Micro-arc oxidation electrolyte system added with calcium lactate

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

Active Publication Date: 2017-09-26
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 system added with calcium lactate
  • Micro-arc oxidation electrolyte system added with calcium lactate
  • Micro-arc oxidation electrolyte system added with calcium lactate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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.

[0047] 2. Experimental materials and methods

[0048] 2.1 Substrate and film preparation

[0049] The substrate used in the experiment is a self-cast M...

Embodiment 2

[0096] 1. The micro-arc oxidation film layer prepared in this experiment involves three different electrolyte systems, namely: calcium lactate as the calcium source, and the calcium-phosphorus molar ratio is set to 1:3, 1:4 and 1:5 , and are defined as B3, B4, and B5, respectively. The calcium source used in the micro-arc oxidation experiment was calcium lactate Ca(C 3 h 5 o 3 ) 2 ﹒ 5H 2 O, the molar concentration of calcium ions is 0.006mol / L, and the mass concentration is 1.848g / L; the phosphorus source used in the experiment is (Na 2 PO 3 ) 6 , the concentrations are 1.836g / L, 2.448g / L and 3.060g / L respectively; the remaining electrolyte components and concentrations are KOH, 5g / L; NH 4 HF 2 ,7g / L; C 3 h 8 o3 and N(CH 2 CH 2 Oh) 3 Concentration is 5ml / L; H 2 o 2 The concentration is 7ml / L. The experimental materials and methods are the same as those described in Example 1.

[0097] 2. Experimental results

[0098] 3.1 Phase of the film layer

[0099] F...

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Abstract

The invention relates to a micro-arc oxidation electrolyte system added with calcium lactate. The micro-arc oxidation electrolyte comprises an acid containing phosphorus or a phosphate and the calcium lactate, wherein the ratio of Ca to P is smaller than or equal to 1/2. Constant positive voltage and negative voltage are adopted, through a micro-arc oxidation technology, a calcium-phosphorus film layer is prepared on the surface of self-casting Mg-2Sr alloy, XRD and FT-IR infrared test result shows that phases contained in a micro-arc oxidation film layer before being soaked in a simulated body fluid mainly are Mg, MgO, Sr2Mg17, MgF2, CaO, CaF2, Ca3(PO4)2(TCP) and the like, and, in addition, existing of new phases, such as Ca2P2O7, Mg(OH)2, HA, Sr-HA, are further detected in the film layer after being soaked. According to the micro-arc oxidation electrolyte system added with the calcium lactate, the micro-arc oxidation film layer prepared by adopting the method has a typical micro-pore structure, and moreover an obvious micro crack is not discovered; and the contents of calcium and phosphorus phases in particle-shaped corrosion products on the surface of the micro-oxidation film layer are high, and the biological performance (the biocompatibility or the bioactivity) is good. Compared with a base body, the micro-arc oxidation film layer has good corrosion resistance, and the corrosion current is enhanced by more than two orders of magnitude compared with an 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 system added with calcium lactate. 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 degradation...

Claims

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Application Information

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