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Preparation method for microarc oxidation/hydrothermal treatment composite film on surface of magnesium alloy

A technology of micro-arc oxidation and hydrothermal treatment, which is applied in anodic oxidation, metal material coating process, coating, etc., can solve the problems of poor biological activity and poor corrosion resistance of magnesium alloys, and achieve improved corrosion resistance and good uniformity , the effect of high bonding strength

Inactive Publication Date: 2012-07-11
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor corrosion resistance and poor biological activity of existing magnesium alloys. The present invention provides a method for preparing a composite film layer of micro-arc oxidation / hydrothermal treatment on the surface of magnesium alloys.

Method used

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  • Preparation method for microarc oxidation/hydrothermal treatment composite film on surface of magnesium alloy
  • Preparation method for microarc oxidation/hydrothermal treatment composite film on surface of magnesium alloy
  • Preparation method for microarc oxidation/hydrothermal treatment composite film on surface of magnesium alloy

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specific Embodiment approach 1

[0020] Specific embodiment one: this embodiment is the preparation method of the micro-arc oxidation / hydrothermal treatment composite film on the surface of magnesium alloy, which is realized through the following steps: 1. Preparation of the micro-arc oxidation film on the surface of magnesium alloy: the oxide film will be removed The magnesium alloy is placed in the electrolyte as the anode, and the stainless steel plate is used as the cathode, and the micro-arc oxidation reaction is carried out for 5-20 minutes, and then the magnesium alloy is taken out, rinsed and dried, and the micro-arc oxidation film is obtained on the surface of the magnesium alloy; The concentration is 3.5g / L~4.5g / L sodium hydroxide and 4.5g / L~5g / L sodium hexametapolyphosphate, the solvent is water, the temperature of the electrolyte is controlled at 15~40℃, micro arc Oxidation process parameters are: constant power 136W, current density 2A / cm 2 , the frequency is 2000Hz;

[0021] 2. Place the magnes...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the electrolyte is composed of sodium hydroxide with a concentration of 3.8g / L~4.2g / L and hexabia Sodium polyphosphate. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0027] Embodiment 3: The difference between this embodiment and Embodiment 1 is that in step 1, the electrolyte consists of sodium hydroxide with a concentration of 4g / L and sodium hexametapolyphosphate of 4.8g / L. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a preparation method for a microarc oxidation / hydrothermal treatment composite film on the surface of a magnesium alloy. The problem that the existing magnesium alloy is poor in corrosion resistance and bioactivity is solved. A microarc oxidation film is prepared on the magnesium alloy by using a microarc oxidation method, and then a bioceramic film is obtained by using hydrothermal treatment. Hydrothermal reaction liquid is composed of sodium hydroxide, calcium acetate and sodium hexametapolyphosphate. In the preparation method, the microarc oxidation is combined with the hydrothermal treatment; calcium and phosphorus are introduced to the surface of the microarc oxidation film by using the hydrothermal treatment; in addition, holes in the ceramic film are blocked by using hydrothermal treatment; therefore, corrosive media are effectively prevented from entering; the corrosion resistance of the composite film is effectively improved; and the corrosion resistance of the composite film to simulated body fluid is greatly improved by approximately 2 orders of magnitude.

Description

technical field [0001] The invention relates to a preparation method of a micro-arc oxidation / hydrothermal treatment composite film on the surface of a magnesium alloy. Background technique [0002] Since the 20th century, a variety of metal-based biomaterials (such as stainless steel, cobalt-chromium-molybdenum alloys, titanium alloys, and nickel-titanium shape memory materials, etc.) have been successfully developed, and some of these biological hard tissue implant materials have been actually used clinically. Wear and corrosion in human tissue may produce harmful wear debris and metal cations, and even make the device invalid. Compared with polymer or ceramic materials, magnesium alloy materials have many outstanding characteristics. ① High safety: Magnesium is the second most important element in the human body after calcium, sodium and potassium, and the daily requirement of adults exceeds 350mg [ , and excess magnesium can be excreted through urine, so magnesium will...

Claims

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Application Information

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IPC IPC(8): C25D11/30C23C18/02C23C18/00
Inventor 姚忠平夏琦兴张亚军姜兆华
Owner HARBIN INST OF TECH
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