Corrosive agent and corrosion method for dendritic tissue of CoCrMo alloy used in artificial joint

A technology of dendritic structure and artificial joint is applied in the field of metallographic structure characterization of metal materials, which can solve the problem of inability to display dendritic structure, and achieve the effect of simple composition, good reproducibility and clear structure.

Inactive Publication Date: 2019-02-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The CoCrMo alloy is based on Co, the Co content is as high as 65%, and the Cr content is as high as 29%. It has better corrosion resistance than ste...

Method used

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  • Corrosive agent and corrosion method for dendritic tissue of CoCrMo alloy used in artificial joint
  • Corrosive agent and corrosion method for dendritic tissue of CoCrMo alloy used in artificial joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Specimen Preparation

[0030] Select a CoCrMo alloy artificial joint in the as-cast state, and cut a metallographic sample of Ф15*12mm. The sample is mechanically polished and polished according to the metallographic sample preparation method. The sample is first mechanically polished by 120#, 200#, 400#, 600#, 800#, 1000#, 1200# water-grinding sandpaper; Carry out mechanical polishing for 3.5μm and 1.5μm polishing paste, polish until the surface is free of scratches, rinse with water, then clean with alcohol and dry, pay attention to the corrosion surface without water stains.

[0031] 2. Corrosive preparation

[0032] First, use a measuring cylinder to measure 30ml of potassium permanganate solution with a concentration of 8%, and pour it into a beaker; then measure 30ml of a sodium hydroxide solution with a concentration of 20%, and pour it into a beaker with potassium permanganate solution. Stir with a glass rod to mix the solution thoroughly.

[0033] 3. Corr...

Embodiment 2

[0036] 1. Specimen Preparation

[0037] Select a CoCrMo alloy artificial joint in the heat treatment state, and cut a metallographic sample of Ф15*10mm. The sample is mechanically polished and polished according to the metallographic sample preparation method. The sample is first mechanically polished by 120#, 200#, 400#, 600#, 800#, 1000#, 1200# water-grinding sandpaper; Carry out mechanical polishing for 3.5μm and 1.5μm polishing paste, polish until the surface is free of scratches, rinse with water, then clean with alcohol and dry, pay attention to the corrosion surface without water stains.

[0038] 2. Corrosive preparation

[0039] First, use a measuring cylinder to measure 25ml of potassium permanganate solution with a concentration of 8%, and pour it into a beaker; then measure 25ml of a sodium hydroxide solution with a concentration of 20%, and pour it into a beaker with potassium permanganate solution. Mix the solution thoroughly with a glass rod.

[0040] 3. Corro...

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Abstract

The invention belongs to the field of metallographic tissue characterization of metallic materials, and relates to a corrosive agent and a corrosion method for dendritic tissue of CoCrMo alloy used inartificial joint. The corrosion solution used in the invention is an evenly mixture of equivalent potassium permanganate and sodium hydroxide solution. When the corrosive agent is heated to boiling,the specimen after mechanically polishing is immersed in the corrosion solution in boiling state to corrode the dendrite tissue. Because of the different corrosion resistance of cast specimen and heat-treated specimen, the corrosion time of the specimen in different states is stipulated in the present invention. The corrosive agent of the invention has simple composition, only consisting of potassium permanganate and sodium hydroxide. The preparation ratio is 1:1, and the preparation process is simple. The CoCrMo alloy dendritic tissue corroded by this method is clear and accurate, and the dendrite area of the solid-soluble reinforcing element is corroded.

Description

technical field [0001] The invention belongs to the field of metallographic structure characterization of metal materials, and relates to a CoCrMo alloy dendrite structure corrosive agent and a corrosion method for artificial joints. Background technique [0002] Due to its good biocompatibility and strength, CoCrMo alloy has become an ideal main material for artificial joints in clinical practice, and is widely used in surgical implants such as metal hip joints. This alloy frequently appears in engineering applications. The phenomenon that castings are scrapped due to unqualified tensile properties at room temperature. Since the microstructure in the alloy determines the mechanical properties, and the casting process can affect the microstructure to a certain extent, the study of the relationship between the microstructure, mechanical properties and casting process is very important for optimizing the casting process, stabilizing Mechanical properties are of great signific...

Claims

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Application Information

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IPC IPC(8): G01N33/204G01N17/00
CPCG01N17/006G01N33/20
Inventor 马秀萍孟宇张华霞周同金刘东方
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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