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Etching agent for cobalt-chromium alloy and method using etching agent to acquire metallographic structure

A technology of cobalt-chromium alloy and metallographic structure is applied in the field of obtaining metallographic structure, which can solve the problems of difficulty in obtaining the metallographic structure of cobalt-chromium alloy, and achieve the effects of clear and complete grain boundary outline, obvious microstructure and simple operation.

Active Publication Date: 2018-01-30
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of etchant suitable for cobalt chromium alloy metallographic sample preparation, to solve the difficult problem of cobalt chromium alloy metallographic structure acquisition

Method used

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  • Etching agent for cobalt-chromium alloy and method using etching agent to acquire metallographic structure
  • Etching agent for cobalt-chromium alloy and method using etching agent to acquire metallographic structure
  • Etching agent for cobalt-chromium alloy and method using etching agent to acquire metallographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Measure 15ml of nitric acid with a concentration of 65%, add 2 drops of hydrofluoric acid with a concentration of 40%, and mix well to obtain an acidic etchant.

[0034] Weigh 10g of sodium hydroxide and 15g of potassium ferricyanide, add them into 150ml of water, and stir until completely dissolved to obtain an alkaline etchant.

[0035] The cobalt-chromium alloy powder was scanned by laser cladding technology to make a cobalt-chromium alloy sample. The specific preparation process parameters are: laser power 1000W, scanning speed 2mm / s, spot diameter 2mm.

[0036] Carry out wire cutting on the sample, take a section parallel to the scanning direction of the laser beam, and inlay it with crystal glue.

[0037] Use 400 in turn # 、600 # , 800 # 、1000 # , 1600 # , 2000 # , 2500 # 、3000 # Sandpaper was used to polish the mounted cobalt-chromium alloy samples. During the grinding process, the sandpaper of each grain size is ground along the same direction on the s...

Embodiment 2

[0044] Measure 10ml of nitric acid with a concentration of 67%, add 4 drops of hydrofluoric acid with a concentration of 40%, and mix well to obtain an acidic etchant.

[0045] Weigh 10g of sodium hydroxide and 10g of potassium ferricyanide, add them into 150ml of water, and stir until completely dissolved to obtain an alkaline etchant.

[0046] A cobalt-chromium alloy sample was prepared according to the method in Example 1, and the surface was ground and polished.

[0047]Soak the cobalt-chromium alloy sample in an acid etchant for 20 hours, take out the sample, clean the acid residue on the surface with absolute ethanol and dry it.

[0048] Put the sample into an alkaline etchant heated to 90°C, soak at a constant temperature for 30 minutes, take out the sample, clean it with absolute ethanol and dry it.

[0049] Put the sample under a metallographic microscope, take pictures of the cross-section of the sample to obtain the metallographic structure of the sample.

[0050]...

Embodiment 3

[0052] Measure 15ml of nitric acid with a concentration of 68%, add 4 drops of hydrofluoric acid with a concentration of 40%, and mix well to obtain an acid etchant.

[0053] Weigh 10g of sodium hydroxide and 10g of potassium ferricyanide, add them into 100ml of water, stir until completely dissolved, and obtain an alkaline etchant.

[0054] A cobalt-chromium alloy sample was prepared according to the method in Example 1, and the surface was ground and polished.

[0055] Soak the cobalt-chromium alloy sample in an acid etchant for 40 hours, take out the sample, clean the acid residue on the surface with absolute ethanol and dry it.

[0056] Put the sample into an alkaline etchant heated to 90°C, soak at a constant temperature for 30 minutes, take out the sample, clean it with absolute ethanol and dry it.

[0057] Put the sample under a metallographic microscope, take pictures of the cross-section of the sample to obtain the metallographic structure of the sample.

[0058] Th...

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Abstract

The invention relates to an etching agent for cobalt-chromium alloy and a method using the etching agent to acquire a metallographic structure. The etching agent comprises an acid etching agent and analkaline etching agent which are used independently, wherein the acid etching agent is an acid solution mixed by 40wt% hydrofluoric acid and 65-68wt% nitric acid according to the volume ratio of 1:(50-100), and the alkaline etching agent is an aqueous solution dissolved with 5-10wt% potassium ferricyanide and 5-10wt% sodium hydroxide. A cobalt-chromium alloy sample is soaked in the acid etching agent for not less than 5 hours and then soaked in the alkaline etching agent for not less than 0.5 hour, a prepared cobalt-chromium alloy metallographic sample is evident in microstructure and clear and complete in metallographic structure grain boundary contour, the clear cobalt-chromium alloy metallographic structure can be acquired fast, and the accuracy of the observation and analysis of the metallographic structure is increased.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure acquisition, and relates to a method for obtaining a clear metallographic structure of a cobalt-chromium alloy and a cobalt-chromium alloy etchant for obtaining a clear metallographic structure of the cobalt-chromium alloy. Background technique [0002] The main components of cobalt-chromium alloy are Co and Cr. It has small specific gravity, light weight, high melting point, excellent mechanical properties, and no irritation to the body. It is currently widely used in human body implant materials. [0003] Due to the stable chemical properties and strong corrosion resistance of cobalt-chromium alloys, it is difficult for general etchant to etch cobalt-chromium alloys, and the metallographic sample preparation of cobalt-chromium alloys is a difficult point. [0004] There is almost no report on the specific etching method of cobalt-chromium alloy in the existing metallographic sam...

Claims

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Application Information

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IPC IPC(8): G01N1/30G01N1/32C23F1/30C23F1/40
Inventor 王建宏任杰张浩吴晓玉高明香
Owner ZHONGBEI UNIV
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