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Method for preparing magnesium-based ceramic coating by micro-arc oxidation-electrophoretic deposition

A micro-arc oxidation and electrophoretic deposition technology, which is applied in coating, anodizing, electrolytic coating, etc., can solve the problems of poor bonding force, affecting the application of bioceramic coating materials, and weak corrosion resistance, and achieve coating The effect of increased toughness, improved adhesion, and enhanced corrosion resistance

Inactive Publication Date: 2013-07-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The direct use of micro-arc oxidation to prepare bioceramic coatings containing hydroxyapatite (HA) has the defects of brittleness, poor bonding force and weak corrosion resistance, which affect the clinical application of bioceramic coating materials

Method used

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  • Method for preparing magnesium-based ceramic coating by micro-arc oxidation-electrophoretic deposition
  • Method for preparing magnesium-based ceramic coating by micro-arc oxidation-electrophoretic deposition
  • Method for preparing magnesium-based ceramic coating by micro-arc oxidation-electrophoretic deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Magnesium-based ceramic coating prepared by micro-arc oxidation method in electrolyte without adding nanopowder

[0031] Electrolyte final concentration composition: Na 2 SiO 3 10H2 O17.5g, NaF10.0g, NaOH5.5g, 3ml ethylene glycol, deionized water 1L.

[0032] (1) Pretreatment: AZ31B magnesium alloy 60mm×20mm×2mm is made into a rectangular sheet, polished with 280#, 500#, 800#, 1200# metallographic sandpaper to remove surface oxides, and then placed in absolute ethanol Perform ultrasonic cleaning for 5-10 minutes, and dry naturally at room temperature to obtain the pretreated magnesium alloy;

[0033] (2) Micro-arc oxidation: immerse the pretreated magnesium alloy obtained in step (1) as an anode in the electrolyte, use a micro-arc oxidation stainless steel electrolytic cell as a cathode, and use a 30kW DC pulse micro-arc oxidation device at a current of 10A / dm 2 , with a duty ratio of 37.5%, micro-arc oxidation for 10 minutes at an electrolyte temperature ...

Embodiment 2

[0034] Example 2 Magnesium-based Ceramic Coating Prepared by Micro-arc Oxidation in Electrolyte Added with Nano Powder

[0035] Electrolyte: Y 2 o 3 Nano powder (100nm) 1.0g, ZrO 2 Nano powder (50nm) 5g, Na 2 SiO 3 10H 2 O17.5g, NaF10.0g, NaOH5.5g, 3ml ethylene glycol, deionized water 1L, stir to form a suspension when used.

[0036] Electrophoretic deposition solution: Na 3 PO 4 10.0g, 3.0g HA nanopowder (100nm), 3ml ethylene glycol, 1L deionized water, stir with a magnetic stirrer for 2h, then age for 6h, and use the aged anionic turbid upper layer as the electrophoretic deposition solution.

[0037] The final concentration of simulated body fluid consists of (solvent is deionized water):

[0038]

[0039] (1) Pretreatment: AZ31B magnesium alloy 60mm×20mm×2mm is made into a rectangular sheet, polished with 280#, 500#, 800#, 1200# metallographic sandpaper to remove surface oxides, and then placed in absolute ethanol Perform ultrasonic cleaning for 5-10 minutes, an...

Embodiment 3

[0044] The difference from Example 1 is that the micro-arc oxidation treatment time is 20min, 10ml ethylene glycol, and other operations are the same as in Example 1 to prepare a magnesium alloy micro-arc oxidation ceramic coating. The results show that: the main phase of the coating is: MgO, MgF 2 , Mg 2 SiO 4 and MgAl 2 o 4 . The surface micro-morphology of the micro-arc oxidation ceramic coating shows that the diameter of micropores on the surface of the coating is larger than that in Example 1, the number of micropores is reduced, and the number of microcracks is increased. However, the thickness of the coating is increased, and the corrosion resistance is enhanced.

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Abstract

The invention discloses a method for preparing a magnesium-based ceramic coating by micro-arc oxidation-electrophoretic deposition. The method comprises the following steps of: immersing preheated magnesium alloy taken as an anode in an electrolyte, taking a micro-arc oxidation stainless steel electrolytic cell as a cathode, adopting a direct-current pulsed micro-arc oxidation device, carrying out micro-arc oxidation for 10-25 minutes under the conditions that the electric current is 10-20A / dm<2>, the duty ratio is 37.5-50%, and the temperature of the electrolyte is 20-30 DEG C, taking out the anode, naturally drying, thus obtaining magnesium alloy subjected to micro-arc oxidation; immersing the magnesium alloy subjected to micro-arc oxidation and taken as the anode in electrophoretic deposition liquid, taking the stainless steel electrolytic cell as the cathode, adopting a pulsed power supply, carrying out electrophoretic deposition treatment for 10-30 minutes under the conditions that the voltage is 250-350V, and the duty ratio is 37.5-50%, naturally cooling, thus obtaining the magnesium-based ceramic coating. The adhesive force of the biological nanometer coating is obviously enhanced, the toughness and the corrosion resistance of the coating are improved, and the coating has certain biological activity.

Description

(1) Technical field [0001] The invention relates to a method for preparing a micro-arc oxidation-electrophoretic deposition nano-biological ceramic coating, in particular to a method for preparing a magnesium-based ceramic coating by using the micro-arc oxidation-electrophoretic deposition. (2) Background technology [0002] Bone implant materials are an important part of biomedical materials. Because of their prominent applications and demands in the medical field, they are the focus of material researchers from all over the world. Due to changes in bone composition due to service conditions and age, bones are often damaged by "extreme" external forces, resulting in fractures, cracks, and bone defects. At this time, it is necessary to use external or internal bone The implant / fixation system promotes bone remodeling or fracture healing. Biomedical metal materials have established an important position of metal materials in biomedical materials due to their excellent mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30C25D13/02
Inventor 熊缨卢超
Owner ZHEJIANG UNIV OF TECH
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