A Micro-arc Oxidation Electrolyte with Low Calcium-Phosphorus Ratio

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

Active Publication Date: 2021-10-01
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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  • A Micro-arc Oxidation Electrolyte with Low Calcium-Phosphorus Ratio
  • A Micro-arc Oxidation Electrolyte with Low Calcium-Phosphorus Ratio
  • A 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 properties of the micro-arc oxidation coatings prepared under the above three different calcium source electrolyte systems, and showed the differences between the micro-arc oxidation coatings 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 M...

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Abstract

The invention relates to a micro-arc oxidation electrolyte solution with a low calcium-phosphorus ratio. The micro-arc oxidation electrolyte includes: phosphorus-containing acid or phosphate, calcium carbonate, wherein Ca / P≤1 / 2. Calcium-phosphorus film was prepared on the surface of self-cast Mg-2Sr alloy by micro-arc oxidation technology with constant positive and negative voltage. XRD and FT-IR infrared test results showed that the micro-arc oxidation film contained The phases are mainly Mg, MgO, Sr 2 Mg 17 ,MgF 2 ,CaO,CaF 2 , Ca 3 (PO 4 ) 2 (TCP), etc. In addition, Ca was also detected in the film layer after soaking 2 P 2 o 7 ,Mg(OH) 2 , HA, Sr‑HA and other new phases exist. The micro-arc oxidation coatings prepared by this method all have a typical microporous structure and no obvious micro-cracks are found. The granular corrosion products on the surface of the micro-arc oxidation coating have a high content of calcium and phosphorus phases, and the biocompatibility and Good biological activity. The micro-arc oxidation film layer has better corrosion resistance than the substrate, which is more than 2 orders of magnitude higher than the existing high-calcium and 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 Patents(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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