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Metallographic chemical polishing solution and application thereof to field of austenitic stainless steel metallographic detection

A technology of austenitic stainless steel and chemical polishing, applied in the preparation of test samples, etc., can solve problems such as inability to chemical polishing, and achieve the effect of easy control of polishing speed, good polishing effect, and not easy to deteriorate.

Pending Publication Date: 2020-11-03
SHANDONG ELECTRIC POWER IND BOILER & PRESSURE VESSEL INSPECTION CENT CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some shortcomings in the traditional chemical polishing method applied to austenitic stainless steel: due to the high content of alloying elements such as Cr and Ni in austenitic stainless steel (the sum of the mass fractions is often close to 30%), the traditional metallographic chemical polishing solution often It cannot be chemically polished due to factors such as insufficient acidity

Method used

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  • Metallographic chemical polishing solution and application thereof to field of austenitic stainless steel metallographic detection
  • Metallographic chemical polishing solution and application thereof to field of austenitic stainless steel metallographic detection

Examples

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Embodiment 1

[0059] In the present embodiment, a kind of metallographic chemical polishing liquid and preparation method are provided, each component and proportioning ratio are as follows in the described metallographic chemical polishing liquid: hydrochloric acid 130ml / L, phosphoric acid 160ml / L, sodium nitrate 50g / L, 30% Hydrogen peroxide 280ml / L, absolute ethanol 110ml / L, thiourea 6g / L, hydrochloric acid fog suppressant 0.8g / L, and distilled water as the balance.

[0060] Wherein, the hydrochloric acid is 130ml / L and the configuration method is as follows: 130ml of concentrated hydrochloric acid with a mass fraction of 36-38% is added to each L of metallographic chemical polishing solution.

[0061] The 160ml / L of phosphoric acid is configured as follows: 160ml of concentrated phosphoric acid with a mass fraction ≥ 85% is added to each L of metallographic chemical polishing solution.

[0062] The configuration of 280ml / L of 30% hydrogen peroxide is as follows: 280ml of hydrogen peroxid...

Embodiment 2

[0070] In the present embodiment, another kind of metallographic chemical polishing liquid is provided, and each raw material and proportioning ratio in the metallographic chemical polishing liquid are as follows: hydrochloric acid 130ml / L, phosphoric acid 160ml / L, sodium nitrate 50g / L, 30% peroxide Hydrogen 280ml / L, absolute ethanol 110ml / L, thiourea 6g / L, hydrochloric acid fog suppressant 0.8g / L, and distilled water as the balance.

[0071] The hydrochloric acid fog suppressant is Yuantai YT-1101 type.

[0072] The configuration method of the metallographic chemical polishing solution is the same as that described in Example 1.

Embodiment 3

[0074] In the present embodiment, another kind of metallographic chemical polishing liquid is provided, and each raw material and proportioning ratio in the metallographic chemical polishing liquid are as follows: hydrochloric acid 150ml / L, phosphoric acid 120ml / L, sodium nitrate 70g / L, 30% peroxide Hydrogen 310ml / L, absolute ethanol 80ml / L, thiourea 4g / L, hydrochloric acid fog suppressant 1.2g / L, and distilled water as the balance.

[0075] The hydrochloric acid fog suppressant is Yuantai YT-1101 type.

[0076] The configuration method of the metallographic chemical polishing solution is the same as that described in Example 1.

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Abstract

The invention particularly relates to a metallographic chemical polishing solution and application thereof in the field of austenitic stainless steel metallographic detection. A traditional chemical polishing solution is applied to austenitic stainless steel surface detection and cannot achieve the ideal polishing effect easily, and the chemical polishing solution suitable for 18Cr-8Ni type austenitic stainless steel metallographic detection is provided and comprises ingredients including, 120 ml / L-160 ml / L of hydrochloric acid, 120 ml / L-160 ml / L of phosphoric acid, 50 g / L-70 g / L of sodium nitrate, 300 ml / L of 30% hydrogen peroxide, 100 ml / L of ethyl alcohol, 5 g / L of thiourea, 1 g / L of hydrochloric acid fog inhibitor and the balance water. When the chemical polishing solution is applied to austenitic stainless steel, acid mist generated in the polishing process can be effectively inhibited, the preparation method is simple, convenient and high in safety, and a clear metallographic structure surface can be obtained.

Description

technical field [0001] The invention belongs to the technical field of metallographic detection and polishing, and in particular relates to a metallographic chemical polishing liquid, a preparation method of the polishing liquid and the application of the metallographic chemical polishing liquid in the field of metallographic detection of 18Cr-8Ni austenitic stainless steel . Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, with the rapid development of power plant boilers in the direction of high parameters, large capacity, and high efficiency, higher requirements have been placed on the performance and processing performance of materials for heating part...

Claims

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Application Information

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IPC IPC(8): C23F3/06G01N1/32
CPCC23F3/06G01N1/32
Inventor 张鸿武杨东旭冯楠楠岳增武邵明星马永泉高明德李晓宇邓化凌张广成刘爽
Owner SHANDONG ELECTRIC POWER IND BOILER & PRESSURE VESSEL INSPECTION CENT CO LTD
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