF as the anode, and stainless steel is used as the counter electrode. It is controlled by a DC pulse power supply, with a positive voltage of 350V, a negative voltage of 0V, and a frequency of 600HZ. The empty ratio is 30%, and the time is 5 minutes. After the oxidation is completed, the magnesium alloy substrate is taken out, rinsed and dried. Example 1 As a comparative example, the electrolytic solution does not include a silane coupling agent, and the surface topography of the obtained magnesium alloy substrate is shown in figure 1 .

Embodiment 2

[0058] After degreasing treatment, AZ31 magnesium alloy is placed in the electrolyte solution composed of 5g / LKOH+5g / LNaF+5ml / LKH-550 as the anode, stainless steel as the counter electrode, controlled by DC pulse power supply, positive voltage 350V, negative voltage 0V, frequency 600HZ, duty cycle 30%, time 5min. After the oxidation is completed, the magnesium alloy substrate is taken out, rinsed and dried. Its surface topography is shown in figure 2 .

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Abstract

The invention discloses a silane coupling agent arc-suppressed micro arc oxidation electrolyte solution and a micro arc oxidation film preparation method. The electrolyte solution comprises a base solution and a silane coupling agent, wherein the base solution is composed of one or two or three of inorganic salts, fluorides and hydroxides, and is alkaline; and the silane coupling agent is neutral or alkaline after hydrolysis and has a general formula of R<4-x>Si(OR'). The preparation method comprises the steps of: placing a magnesium alloy substrate serving as an anode or cathode and stainless steel serving as a counter electrode in the electrolyte solution, carrying out micro arc oxidation, taking out the magnesium alloy substrate after oxidation, washing, and drying to obtain a micro arc oxidation film layer on the surface of the magnesium alloy. The electrolyte solution can inhibit point discharge; the prepared micro arc oxidation film is controllable in structure, and has good corrosion resistance and wear resistance; a micro arc oxidation transition layer with excellent compatibility can be prepared according to the requirement of a surface composite coating layer.

Description

technical field [0001] The invention relates to metal surface treatment, in particular to a micro-arc oxidation electrolyte solution containing a silane coupling agent for arc suppression and a preparation method for a micro-arc oxidation film layer on the surface of a magnesium alloy and its products, belonging to the technical field of metal surface treatment. Background technique [0002] As a new generation of lightweight and high-strength metal structural materials, magnesium alloys have broad application prospects in the fields of automobiles, electronic communications, aerospace, and national defense. However, the chemical properties of magnesium are lively, and the naturally formed oxide film has poor compactness, which cannot provide good corrosion protection for magnesium alloy products in acidic or neutral environments, which seriously limits the wide application of magnesium alloys. [0003] Micro-arc oxidation (MAO) technology has become one of the important m...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 崔学军李明田杨瑞嵩刘春海林修洲
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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