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Magnesium alloy micro-arc oxidation electrolyte and micro-arc oxidation method

A micro-arc oxidation and magnesium alloy technology, applied in the direction of anodizing, can solve the problems of natural bone composition gap, unsatisfactory corrosion resistance of oxide film, etc., and achieve the effects of good biological activity, easy control, and easy availability of raw materials

Inactive Publication Date: 2013-06-26
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the use of inorganic phosphates to prepare calcium-phosphorus micro-arc oxidation coatings has the following problems: first, the corrosion resistance of the oxide film is not ideal; difference

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The sample is cast Mg-1.0Ca alloy, the size is 50×50×10mm 3 Cuboid, the specific operation steps are:

[0036] 1. Mechanical pretreatment: use sandblasting or sandpaper grinding to remove burrs, firm oxides, lubricants for extrusion, mold release agents, casting sand, cutting oil and other foreign matter, reduce surface roughness; wash with water;

[0037] 2. Degreasing: wash with a compound solution of 10g / l sodium hydroxide, 15g / l sodium phosphate, and 15g / l sodium carbonate to remove general dirt, lubricants, cutting agents, etc. divide; wash;

[0038]3. Pickling: washing with concentrated hydrofluoric acid and phosphoric acid in a volume ratio of 1:1, wherein the mass percentage concentration of HF in hydrofluoric acid is not less than 40%, and the concentration of H in phosphoric acid is not less than 40%. 3 PO 4 The mass percentage concentration is not less than 85%, to remove the unremoved scale, corrosion products, sintered lubricants, lubricants, steel pa...

Embodiment 2

[0046] Cast Mg-1.0Ca alloy is used.

[0047] The sample is cut into 50×50×10mm by wire 3 For the cuboid, use 180~1000# water sandpaper to grind it from coarse to fine, then wash it in distilled water, and finally scrub it with acetone and dry it in the air, then put it in a desiccator for use.

[0048] The difference from Example 1 is:

[0049] In sodium silicate aqueous solution or nano-Al 2 o 3 Seal holes in the gel, specifically:

[0050] 1) Sealing in sodium silicate aqueous solution: heat in 50g / L sodium silicate aqueous solution at 95°C for 15 minutes, then place in air to cool for 30 minutes.

[0051] 2) In nano Al 2 o 3 Hole sealing in sol: in Al 2 o 3 In the sol, after pulling to form a film, heat at 180°C for half an hour, and then cool in the air.

[0052] The salt spray test is carried out according to ASTMB117 and ASTMB398 standards. The experimental temperature is 35.5±0.5°C, the corrosion medium used is 5% NaCl solution with pH=7, the angle formed betw...

Embodiment 3

[0054] Die-cast Mg-1.0Ca alloy is used.

[0055] The sample is cut into 50×50×10mm by wire 3 For the cuboid, use 180~1000# water sandpaper to grind it from coarse to fine, then wash it in distilled water, and finally scrub it with acetone and dry it in the air, then put it in a desiccator for use.

[0056] The difference from Example 1 is:

[0057] The micro-arc oxidation solution consisted of 6 g / L sodium hydroxide, 15 g / L phytic acid and 15 g / L calcium carbonate. When phytic acid is used in the electrolyte, pay attention to the order of addition. In a beaker or other container, first add phytic acid and some distilled water, then add calcium-containing electrolytes and other electrolytes, and finally add hydroxide to make the solution alkaline and adjust the pH to above 10, so as to avoid the reaction between phytic acid and calcium carbonate , generating CO 2 , to reduce the concentration of phytic acid in the solution.

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PUM

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Abstract

The invention relates to a magnesium alloy micro-arc oxidation electrolyte and a micro-arc oxidation method. The electrolyte comprises phytate (or phytic acid), a calcic electrolyte, and further one or more added electrolytes as follows: carbonate, silicate, boric acid or borate, and aluminate or aluminum hydroxide. The micro-arc oxidation method comprises the following steps of: pre-treatment; micro-arc oxidation; and post-treatment. The micro-arc oxidation electrolyte provided by the invention does not contain Cr<6+>, F<-> and PO4<3->, and even if strong base used is less, so that the environment is not polluted. The film obtained by the micro-arc oxidation method is smooth in surface, good in corrosion resistance and better in antibacterial performance and biological activity. According to the method, raw materials are easily available, and the method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a magnesium alloy surface treatment technology, in particular to a process for preparing a calcium-phosphorus bioactive coating by micro-arc oxidation on the surface of a medical magnesium alloy. Background technique [0002] With the development of science and technology, the aging of the population, and the increase in trauma caused by industry, transportation, and sports, people's demand for biomedical materials and their products is increasing. At present, most of the fracture internal fixation devices widely used clinically are made of stainless steel and titanium alloy. Compared with the above metal materials, magnesium alloy has the following advantages: (1) Other metal biomaterials may release toxic ions or particles after being corroded or worn in body fluids; while magnesium is one of the essential macroelements for the human body, it participates in A series of metabolic processes, accelerating bone healing, etc. (...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 张荣发张淑芳刘志凌
Owner JIANGXI SCI & TECH NORMAL UNIV
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