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A method for preparing a nickel-platinum alloy metallographic sample and displaying the sample structure

A technology for sample preparation and nickel-platinum alloy, which is applied in the preparation of test samples and other directions, can solve the problems of corrosion metallographic structure of nickel-platinum alloy, and achieve the effects of easy preparation, convenient use and simple operation.

Active Publication Date: 2016-03-23
GRIKIN ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ideal metallographic structure cannot be fully corroded for nickel-platinum alloys.
Due to the high toxicity or strong corrosiveness of some reagents, the purchase and storage are subject to control restrictions

Method used

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  • A method for preparing a nickel-platinum alloy metallographic sample and displaying the sample structure
  • A method for preparing a nickel-platinum alloy metallographic sample and displaying the sample structure
  • A method for preparing a nickel-platinum alloy metallographic sample and displaying the sample structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Two pieces of NiPt alloy samples 1# and 2#, with water as lubricant, were coarsely ground by P180, P400, P800, P1200 sandpaper respectively. The speed of the grinding and polishing machine was 320 rpm. It is 90° to the direction of the previous sandpaper grinding and polishing, and when observed under a microscope, there is no scratch on the surface. Then finely grind with P2400 sandpaper, the speed of the grinding and polishing machine is 240 rpm, firstly grind off the scratches of the coarse grinding along the direction perpendicular to the scratches of the coarse grinding, then turn 90°, grind it again, and rinse with water; then Carry out mechanical polishing with abrasive paste with a particle size of 1.0, the speed of the polishing machine is 320 rpm, and wash with water. Observed under a microscope, there was no scratch on the surface of the sample, and the 1# sample was directly corroded with aqua regia for 30s, then rinsed with water, dehydrated with absolute e...

Embodiment 2

[0026] Two pieces of NiPt alloy samples 3# and 4#, with water as lubricant, were coarsely ground by P180, P400, P800, P1200 sandpaper respectively. The speed of the grinding and polishing machine was 320 rpm. It is 90° to the direction of the previous sandpaper grinding and polishing, and there is no scratch on the surface. Then finely grind with P2400 sandpaper, the speed of the grinding and polishing machine is 320 rpm, firstly grind off the rough grinding scratches along the direction perpendicular to the rough grinding scratches, then turn 90°, grind again, and confirm the surface by microscope observation No scratches, rinse off with water. Then use a grinding paste with a particle size of 1 for mechanical polishing, the speed of the grinding and polishing machine is 240 rpm, rinse with water, and observe under a microscope to confirm that there are no scratches on the surface of the sample. 3# Electropolish with electrolytic polishing solution, and then rinse with water...

Embodiment 3

[0029] Two pieces of NiPt alloy samples 5# and 6#, with water as lubricant, were coarsely ground by grinding and polishing with P180, P400, P800, P1200 sandpaper respectively. The speed of the grinding and polishing machine was 240 rpm. It is 90° to the direction of the previous sandpaper grinding and polishing, rinse with water, and confirm that there is no scratch on the surface. Then finely grind with P2400 sandpaper. The speed of the grinding and polishing machine is 280 rpm. First, the scratches of the coarse grinding are removed along the direction perpendicular to the scratches of the rough grinding, then rotated 90°, and grind again. The microscope observation confirms that the surface is free of scratches. Scratches, rinse with water. Then use abrasive paste with a particle size of 1 for mechanical polishing. The speed of the grinding and polishing machine is 320 rpm, rinse with water, and observe under a microscope to confirm that there is no scratch on the surface o...

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Abstract

The invention discloses a method for preparing a nickel-platinum alloy metallographic phase sample and displaying a sample tissue, belonging to the technical field of metallographic phase sample preparation. The method specifically comprises the steps of coarse grinding, accurate grinding, mechanical polishing, electrolytic polishing and corroding and is characterized in that the electrolytic polishing solution in the step of electrolytic polishing comprises 1.5-5% by volume of HCl, 10-18% of HClO3 and the balance of absolute ethyl alcohol; the electrolysis parameters are as follows: the current density is 2.0-3.0A, the voltage is 20-30V and the electrolysis time is 30-60s; the corrosive solution in the step of corroding comprises 5-25% by volume of HCl, 30-60% of HNO3 and the balance of water; the corrosion time is 30-90s. The method has the beneficial effects that the stress layer can be effectively removed, phase films are not generated, the real surface is obtained and the real nickel-platinum metallographic phase can be clearly displayed; the method is simple, reliable, economical and efficient and is suitable for preparing and displaying the nickel-platinum alloy metallographic phase.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, and in particular relates to a method for preparing a nickel-platinum alloy metallographic sample and displaying the sample structure. Background technique [0002] Nickel-based alloys have better corrosion resistance, especially containing platinum, so nickel-platinum alloys are difficult to electrolyze and corrode. Electrolyte corrosion solutions using conventional nickel alloys cannot show microstructure, and because platinum is a noble metal, poor electrolysis or corrosion requires re-grinding, electrolysis, and corrosion, which will lead to waste of precious metals. At the same time, due to the method of mechanical grinding and polishing, a plastic deformation layer will be formed on the surface of the sample. The existence of this deformation layer will affect the correct display of the tissue, produce false images, and cause the observer to misjudge. The method f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 朱晓光孙秀霖何金江刘红宾罗俊锋范亮李勇军王兴权
Owner GRIKIN ADVANCED MATERIALS