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Corrosive agent for displaying metallographic structure of cobalt chromium molybdenum alloy and corrosion method

A technology of cobalt-chromium-molybdenum alloy and metallographic structure is applied in the field of metallographic corrosion, which can solve the problems of poor corrosion effect, inability to display metallographic grain boundaries clearly, and long corrosion time, so as to improve the corrosion effect, not easily cause damage, The effect of reducing the corrosion time

Inactive Publication Date: 2020-07-17
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because cobalt-chromium-molybdenum alloy has excellent corrosion resistance, its metallographic structure cannot be revealed by general chemical etchant. The metallographic structure is corroded, but the corrosion time is long, and the corrosion effect is not good, and the metallographic grain boundary cannot be displayed clearly

Method used

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  • Corrosive agent for displaying metallographic structure of cobalt chromium molybdenum alloy and corrosion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] In this embodiment, the formula of the corrosive agent is: 8 g of sodium hydroxide, 8 g of potassium permanganate, and 200 ml of pure water.

[0069] The cobalt-chromium-molybdenum alloy material in this embodiment is a certain brand of powder metallurgy sintered cobalt-chromium-molybdenum alloy, and the weight percentage of each component is Cr: 26%-30%, Mo: 5-7%, C: ≤1% , Co: balance.

[0070] The corrosion method used to reveal the metallographic structure of cobalt-chromium-molybdenum alloys includes the following steps:

[0071] (1) Metallographic production: wire-cut the cobalt-chromium-molybdenum alloy material to make a metallographic sample of 25mm×25mm×6mm. Select acrylic powder to cold-mount metallographic samples; use metallographic water sandpaper of different particle sizes (400 mesh, 800 mesh, 1000 mesh, 1200 mesh, 1500 mesh, 2000 mesh) to carry out water grinding on a metallographic grinder, and use sandpaper of the same mesh number for water grinding. ...

Embodiment 2

[0074] In this embodiment, the formula of the corrosive agent is: 4 g of potassium hydroxide, 7 g of potassium permanganate, and 150 ml of pure water.

[0075] The cobalt-chromium-molybdenum alloy material in this embodiment is a certain brand of powder metallurgy sintered cobalt-chromium-molybdenum alloy, and the weight percentage of each component is Cr: 26%-30%, Mo: 5-7%, C: ≤1% , Co: balance.

[0076] The corrosion method used to reveal the metallographic structure of cobalt-chromium-molybdenum alloys includes the following steps:

[0077] (1) Metallographic production: wire-cut the cobalt-chromium-molybdenum alloy material to make a metallographic sample of 25mm×25mm×6mm. Select acrylic powder to cold-mount metallographic samples; use metallographic water sandpaper of different particle sizes (400 mesh, 800 mesh, 1000 mesh, 1200 mesh, 1500 mesh, 2000 mesh) to carry out water grinding on a metallographic grinder, and use sandpaper of the same mesh number for water grindin...

Embodiment 3

[0080] In this embodiment, the formula of the corrosive agent is: 5 g of sodium hydroxide, 4 g of potassium permanganate, and 100 ml of pure water.

[0081] The cobalt-chromium-molybdenum alloy material in this embodiment is a certain brand of powder metallurgy sintered cobalt-chromium-molybdenum alloy, and the weight percentage of each component is Cr: 26%-30%, Mo: 5-7%, C: ≤1% , Co: balance.

[0082] The corrosion method used to reveal the metallographic structure of cobalt-chromium-molybdenum alloys includes the following steps:

[0083] (1) Metallographic production: wire-cut the cobalt-chromium-molybdenum alloy material to make a metallographic sample of 25mm×25mm×6mm. Select acrylic powder to cold-mount metallographic samples; use metallographic water sandpaper of different particle sizes (400 mesh, 800 mesh, 1000 mesh, 1200 mesh, 1500 mesh, 2000 mesh) to carry out water grinding on a metallographic grinder, and use sandpaper of the same mesh number for water grinding. ...

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Abstract

The invention discloses a corrosive agent for displaying a metallographic structure of a cobalt chromium molybdenum alloy and a corrosion method. The corrosive agent for displaying the metallographicstructure of the cobalt chromium molybdenum alloy contains strong alkali, oxidant and water. According to the corrosive agent, the corrosion time can be effectively reduced, and the corrosion effect is improved, so that the gold phase crystal boundary is clearly displayed.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion, in particular to an etchant and a corrosion method for displaying the metallographic structure of a cobalt-chromium-molybdenum alloy. Background technique [0002] Cobalt-chromium-molybdenum alloy is a kind of cobalt-based alloy. Because of its excellent corrosion resistance and wear resistance, it can be used as the appearance of wearable electronic products to improve the service life and appearance reliability of electronic products. At the same time, because of its good fatigue resistance, high tensile strength, and good processing performance, it is widely used in the production of biomedical materials (such as dental, bone and joint materials, etc.). [0003] Because cobalt-chromium-molybdenum alloy has excellent corrosion resistance, its metallographic structure cannot be revealed by general chemical etchant. The metallographic structure is corroded, but the corrosion tim...

Claims

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Application Information

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IPC IPC(8): C23F1/40G01N1/32C22C19/07
CPCC22C19/07C23F1/40G01N1/32
Inventor 毛桂江毛咏发张允继李文涛
Owner GOERTEK OPTICAL TECH CO LTD
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