Method for preparing zirconium oxide coating on magnesium alloy surface

A magnesium alloy, zirconia technology, applied in anodizing, electrolytic inorganic material coating and other directions, can solve the problems of complex zirconia coating equipment, weak matrix bonding, thermal influence of the matrix, etc., to achieve excellent thermal and mechanical properties, high Strength, the effect of improving product performance

Inactive Publication Date: 2008-03-12
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 a

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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 to prepare zirconia coating on magnesium alloy surface relates to a coating preparation coating method. The invention resolves the following problems in prior zirconia coating preparation on magnesium alloy surface: Complex equipment, high cost, thermal influences on the basic body and no firm binding with the basic body and etc. The invented process steps are as follows: 1. Preparing electrolyte; 2. Grinding magnesium alloy smooth before water scrubbing; 3. Putting magnesium alloy from Step 2 process into the electrolyte to gain a anode, and select stainless steel plate as a cathode; electrolyte temperature is 10 to 40 celsius degrees; power is supplied with a microarc oxidation power source, so that maintain the charged reaction for 5 to 60 minutes in constant current or constant voltage; 4. Take out the magnesium alloy through Step 3 to perform water scrubbing, and dry it in room temperature condition or in 60 to 90 celsius degrees. The invented method lowers the cost but improves product performances, for which adapts to industrialized prdocution. The invented method can receive a coating with perfect binding force with the basic body, as well as smooth surface, small pore diameter, perfect corrosion resistance and ceramic appearances.

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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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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