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Metallographic corrosive agent for nickel-based alloy, and using method

A nickel-based alloy and etchant technology, applied in the field of metallographic etchants, can solve problems such as failure of metallographic testing, uneven surface corrosion of samples, environmental pollution, etc. , good corrosion effect

Pending Publication Date: 2020-11-24
CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because of its good corrosion resistance, it is difficult to corrode during metallographic testing. At present, commonly used corrosive agents include aqua regia, nitric acid-hydrochloric acid solution, etc., but the effect of such corrosive agents is general, and the surface of the sample is not uniformly corroded, and some areas are easy to form Excessive corrosion will lead to the failure of metallographic detection. At the same time, corrosive agents such as aqua regia contain volatile strong acids. Improper use and storage may cause personal injury and environmental pollution.

Method used

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  • Metallographic corrosive agent for nickel-based alloy, and using method
  • Metallographic corrosive agent for nickel-based alloy, and using method
  • Metallographic corrosive agent for nickel-based alloy, and using method

Examples

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Effect test

Embodiment 1

[0019] Example 1: Metallographic etchant for K213 nickel-based alloy (nickel content about 34% to 38%) and the method of use are as follows:

[0020] Corrosive agent preparation: Weigh 5g of ferric chloride and 3g of copper chloride at room temperature and put them into a dry and clean beaker; pour 100ml of concentrated hydrochloric acid with a volume percentage of 36.5%, and continue stirring with a glass rod; then pour in a volume percentage of 95% % anhydrous ethanol 100ml, continue to stir with a glass rod until the solid powder is completely dissolved; let it stand for at least 5min.

[0021] Sample preparation: Use a cutting machine to cut metallographic samples of K213 nickel-based alloys; use grinding wheels or coarse sandpaper to chamfer each side and edge of the samples; use metallographic water sandpaper of different sizes to grind the samples, The sample was ground successively by 220 mesh, 400 mesh, 800 mesh and 1000 mesh metallographic water sandpaper; the sample...

Embodiment 2

[0023] Example 2: The metallographic etchant for K418 nickel-based alloy (with a nickel content of about 72% to 76%) and the method of use are as follows.

[0024] Corrosive agent preparation: Weigh 5g of ferric chloride and 3g of copper chloride at room temperature and put them into a dry and clean beaker; pour 100ml of concentrated hydrochloric acid with a volume percentage of 36.5%, and continue stirring with a glass rod; then pour in a volume percentage of 95% Add 50ml of absolute ethanol, stir continuously with a glass rod until the solid powder is completely dissolved; let stand for at least 5min.

[0025] Sample preparation: use a cutting machine to cut metallographic samples of K418 nickel-based alloy; use grinding wheels or coarse sandpaper to chamfer each side and edge of the sample; use metallographic water sandpaper of different particle sizes to grind the sample, metallographic The sample was ground successively by 220 mesh, 400 mesh, 800 mesh and 1000 mesh metall...

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Abstract

The invention relates to a metallographic corrosive agent for a nickel-based alloy, and a using method. According to the technical scheme, the corrosive agent is prepared from 5 g of ferric chloride,3 g of copper chloride, 100 ml of 36.5% concentrated hydrochloric acid and (50 to 100) ml of 95% absolute ethyl alcohol in proportion, wherein the content of the absolute ethyl alcohol can be adjustedaccording to the content of nickel. The metallographic corrosive agent has the beneficial effects that the metallographic corrosive agent is easy to prepare and easy to store; the metallographic corrosive agent is a strong acid without particularly strong corrosivity, not prone to causing personal injuries and environmental pollution, safe and environmentally friendly; after the nickel-based superalloy is corroded by the metallographic corrosive agent, the corrosive effect is good, the metallographic structure is obvious, the grain structure is complete, the situation of non-uniform corrosionor over-corrosion is avoided, and grain measurement, metallographic structure analysis, defect analysis and the like are convenient.

Description

technical field [0001] The invention relates to a metallographic etchant and a method thereof, in particular to a metallographic etchant for a nickel-based alloy and a use method thereof. Background technique [0002] Nickel-based alloy is a kind of alloy with nickel as the matrix, which has good high temperature strength, fatigue resistance, oxidation resistance, corrosion resistance, good mechanical properties and processing properties. It has been widely used in petrochemical, automobile, aviation, Aerospace, nuclear industry, military industry and other fields. [0003] Because of its good corrosion resistance, it is difficult to corrode during metallographic testing. At present, commonly used corrosive agents include aqua regia, nitric acid-hydrochloric acid solution, etc., but the effect of such corrosive agents is general, and the surface of the sample is not uniformly corroded, and some areas are easy to form Excessive corrosion will lead to the failure of metallogr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/28G01N1/32
CPCC23F1/28G01N1/32G01N1/286G01N2001/2866
Inventor 马东良刘长沙刘杰王海波纪宝松
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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