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Preparation method of corrosion-resistant micro-arc oxidation film layer on surface of high-strength and high-plasticity magnesium-based amorphous alloy composite material

A technology of amorphous alloys and composite materials, applied in the direction of surface reaction electrolytic coating, anodizing, coating, etc., can solve the problems of poor corrosion resistance, high room temperature brittleness and low strength of new magnesium-based amorphous alloys, and achieve high resistance to corrosion. The effects of improved corrosion resistance, fast film formation and good deformability

Inactive Publication Date: 2021-08-27
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of traditional magnesium alloys such as low strength and poor corrosion resistance, and new magnesium-based amorphous alloys are brittle at room temperature. Therefore, it is proposed to use micro-arc oxidation technology to prepare high-strength and high-plastic magnesium-based amorphous alloy composite materials on the surface. A corrosion-resistant film layer is formed, which combines the excellent comprehensive mechanical properties of the composite material and the good corrosion resistance of the film layer.

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  • Preparation method of corrosion-resistant micro-arc oxidation film layer on surface of high-strength and high-plasticity magnesium-based amorphous alloy composite material
  • Preparation method of corrosion-resistant micro-arc oxidation film layer on surface of high-strength and high-plasticity magnesium-based amorphous alloy composite material
  • Preparation method of corrosion-resistant micro-arc oxidation film layer on surface of high-strength and high-plasticity magnesium-based amorphous alloy composite material

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preparation example Construction

[0033] The preparation method of the corrosion-resistant micro-arc oxidation film layer on the surface of the high-strength and high-plasticity magnesium-based amorphous alloy composite material proposed by the present invention comprises the following steps:

[0034] (1) Base material preparation: firstly, the raw material Mg, Zn, Ca, Fe, Si with a purity of at least 99.99wt.% is alloyed into a master alloy ingot by using a vacuum induction melting furnace, and then prepared by a rapid solidification copper mold spray casting process High strength and high plasticity Mg-Zn-Ca-Fe-Si amorphous alloy composite material.

[0035] (2) Pretreatment of the matrix material: first, the Mg-Zn-Ca-Fe-Si amorphous alloy composite material is cut into moderately sized samples with a diamond cutting machine, and then used in turn with 500#, 800#, 1000#, 1500# SiC water abrasive paper is polished step by step to remove burrs and surface oxides, then use ultrasonic waves to degrease and clean...

Embodiment 1

[0041] A method for preparing a corrosion-resistant micro-arc oxidation film layer on the surface of a high-strength and high-plasticity magnesium-based amorphous alloy composite material, comprising the following steps:

[0042] (1) Matrix material preparation: according to Mg 83 Zn 14.7 Ca 2.1 Fe 0.1 Si 0.1 Five high-purity raw materials (purity ≥ 99.99wt.%) of Mg, Zn, Ca, Fe, Si are weighed by the composition of the amorphous alloy composite material; the configured raw materials are put into a graphite crucible for induction melting furnace, before melting Vacuum the furnace to 4×10 -3 Below Pa, then filled with 0.05MPa argon, smelted 4 to 5 times under the protective atmosphere of argon, so that the alloy composition is uniform, and the master alloy ingot is obtained; finally, it is prepared by rapid solidification copper mold spray casting process under the protective atmosphere of argon. A high-strength and high-plastic Mg83Zn14.7Ca2.1Fe0.1Si0.1 amorphous alloy com...

Embodiment 2

[0052] A method for preparing a corrosion-resistant micro-arc oxidation film layer on the surface of a high-strength and high-plasticity magnesium-based amorphous alloy composite material, comprising the following steps:

[0053] (1) Matrix material preparation: according to Mg 79 Zn 17.5 Ca 2.5 Fe 0.5 Si 0.5 Five high-purity raw materials (purity ≥ 99.99wt.%) of Mg, Zn, Ca, Fe, Si are weighed by the composition of the amorphous alloy composite material; the configured raw materials are put into a graphite crucible for induction melting furnace, before melting Vacuum the furnace to 4×10 -3 Below Pa, then filled with 0.05MPa argon, smelted 4 to 5 times under the protective atmosphere of argon, so that the alloy composition is uniform, and the master alloy ingot is obtained; finally, it is prepared by rapid solidification copper mold spray casting process under the protective atmosphere of argon. High strength and high plasticity Mg 79 Zn 17.5 Ca 2.5 Fe 0.5 Si 0.5 Amor...

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Abstract

The invention provides a preparation method of a corrosion-resistant micro-arc oxidation film layer on the surface of a high-strength and high-plasticity magnesium-based amorphous alloy composite material. The preparation method comprises the following steps: taking a prepared Mg-Zn-Ca-Fe-Si amorphous alloy composite material as an anode and a stainless steel electrolytic bath as a cathode; and carrying out micro-arc oxidation surface modification treatment on a sample in the weakly alkaline electrolyte containing silicate by adopting a double-pulse power supply. The obtained micro-arc oxidation film is uniform in thickness and good in bonding performance with a matrix; a test result shows that after micro-arc oxidation treatment, the corrosion resistance of the sample in simulated body fluid is obviously improved, and the corrosion current density of the sample is reduced by three orders of magnitude compared with that of the matrix; and the fracture strength of the sample is 2-3 times that of a crystalline magnesium alloy material of the same system, the sample has good deformability, and the plastic dependent variable is 7%-12% and is equivalent to that of a traditional wrought magnesium alloy ZK60. The method overcomes the defects that a traditional magnesium alloy is low in strength and poor in corrosion resistance, and a novel magnesium-based amorphous alloy is large in room-temperature brittleness and the like, and is suitable for development and batch production of the high-performance biodegradable magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of biomedical degradable magnesium alloy surface treatment, in particular to a method for preparing a corrosion-resistant micro-arc oxidation film layer on the surface of a high-strength and high-plasticity magnesium-based amorphous alloy composite material. Background technique [0002] In recent years, the research on a new generation of medical metal materials with biodegradable properties, mainly represented by magnesium alloys, has developed rapidly and has received special attention. Compared with traditional medical metal materials, magnesium alloys have many advantages, including good biocompatibility and degradability, density and elastic modulus close to human bone, and no inflammatory response. However, the magnesium alloy degrades too fast in the body. When the tissue has not healed, it has lost its inherent mechanical properties and cannot form a good fixation and protection for the damaged tiss...

Claims

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Application Information

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IPC IPC(8): C25D11/30A61L27/30C25D11/02
CPCA61L27/306C25D11/026C25D11/30
Inventor 陈双双邹家华宋佩頔侯龙李维火李昊頔
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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