Magnesium alloy surface micro-arc oxidation nanometer self-assembly metal ceramic coating and preparation method thereof

A metal-ceramic coating and nano-self-assembly technology, which is applied in the field of metal surface treatment, can solve problems such as no reports, and achieve the effects of environmentally friendly energy consumption, high energy utilization efficiency, and high-density stacking defects

Inactive Publication Date: 2013-05-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no reports at home and abroad about the composite treatment of metal-inorganic ceramic coatings on the surface of magnesium alloys, especially on the surface of the micro-arc oxidation film layer.

Method used

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  • Magnesium alloy surface micro-arc oxidation nanometer self-assembly metal ceramic coating and preparation method thereof
  • Magnesium alloy surface micro-arc oxidation nanometer self-assembly metal ceramic coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] 1. Material preparation: After cutting and grinding the AZ91D magnesium alloy, soak the sample in degreasing solution. Composition of degreasing solution: 30g / L sodium hydroxide, 10g / L sodium phosphate, 5g / L sodium silicate, 2g / L sodium pyrophosphate, and the rest is water; temperature: 50°C, time 10min.

[0044] 2. Plasma electrolytic oxidation: put the magnesium alloy sample into the plasma oxidation electrolyte, and conduct plasma electrolytic oxidation in a pulsed manner; the plasma oxidation electrolyte is: sodium hydroxide 2g / L, sodium silicate 10g / L , sodium fluoride 5g / L, sodium borate 5g / L, sodium tungstate 2g / L, and the rest is water; during the preparation of the oxide film, the electrolyte temperature is 50°C, the power supply mode is square wave pulse in positive and negative directions, forward oxidation The final voltage is 450V, and the final voltage of negative oxidation is 50V; the oxidation time is 40min, and the current density is 2A / dm 2 , the duty...

Embodiment 2

[0054] 1. Material preparation: After AZ31B magnesium alloy is cut and polished, use ultrasonic cleaning in acetone solution to degrease.

[0055] 2. Etching: The composition of the etching solution is: Na 4 P 2 o 7 10H 2 O 20g / L, Na 2 F 3g / L, NaNO 3 5g / L, the rest is water; the temperature is 50°C, and the treatment time is 2min.

[0056] 3. Plasma electrolytic oxidation: put the magnesium alloy sample into the plasma oxidation electrolyte, and conduct plasma electrolytic oxidation in a pulsed manner; the plasma oxidation electrolyte is: sodium hydroxide 2g / L, sodium silicate 15g / L , sodium fluoride 5g / L, sodium borate 3g / L, sodium tungstate 1g / L, and the rest is water; during the preparation of the oxide film, the electrolyte temperature is 40°C, the power supply mode is square wave pulse in positive and negative directions, forward oxidation The final voltage is 500V, and the negative oxidation final voltage is 50V; the oxidation time is 60min, and the current densit...

Embodiment 3

[0064] 1. Material preparation: After HP pure magnesium is cut and polished, soak the sample in degreasing solution. Degreasing liquid composition: 40g / L sodium hydroxide, 5g / L sodium phosphate, 10g / L sodium silicate, 5g / L sodium hexapolyphosphate, and the rest is water; temperature: 50°C, time 10min.

[0065]2. Plasma electrolytic oxidation: put the magnesium alloy sample into the plasma oxidation electrolyte, and conduct plasma electrolytic oxidation in a pulsed manner; the plasma oxidation electrolyte is: sodium hydroxide 3g / L, sodium silicate 10g / L , sodium fluoride 6g / L, sodium borate 5g / L, sodium tungstate 2g / L, and the rest is water; during the preparation of the oxide film, the electrolyte temperature is 30°C, the power supply mode is square wave pulse in positive and negative directions, forward oxidation The final voltage is 500V, and the final voltage of negative oxidation is 150V; the oxidation time is 60min, and the current density is 3A / dm 2 , the frequency is 1...

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Abstract

The present invention discloses a magnesium alloy surface micro-arc oxidation nanometer self-assembly metal ceramic coating and a preparation method thereof. The coating comprises a micro-arc oxidation ceramic layer, a self-assembly nanometer film and an inorganic metal ceramic coating, wherein the micro-arc oxidation ceramic layer, the self-assembly nanometer film and the inorganic metal ceramic coating are sequentially attached on the magnesium alloy surface. The preparation method comprises: carrying out plasma electrolysis oxidation on the surface of a magnesium alloy substrate to form a micro-arc oxidation ceramic coating, then carrying out dipping or high pressure spraying of a self-assembly nanometer film as a connection layer on the surface of the ceramic layer, and adopting a low temperature sintering method to prepare an inorganic metal ceramic coating on the surface of the self-assembly nanometer film. According to the present invention, the head group of the self-assembly nanometer film and the micro-arc oxidation bottom layer ceramic layer form chemical bonding, and a sealing treatment is performed on micro-pores of the micro-arc oxidation film; a high density cross-linking effect on active function groups in the inorganic metal ceramic coating by the self-assembly nanometer film is achieved through the end group; and the magnesium alloy surface composite protection coating prepared by using the method has characteristics of good bonding strength, corrosion resistance, scratching resistance and high hardness.

Description

technical field [0001] The invention relates to a high corrosion-resistant / wear-resistant composite protective coating on the surface of a magnesium alloy and a preparation method thereof, belonging to the technical field of metal surface treatment, in particular to a micro-arc oxidation nanometer self-assembled cermet coating on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the most potential metal structural material to meet the development of lightweight, environmental protection and performance optimization. However, the thermodynamic stability of magnesium is poor, and the oxide film structure is loose (PBR<1), resulting in poor corrosion resistance of magnesium alloys; Mechanical damage capability requirements are high. Therefore, solving the comprehensive protection problem is the key to promoting the application of magnesium alloys. [0003] Micro-arc oxidation technology has become the most p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/04B32B18/00C25D11/30B05D5/08B05D1/02B05D1/18B05D7/14
Inventor 张伟王成杜克勤王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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