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Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof

A technology of micro-arc oxidation and composite coating, which is applied in the direction of coating, anodic oxidation, electrolytic coating, etc., can solve the problems of poor comprehensive performance and achieve the effects of improved comprehensive performance, high bonding force and simplified process

Active Publication Date: 2014-08-06
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its comprehensive performance is not as good as that of the electrophoretic composite coating after phosphating;

Method used

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  • Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof
  • Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof
  • Magnesium alloy microarc oxidation-electrophoresis composite coating and preparation method thereof

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Embodiment 1

[0038] The magnesium alloy micro-arc oxidation-electrophoretic composite coating of this embodiment is composed of a ceramic layer covered on the surface of the magnesium alloy after micro-arc oxidation treatment and a deposition layer deposited on the surface of the ceramic layer after electrophoresis treatment. The ceramic layer The thickness of the deposited layer is 25 μm, the surface roughness Ra is 3.0 μm, and the porosity is 25%; the thickness of the deposited layer is 35 μm.

[0039] The preparation method of the magnesium alloy micro-arc oxidation-electrophoretic composite coating of the present embodiment comprises the following steps:

[0040] Step 1. After cleaning the AZ91D magnesium alloy with deionized water, place it in the micro-arc oxidation electrolyte, use the magnesium alloy as the anode and stainless steel as the cathode, and maintain the temperature of the micro-arc oxidation electrolyte at 20°C to 40°C. Using a pulse power supply, under the conditions o...

Embodiment 2

[0047] The magnesium alloy micro-arc oxidation-electrophoretic composite coating of this embodiment is composed of a ceramic layer covered on the surface of the magnesium alloy after micro-arc oxidation treatment and a deposition layer deposited on the surface of the ceramic layer after electrophoresis treatment. The ceramic layer The thickness of the deposited layer is 35 μm, the surface roughness Ra is 4.5 μm, and the porosity is 40%; the thickness of the deposited layer is 45 μm.

[0048] The preparation method of the magnesium alloy micro-arc oxidation-electrophoretic composite coating of the present embodiment comprises the following steps:

[0049] Step 1. After cleaning the MB15 magnesium alloy with acetone, place it in the micro-arc oxidation electrolyte, use the magnesium alloy as the anode, and use the stainless steel as the cathode. Power supply, micro-arc oxidation treatment for 40 minutes under the conditions of voltage of 650V, frequency of 300Hz, and duty ratio ...

Embodiment 3

[0053] The magnesium alloy micro-arc oxidation-electrophoretic composite coating of this embodiment is composed of a ceramic layer covered on the surface of the magnesium alloy after micro-arc oxidation treatment and a deposition layer deposited on the surface of the ceramic layer after electrophoresis treatment. The ceramic layer The thickness of the deposited layer is 18 μm, the surface roughness Ra is 3.27 μm, and the porosity is 29.5%; the thickness of the deposited layer is 31 μm.

[0054] The preparation method of the magnesium alloy micro-arc oxidation-electrophoretic composite coating of the present embodiment comprises the following steps:

[0055] Step 1. After the ZM6 magnesium alloy is cleaned with ethyl acetate, it is placed in the micro-arc oxidation electrolyte, the magnesium alloy is used as the anode, and the stainless steel is used as the cathode. Pulse power supply, under the conditions of voltage 450V, frequency 300Hz, and duty cycle 20%, micro-arc oxidatio...

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Abstract

The invention provides a magnesium alloy microarc oxidation-electrophoresis composite coating which consists of a ceramic layer and a deposition layer. The ceramic layer is covered on the surface of magnesium alloy through microarc oxidation treatment and the deposition layer deposits on the surface of the ceramic layer through electrophoresis treatment. The thickness of the ceramic layer is 15micrometers-35 micrometers, the surface roughness Ra is 2.0 micrometer -4.5 micrometer and the porosity factor is 15%-40%. The thickness of the deposition layer is 20 micrometers -45micrometers. The invention further provides a preparation method of the composite coating, which includes the following steps: firstly, carrying out microarc oxidation treatment on the magnesium alloy to obtain the ceramic layer on the magnesium alloy surface; and secondly, carrying out electrophoresis treatment on the magnesium alloy which is coated with the ceramic layer on the surface to obtain the microarc oxidation-electrophoresis composite coating. The magnesium alloy microarc oxidation- electrophoresis composite coating has excellent comprehensive performances and can fully satisfy the requirements for corrosion resistance and resistances to heat, humidity and the like of magnesium alloy coatings in China national defense military industry and aviation fields.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy surface treatment, and in particular relates to a magnesium alloy micro-arc oxidation-electrophoresis composite coating and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, good shock absorption performance, and good electromagnetic shielding performance. It has significant advantages in reducing energy consumption, reducing environmental pollution, and realizing lightweight, so it is widely used in Automobiles, electronics, weapons and equipment, national defense, aerospace and other fields. [0003] However, the standard electrode potential of magnesium alloy is extremely negative, and its corrosion resistance is very poor. After natural oxidation in the atmosphere, the oxide film formed on the surface is loose and porous, and basically has no protective effect. Therefore, magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C25D13/00
Inventor 慕伟意李争显杜继红骆瑞雪
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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