Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Corroding method for metallographic specimen of high nickel-chromium alloy

A metallographic sample, high-nickel-chromium technology, applied in the field of metallographic corrosion of metal materials, can solve problems such as the inability to prevent alloy surface passivation, difficulty in controlling the degree of corrosion, etc., to achieve the elimination of surface passivation and the degree of corrosion Controllable and easy-to-operate effects

Inactive Publication Date: 2015-04-08
JINCHUAN GROUP LIMITED
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a method for corroding metallographic samples of high-nickel-chromium alloys, which solves the problem that the alloy surface cannot be prevented from being passivated and the degree of corrosion is difficult to control during corrosion by ordinary chemical methods

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Corroding method for metallographic specimen of high nickel-chromium alloy
  • Corroding method for metallographic specimen of high nickel-chromium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Sample 1:

[0019] Alloy grade: Cr20Ni80;

[0020] Composition (weight ratio): Cr: 20%, Ni: 80%;

[0021] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0022] Etching time: 1.5 minutes;

[0023] The metallographic photo of sample 1 after corrosion treatment is as follows: figure 2 shown.

Embodiment 2

[0025] Sample 2:

[0026] Alloy grade: Cr15Ni60;

[0027] Composition (weight ratio): Cr: 15%, Ni: 60%, Fe: 25%;

[0028] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0029] Etching time: 1 minute.

Embodiment 3

[0031] Sample 3:

[0032] Alloy grade: Cr30Ni70;

[0033] Composition (weight ratio): Cr: 30%, Ni: 70%;

[0034] Corrosive solution: hydrochloric acid + nitric acid + water, the volume ratio is 10:15:75;

[0035] Etching time: 3 minutes.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a corroding method for a metallographic specimen of a high nickel-chromium alloy. The method comprises the following steps: soaking a pretreated metallographic specimen in a corrosive liquid with a corrosive face facing downward; and slowly lifting up the specimen above the liquid level of the corrosive liquid, wherein the peak of a corrosive drop on the corrosive face is contacted with the liquid level of the corrosive liquid. The display method of the metallographic structure of the alloy specimen provided by the invention is suitable for high nickel-chromium alloy which is hard to corrode by conventional methods. By selecting a proper corrosive liquid, the high nickel-chromium alloy specimen is corroded by virtue of the method disclosed by the invention, so that surface passivation of the corrosive face of the specimen can be eliminated. The corrosive degree can be controlled, the metallographic structure is clearly displayed and the operating method is simple and convenient.

Description

technical field [0001] The invention relates to the field of metallographic corrosion of metal materials, in particular to a method for corroding metallographic samples of high-nickel-chromium alloys. Background technique [0002] Among the display methods of various metallographic sample structures, the most commonly used method is chemical etching. Chemical etching is the process of chemical dissolution or electrochemical dissolution of the sample surface. Pure chemical dissolution is less, and the corrosion of pure metals and homogeneous single-phase alloys is usually regarded as a chemical dissolution process, and the corrosion of two-phase or multi-phase alloys is regarded as an electrochemical dissolution process. [0003] The microstructure of pure metals and single-phase alloys is composed of many grains. When the polished sample is contacted with the etching reagent, the residual deformation disturbance layer on the polished surface is dissolved first, and then th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32C23F1/28
Inventor 陈兴纲王玉山昝斌柏先林
Owner JINCHUAN GROUP LIMITED
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com