Micro-arc oxidation electrolyte with low calcium-phosphorus ratio

A technology of micro-arc oxidation and electrolyte, which is applied in the direction of electrolytic coating, anodic oxidation, surface reaction electrolytic coating, etc., can solve the problems of unable to maintain support function and hinder wound healing, etc., and achieve good biological performance and biocompatibility Good, good corrosion resistance effect

Active Publication Date: 2017-09-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium degrades too quickly in the human body to maintain support before new bone tissue grows, and the hydrogen gas generated by the degradation is deposited around the implant, hindering wound healing and increasing the pH around the implant value, even alkalosis

Method used

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  • Micro-arc oxidation electrolyte with low calcium-phosphorus ratio
  • Micro-arc oxidation electrolyte with low calcium-phosphorus ratio
  • Micro-arc oxidation electrolyte with low calcium-phosphorus ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. The micro-arc oxidation film layer prepared in this experiment involves three different electrolyte systems, namely: calcium carbonate is used as the calcium source, and the calcium-phosphorus molar ratio is set to 1:3, 1:4 and 1:5 , respectively defined as C3, C4 and C5. In this experiment, the performance of the micro-arc oxidation film prepared under the above three different calcium source electrolyte systems was systematically studied, and the optimal calcium-phosphorus molar ratio under the above-mentioned calcium carbonate calcium source was given.

[0039] 2. Experimental materials and methods

[0040] 2.1 Substrate and film preparation

[0041] The substrate used in the experiment is a self-cast Mg-2Sr alloy, and the specific steps are: using 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 tools for casting need to be preheated to 2...

Embodiment 2

[0087] The micro-arc oxidation film layer prepared in this example involves three electrolyte systems containing different calcium sources, including calcium gluconate, which has been studied more, and calcium lactate, calcium carbonate, etc., which have been less studied. The calcium contents of the above three calcium sources are 9%, 13% and 40% respectively. The calcium content in the organic calcium sources calcium gluconate and calcium lactate is significantly lower than that in the inorganic calcium source calcium carbonate. This experiment systematically compared and studied the performance of the micro-arc oxidation film prepared under the above three different calcium source electrolyte systems, and showed the difference between the micro-arc oxidation film prepared by organic calcium and inorganic calcium.

[0088] 2. Experimental materials and methods

[0089] 2.1 Substrate and film preparation

[0090] The substrate used in the experiment is a self-cast Mg-2Sr al...

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Abstract

The invention provides micro-arc oxidation electrolyte with low calcium-phosphorus ratio. The micro-arc oxidation electrolyte comprises acid containing phosphorus or phosphate, and calcium carbonate, wherein Ca / P is not more than 1 / 2. Calcium phosphorus film layers XRD and FT-IR are prepared on the surface of a self-made Mg-2Sr alloy through a micro-arc oxidation technology by adopting constant forward voltage and negative voltage; infrared testing results show that phases contained in a micro-arc oxidation film layer before dipping in simulating body liquid mainly are Mg, MgO, Sr2Mg17, MgF2, CaO, CaF2, Ca3(PO4)2(TCP) and the like; and in addition, such new phases as Ca2P2O7, Mg(OH)2, HA, Sr-HA are detected in the dipped film layer. The micro-arc oxidation film layer prepared by adopting the method has typical microhole structure; obvious micro cracks are not discovered; the content of the calcium-phosphorus phase in granular corrosion products on the surface of the micro-arc oxidation film layer is higher; and the biocompatibility and the biological activity are excellent. The micro-arc oxidation film layer is higher in corrosion resistance compared with a basal body, and is improved by two or more magnitude orders compared with traditional high-calcium low-phosphorus electrolyte.

Description

technical field [0001] The invention belongs to the field of micro-arc oxidation of magnesium alloys, and relates to a micro-arc oxidation electrolyte with a low calcium-phosphorus ratio. Background technique [0002] As a biodegradable implant material, magnesium alloy has the following advantages: the density and elastic modulus are closer to bone tissue, which can effectively reduce the stress shielding effect, thereby promoting the growth of bone tissue; it has good physical and mechanical properties, Suitable for bone tissue repair and replacement; magnesium is a basic element contained in the human body, non-toxic to the human body, and its dissolution process does not produce any side effects; magnesium in the skeletal system is conducive to bone growth and bone strength. However, the ideal biodegradable magnesium alloy also needs to achieve good mechanical strength and integrity, high initial corrosion resistance after implantation, uniform and controllable degradati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30A61L27/04A61L27/32A61L27/54
CPCA61L27/047A61L27/32A61L27/54A61L2400/18A61L2430/02C25D11/024C25D11/026C25D11/30
Inventor 于慧君高丹丹陈传忠
Owner SHANDONG UNIV
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