Solution for preparing high corrosion resistance self-sealing ceramic coating on magnesium alloy surface and its application

A technology of ceramic coating and magnesium alloy, which is applied in anodic oxidation and other directions, can solve the problems of high peak current density, etc., and achieve the effect of uniform thickness, difficult penetration and low surface roughness

Active Publication Date: 2011-12-07
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

[0004] In order to overcome the shortcomings of high peak current density during the micro-arc oxidation treatment of magnesium alloy workpieces in fluorine-containing zirconate solutions using constant pressure working mode, the purpose of the present invention is to provide a self-sealing hole with high corros

Method used

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  • Solution for preparing high corrosion resistance self-sealing ceramic coating on magnesium alloy surface and its application
  • Solution for preparing high corrosion resistance self-sealing ceramic coating on magnesium alloy surface and its application
  • Solution for preparing high corrosion resistance self-sealing ceramic coating on magnesium alloy surface and its application

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Embodiment 1

[0032] In this example, the composition of the high corrosion resistance self-sealing ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy under constant current / constant pressure mode is as follows:

[0033] 10 g / L potassium fluozirconate, 12 g / L ammonium dihydrogen phosphate, 15 g / L potassium fluoride, 6 g / L sodium citrate, 70 g / L hexamethylenetetramine and the rest of water; sample For AM60 die-cast magnesium alloy. The micro-arc oxidation power supply adopts a constant current / constant voltage pulse power supply with a frequency of 500Hz and a duty cycle of 50%. The method for preparing the ceramic coating is:

[0034] 1) Mechanical pretreatment and degreasing treatment;

[0035] Among the present invention, described mechanical pretreatment refers to that sample is ground with sandblasting or sandpaper, removes burr, surface oxide etc.; 1. Wash with 15 g / L sodium carbonate compound aqueous solution to remove general dirt, sintered ...

Embodiment 2

[0042] In this example, the composition of the high corrosion resistance self-sealing ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy under constant current / constant pressure mode is as follows:

[0043] 8 g / L sodium fluozirconate, 10 g / L sodium dihydrogen phosphate, 20 g / L ammonium fluoride, 4 g / L potassium citrate, 80 g / L hexamethylenetetramine and the balance water; sample Extruded magnesium alloy for AZ31. The micro-arc oxidation power supply adopts a constant current / constant voltage pulse power supply with a frequency of 300Hz and a duty cycle of 40%.

[0044] Its preparation method is identical with embodiment 1.

[0045] In this example, the thickness of the ceramic coating is 20 μm, and the element composition of the coating is as follows: Zr, Mg, O, F, P, and the phase structure mainly includes Mg 2 Zr 5 o 12 , t-ZrO 2 , MgF 2 , MgO.

[0046] In this embodiment, the performance parameters of the ceramic coating are as...

Embodiment 3

[0048] In this example, the composition of the high corrosion resistance self-sealing ceramic coating solution prepared by micro-arc oxidation on the surface of magnesium alloy under constant current / constant pressure mode is as follows:

[0049] 10 g / L sodium fluozirconate, 8 g / L potassium dihydrogen phosphate, 15 g / L sodium fluoride, 8 g / L potassium sodium citrate, 70 g / L hexamethylenetetramine and the rest of water; The sample is AM50 die-cast magnesium alloy. The micro-arc oxidation power supply adopts a constant current / constant voltage pulse power supply with a frequency of 1000Hz and a duty cycle of 60%.

[0050] After the magnesium alloy workpiece is clamped by a hanger, it is immersed in the above solution and then subjected to micro-arc oxidation treatment. In the micro-arc oxidation process, the magnesium alloy workpiece was oxidized by a constant current of 1.5 amps / square decimeter for 16 minutes, and the voltage was gradually increased from 0 volts to 400 volts ...

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Abstract

The invention relates to the technology for treating a magnesium alloy surface, in particular to a solution for preparing a self-hole-sealing ceramic coating with high corrosion resistance on the magnesium alloy surface and application thereof. The solution consists of the following components: 8-10g/L of fluozirconate, 8-14 g/L of dihydric phosphate, 15-20 g/L of fluoride, 3-8 g/L of citrate, 70-90 g/L of hexamethylene tetramine and the balance of water. In a constant-current constant-voltage working manner, the self-hole-sealing ceramic coating with high corrosion resistance is prepared on the magnesium alloy surface by adopting a microarc oxidation technology. The invention can overcome the disadvantages that the peak current density is too high when magnesium alloy workpieces in a fluozirconate-containing solution are subjected to the microarc oxidation treatment by adopting the constant-voltage working manner, and the film cannot be formed when the constant-current working manneris adopted in the prior art. The ceramic coating has better corrosion resistance, and the coating has uniform thickness, compactness and low surface roughness and does not need after-treatments such as hole sealing and the like; and the solution provided by the invention has simple components and readily available raw materials and is applicable to industrialization production.

Description

technical field [0001] The present invention relates to magnesium alloy surface treatment technology, specifically a solution for preparing high corrosion resistance self-sealing ceramic coating on the surface of magnesium alloy and its application. It uses micro-arc oxidation under constant current and constant pressure working mode Technology A solution for preparing a high-corrosion-resistant self-sealing ceramic coating on the surface of a magnesium alloy and a method for preparing a ceramic coating from the solution. Background technique [0002] Magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, good shock absorption and electromagnetic shielding performance, which makes magnesium alloy used in automobiles as the lightest industrial material, but the corrosion resistance of magnesium alloy is poor. Cars are inevitably exposed to corrosive environments during their service, so improving the corrosion resistance of magnesi...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 刘锋单大勇刘贤斌韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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