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A kind of micro-arc oxidation coating and its preparation method

A technology of micro-arc oxidation and coating, applied in the field of electrochemistry, can solve the problem that the polymer additive polyethylene glycol has not been systematically studied

Active Publication Date: 2019-03-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the micro-arc oxidation technology of magnesium alloys, the polymer additive polyethylene glycol (PEG 1000 ) has not been systematically studied

Method used

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  • A kind of micro-arc oxidation coating and its preparation method
  • A kind of micro-arc oxidation coating and its preparation method
  • A kind of micro-arc oxidation coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Preparation and pretreatment of matrix materials

[0056] Preparation method of magnesium alloy matrix material:

[0057] (1) Use atmosphere protection (SF 6 :CO 2 =1:200) resistance furnace melting pure magnesium (99.99%) and magnesium-strontium master alloy (Mg-21Sr (99.99%)). All raw materials and casting tools need to be preheated to 250°C

[0058](2) When the furnace temperature rises to 500°C, put in the preheated pure magnesium ingot. When the furnace temperature is 700°C, the pure magnesium is completely melted and kept for 20 minutes. Melt pure magnesium in a protective atmosphere, adjust the furnace temperature to 710°C after melting, add magnesium-strontium master alloy (Mg-21Sr (99.99%)) when the melt temperature is 710°C, and keep it warm for 20 minutes after melting completely.

[0059] (3) Fully stir the melt under a protective atmosphere, and pour it into a preheated graphite mold, and then perform homogenization annealing at 400° C. for 16 hours...

Embodiment 2

[0068] The specific composition of the electrolyte is as shown in Table 2, and other operations are the same as in Example 1.

[0069] Table 2 Microarc Oxidation Coating C Electrolyte Formula

[0070]

Embodiment 3

[0072] The specific composition of the electrolyte is shown in Table 3, and other operations are the same as in Example 1.

[0073] Table 3 Microarc Oxidation Coating D Electrolyte Formula

[0074]

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Abstract

The invention discloses a magnesium alloy surface micro arc oxidation coating and a preparation method thereof. Polyethylene glycol is added in a silicate electrolyte system, a suitable electrolyte formula is explored, then electrical parameters are further optimized during optimization of the electrolyte system, and the ceramic coating excellent in performance is prepared. The polyethylene glycol is added, so that the high bonding strength and the low porosity are formed between the magnesium alloy surface micro arc oxidation coating and a magnesium alloy matrix; the coating is uniform and compact and has certain corrosion resistance and mechanical stability, and thus repairing and growth of cell tissues around a bone implant are facilitated; and the coating has the high biocompatibility, bioactivity and other excellent performances after being subjected to SBF soaking. According to the magnesium alloy surface micro arc oxidation coating and the preparation method thereof, the coating is prepared on the surface of magnesium alloy, so that the coating has the high corrosion resistance, the moderate degradation rate and the good biocompatibility, and thus application of the magnesium alloy in the medical field is further accelerated.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a micro-arc oxidation coating on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium-based alloy implants have potential biocompatibility, osteoinductance and degradation properties, which benefit from the excellent mechanical properties, biocompatibility and spontaneous degradation properties of magnesium alloys. In terms of mechanical properties: the elastic modulus and yield strength of magnesium are closer to the natural bone of the human body, thus effectively avoiding the stress shielding effect; in terms of biocompatibility: as the fourth most abundant cation in the human body, magnesium plays an important role in the metabolism of the human body. Effect, where nearly half of the magnesium is located in the bone tissue; Degradation performance: The corrosion products produced by the implant in the body can be spontaneou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30
CPCC25D11/026C25D11/30
Inventor 陈传忠高丹丹于慧君
Owner SHANDONG UNIV
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