Micro-arc oxidation treatment method of heat-resistant cast rare earth magnesium alloy

A technology of micro-arc oxidation and treatment method, which is applied in the direction of anodic oxidation, etc., to achieve the effect of simple equipment, excellent corrosion resistance and low cost

Inactive Publication Date: 2010-04-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And there is no report on using this device to process heat-resistant cast rare earth magnesium alloys

Method used

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  • Micro-arc oxidation treatment method of heat-resistant cast rare earth magnesium alloy
  • Micro-arc oxidation treatment method of heat-resistant cast rare earth magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of electrolyte solution

[0031] Dissolve sodium silicate with distilled water, and then pour it into the electrolytic tank to make the concentration 5g / L; auxiliary agents, additives and pH regulators also need to be dissolved in distilled water and then poured into the electrolytic tank, the concentration of sodium fluoride is 8g / L, the concentration of glycerin is 10mL / L, and the concentration of potassium hydroxide is 8g / L.

[0032] (2) Pretreatment of heat-resistant cast rare earth magnesium alloy

[0033] The size of the alloy sample used is: 25mm×17mm×8mm, and the sample is passed through 300 # and 600 # Grinding and deburring with water abrasive paper;

[0034] Prepare a sodium hydroxide degreaser solution with a concentration of 100g / L. Put the sample into this solution, soak it at 60°C for 20 minutes, take it out, rinse it with clean water, and then rinse it with distilled water; or, when the surface of the sample is more oily, boil it in 90...

Embodiment 2

[0040] (1) Preparation of electrolyte solution

[0041] Dissolve sodium aluminate with distilled water and pour it into the electrolytic cell to make the concentration 8g / L; then make the concentration of sodium fluoride 4g / L, the concentration of glycerin 10mL / L, and the concentration of potassium hydroxide 6g / L and dissolve it in distilled water Then pour into the electrolytic tank and stir evenly.

[0042] (2) The pretreatment of the magnesium alloy sample is carried out according to (2) in Example 1.

[0043] (3) Sample MAO processing

[0044] Put the sample to be treated in the electrolyte, and use the voltage regulator to quickly adjust the arcing voltage to 200V. After the spark discharge occurs on the surface of the sample, the current value gradually drops to the range of 0.4 amperes with the formation of the ceramic film on the surface of the sample. Within this range, keep the current value unchanged. After staying for 3 seconds, increase the voltage to make the c...

Embodiment 3

[0047] (1) Preparation of electrolyte solution

[0048] Dissolve sodium phosphate with distilled water and pour it into the electrolytic cell to make the concentration 6.5g / L; dissolve sodium fluoride with distilled water to a concentration of 4g / L, glycerin to a concentration of 10mL / L, and potassium hydroxide to a concentration of 4g / L Pour into the electrolytic tank, stir evenly, and set aside.

[0049] (2) Pretreatment of magnesium alloy samples

[0050] Carry out by (2) in embodiment 1.

[0051] (3) MAO treatment

[0052] Put the sample to be processed in the electrolyte (1), and quickly adjust the arcing voltage to 200V with a voltage regulator. After spark discharge occurs on the surface of the sample, the current value gradually increases with the formation of the ceramic film on the surface of the sample. Drop to the range of 0.5 ampere, keep the current value in this range, after staying for 3 seconds, increase the voltage to make the current rise gradually at an ...

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Abstract

The invention relates to a micro-arc oxidation treatment method of a heat-resistant cast rare earth magnesium alloy. The method has the advantages of simple equipment, low cost and no point discharge phenomenon. The heat-resistant cast rare earth magnesium alloy processed by the method has excellent corrosion resistance, when using the neutral salt spray (NSS) method in Corrosion-resistant testing method of the metal deposits and conversion coatings for the light industrial products of QB/T 3826-1999 for testing, taking sodium chloride solution with the weight percent of 5%, keeping the temperature constant at 35 DEG C plus or minus 1 DEG C and meeting the neutral salt spray-resistant test conditions, the heat-resistant cast rare earth magnesium alloy is rated nine grade according to Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates-Rating of test specimens and manufactured articles subjected to corrosion tests of GB/T 6461-2002. The corrosion resistance is more than 96 hours.

Description

technical field [0001] The invention relates to a micro-arc oxidation treatment method for heat-resistant casting rare earth magnesium alloy. Background technique [0002] Micro-arc oxidation (MAO) is to form a spark discharge on the surface of magnesium alloy through the matching adjustment of pulse electrical parameters and electrolyte, and form a layer of ceramics on the surface of magnesium alloy in situ through the joint action of thermochemistry, electrochemistry and plasma chemistry. Membrane surface treatment technology. [0003] Since the United States AHC company first launched the MAGOXID-COAT MAO process for magnesium alloy treatment, the United States, Germany, Russia and other countries have achieved certain results in this technology, and the equipment has changed from DC power supply to unidirectional pulse power supply, AC power supply, asymmetric AC power supply has been changed to pulsed AC power supply now (Research Progress of Microarc Oxidation Technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 潘利华李俊玲常江常宇张伯杰张小勤
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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