Metallographic corroding agent and preparation method and application thereof

A kind of etchant, liquid phase technology, applied in the field of metallographic etchant and preparation, to achieve the effect of easy to use, simple preparation, wide application range

Active Publication Date: 2020-11-20
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the existing metallographic etchant in the metallographic corrosion of the aluminide coating on the surface of austenitic steel, provide a kind of metallographic etchant and its preparation method and application, specifically solve the metallographic structure of austenitic steel and Simultaneous visualization of the microstructure of the aluminide coating on its surface; the formula of the metallographic etchant is simple, and the operation is very easy to use. The metallographic imaging effect of the coating structure is remarkable, the structure of the substrate and the coating is clear, and the interface is obvious

Method used

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  • Metallographic corroding agent and preparation method and application thereof
  • Metallographic corroding agent and preparation method and application thereof
  • Metallographic corroding agent and preparation method and application thereof

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preparation example Construction

[0032] The preparation method of the above-mentioned metallographic etchant is as follows: first, measure 40-55% hydrochloric acid, 37-48% ultrapure water and 8-12% glycerol according to the volume percentage, and add The ratio of 7-16g of copper sulfate and 2-6g of ferric chloride was weighed to measure the corresponding proportions of copper sulfate and ferric chloride; then slowly add concentrated hydrochloric acid and glycerin into ultrapure water and keep stirring , until the liquid phase is mixed evenly; finally, the copper sulfate and ferric chloride weighed in proportion are gradually added to the above liquid phase until they are completely dissolved to obtain a metallographic etchant.

[0033]The further improvement of the present invention is: aiming at the aluminide coating on the surface of the austenitic steel in the original state (serving for 0 hours), it is composed of the following volume and mass components: 55mL of concentrated hydrochloric acid, 37mL of ult...

Embodiment 6

[0052] Step 1: Preparation of corrosion samples

[0053] The original austenitic steel aluminide coating sample was hot-mounted along the coating cross-section direction and marked on the sample with an electric engraving pen; #, 1200#, 2000# Water-grinding metallographic sandpaper is ground step by step; finally, the sample is polished on a polishing machine with a polishing cloth or flannelette until the surface reaches a mirror-level brightness, and there are no coarse scratches visible to the naked eye. The powder is conductive mounting powder, the polishing paste is 1.5 μm diamond spray polishing agent, and the grinding and polishing directions are perpendicular to the coating direction.

[0054] Step 2: Preparation of metallographic etchant

[0055] According to volume percentage, mix 44% concentrated hydrochloric acid, 46% ultrapure water and 10% glycerol uniformly to obtain a liquid phase, add copper sulfate and ferric chloride to the liquid phase, and mix uniformly t...

Embodiment 7

[0059] Step 1: Preparation of corrosion samples

[0060] The original austenitic steel aluminide coating sample was hot-mounted along the coating cross-section direction and marked on the sample with an electric engraving pen; #, 1200#, 2000# Water-grinding metallographic sandpaper is ground step by step; finally, the sample is polished on a polishing machine with a polishing cloth or flannelette until the surface reaches a mirror-level brightness, and there are no coarse scratches visible to the naked eye. The powder is conductive mounting powder, the polishing paste is 1.5 μm diamond spray polishing agent, and the grinding and polishing directions are perpendicular to the coating direction.

[0061] Step 2: Preparation of metallographic etchant

[0062] According to volume percentage, mix 52% concentrated hydrochloric acid, 37% ultrapure water and 11% glycerol uniformly to obtain a liquid phase, add copper sulfate and ferric chloride to the liquid phase, and mix uniformly t...

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Abstract

The invention discloses a metallographic corroding agent and a preparation method and application thereof. The metallographic corroding agent comprises a liquid phase, copper sulfate and ferric trichloride, wherein the liquid phase comprises, by volume, 40-55% of hydrochloric acid, 37-48% of water and 8-12% of glycerol in percentage. The metallographic corroding agent can simultaneously display the structures of the austenitic stainless steel and an aluminide coating on the surface of the austenitic stainless steel through simple chemical corrosion treatment, and has a remarkable effect of simultaneously displaying the structures of a matrix and the coating under the original state and the service state.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection of metal materials, and in particular relates to a metallographic etchant and its preparation method and application. Background technique [0002] Austenitic stainless steel is widely used in the selection of high-temperature components of boilers for ultra-supercritical (USC) thermal power units in service and advanced ultra-supercritical (A-USC) units in the near future due to their excellent high-temperature mechanical properties and competitive cost. among. With the continuous improvement of steam parameters of thermal power units, the problem of high-temperature oxidation on the steam side of austenitic steel boiler tubes has gradually become prominent, and the resulting oxide scales have fallen off, leading to tube burst accidents. The surface preparation of aluminide coating is one of the protection technologies that are cost-effective and simple in preparation process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/28G01N1/32
CPCC23F1/28G01N1/32
Inventor 黄锦阳鲁金涛张醒兴杨珍周永莉严靖博党莹樱尹宏飞袁勇谷月峰
Owner XIAN THERMAL POWER RES INST CO LTD
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