Method for preparing zirconium oxide coating on magnesium alloy surface

A magnesium alloy and zirconia technology, which is applied in anodic oxidation, electrolytic inorganic material coating, etc., can solve the problems of complex zirconia coating equipment, poor bonding of the substrate, and thermal influence of the substrate, and achieve excellent thermal and mechanical properties. Strength, the effect of improving product performance

Inactive Publication Date: 2009-11-18
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing zirconia coating on the surface of magnesium alloy in order to solve the existing problems such as complex equipment for preparing zirconia coating on the surface of magnesium alloy, high cost, thermal influence on the substrate, and poor bonding with the substrate. Methods

Method used

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  • Method for preparing zirconium oxide coating on magnesium alloy surface

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specific Embodiment approach 1

[0009] Embodiment 1: The steps of the method for preparing a zirconia coating on the surface of a magnesium alloy in this embodiment are as follows: 1. Electrolyte preparation: first dissolve phosphoric acid and / or phosphate in distilled water, and then add potassium hexafluorozirconate while stirring 1-10g of potassium hexafluorozirconate, 0.5-10ml of phosphoric acid and / or 0.5-6g of phosphate are added to each liter of electrolyte; 2. Polish the magnesium alloy smooth and then wash it with water; The magnesium alloy is placed in the electrolyte as the positive electrode, and the stainless steel plate is used as the negative electrode. The control range of the temperature of the electrolyte is between 10 and 40°C. The micro-arc oxidation power supply is used for power supply. The peak voltage range of the micro-arc oxidation power supply is 300-700V. Both the positive and negative phase current densities are 200-900A / m 2 , the power frequency is 60-2000Hz, and the reaction is...

specific Embodiment approach 2

[0012] Specific embodiment two: In this embodiment, in step one, the phosphate is one or more of sodium dihydrogen phosphate, potassium dihydrogen phosphate, and sodium polyphosphate. Others are the same as in the first embodiment.

[0013] When the phosphate is a mixture of sodium dihydrogen phosphate, potassium dihydrogen phosphate and sodium polyphosphate, mix them in any ratio.

specific Embodiment approach 3

[0014] Embodiment 3: In this embodiment, 2-5 g of potassium hexafluorozirconate is added to each liter of electrolyte solution in step 1. Others are the same as in the first embodiment.

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Abstract

A method for preparing a zirconia coating on the surface of a magnesium alloy relates to a method for preparing the coating. The invention solves the existing problems of complex equipment for preparing zirconia coating on the surface of magnesium alloy, high cost, thermal influence on the base body, weak combination with the base body, and the like. The steps of the method of the present invention are as follows: 1. prepare electrolyte; 2. polish the magnesium alloy smoothly and then wash it with water; Between 10 and 40°C, use a micro-arc oxidation power supply to supply power, and react under constant current or constant voltage for 5 to 60 minutes; 4. Take out the magnesium alloy treated in step 3 and wash it with water, dry it at room temperature or at 60 ~ Dry at 90°C. The method of the invention reduces cost, improves product performance, and is suitable for industrial production. The method of the invention has good bonding force between the coating and the substrate, smooth surface, small hole diameter, good corrosion resistance and ceramic appearance.

Description

technical field [0001] The invention relates to a method for preparing a coating. Background technique [0002] Magnesium is the lightest metal structural material, and its specific strength and specific stiffness exceed other metals, and it is a popular "ultra-light metal". In addition, it also has superior machining performance, good electromagnetic shielding performance, shock absorption, high thermal conductivity, high die-casting productivity, good low temperature performance, superconductivity and hydrogen storage performance, so it is known as "21st century green "Engineering metals" have broad application prospects in industries such as automobiles, electronics, and aerospace. However, magnesium alloy has low surface hardness and poor corrosion resistance, which greatly limits its application. For this reason, people have carried out a lot of research on magnesium alloy surface strengthening technology, such as plasma spraying, laser melting and other physical meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C25D9/06
Inventor 姚忠平姜兆华王福平吴振东
Owner HARBIN INST OF TECH
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