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

Stainless steel metallographic corrosion agent and application method thereof

An application method, stainless steel technology, applied in the preparation of test samples, measuring devices, material analysis through optical means, etc., can solve the problem of over-corrosion of powder metallurgy stainless steel, and achieve a smooth and slow corrosion process

Active Publication Date: 2019-04-16
HANS LASER TECH IND GRP CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a stainless steel metallographic etchant for the above-mentioned defects of the prior art, which overcomes the defect that the surface of the powder metallurgy stainless steel has been over-corroded when the existing etchant corrodes the phase boundary of the deformed stainless steel

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
  • Stainless steel metallographic corrosion agent and application method thereof
  • Stainless steel metallographic corrosion agent and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] Furthermore, the embodiment of the present invention also provides a method for preparing the metallographic etchant for stainless steel as described above, which is characterized in that it specifically includes the following steps:

[0033] (1) Add concentrated nitric acid solution into absolute ethanol solution to obtain nitric acid alcohol solution;

[0034] At room temperature, slowly add the concentrated nitric acid solution to the absolute ethanol solution from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the cross section of the solder joint. When the surface of the stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution.

[0035] (2) Add ferric chloride solution to nitric acid alcohol solution to obtain metall...

Embodiment 1

[0048] Slowly add concentrated nitric acid solution with a concentration of 65% to the absolute ethanol solution with a concentration of 99.75% from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the solder joint horizontally When the surface of the powder metallurgy stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution. Wherein, the volume fraction of the concentrated nitric acid solution in the nitric alcohol solution is 14.6%, and the volume fraction of the absolute ethanol solution is 85.4%.

[0049]The ferric chloride solution with a mass fraction of 40% is also slowly added to the above-mentioned nitric acid alcohol solution from less to more. , until the phase boundary of the deformed stainless steel and the grain boun...

Embodiment 2

[0051] Slowly add concentrated nitric acid solution with a concentration of 68% to the absolute ethanol solution with a concentration of 99.8% from less to more, and at the same time use a cotton swab to dip the nitric acid alcohol solution composed of concentrated nitric acid solution and absolute ethanol solution to wipe the solder joint horizontally When the surface of the powder metallurgy stainless steel can slightly show some of its grain boundaries, stop adding the concentrated nitric acid solution to complete the configuration of the nitric acid alcohol solution. Wherein, the volume fraction of the concentrated nitric acid solution in the nitric alcohol solution is 33.3%, and the volume fraction of the absolute ethanol solution is 66.7%.

[0052] The ferric chloride solution with a mass fraction of 58% is also slowly added to the above-mentioned nitric acid alcohol solution from less to more. , until the phase boundary of the deformed stainless steel and the grain boun...

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 relates to the technical field of metallographic corrosion of stainless steel materials, and particularly relates to a stainless steel metallographic corrosion agent and an application method thereof. The metallographic corrosion agent comprises the following components: by volume ratio, 12-25% of concentrated nitric acid solution, 47-70% of anhydrous ethanol solution, and 16-30% offerric chloride solution, and the mass fraction of iron chloride in ferric chloride solution is 40-58%. Through the mutual synergy between different solution, the phase boundary of deformed stainlesssteel and the grain boundary of powder metallurgy stainless steel can be displayed quickly and obviously, compared with existing dilute aqua regia or ferric chloride corrosion agent, the corrosion process of the stainless steel metallographic corrosion agent is steady and slow, the grain boundary of powder metallurgy stainless steel cannot be corroded during corroding of the phase boundary of thedeformed stainless steel, and great convenience is provided for the follow-up inspection of the welding quality.

Description

technical field [0001] The invention relates to the technical field of metallographic corrosion of stainless steel materials, in particular to a stainless steel metallographic corrosion agent and an application method thereof. Background technique [0002] Ordinary deformed stainless steel refers to stainless steel processed by rolling (hot rolling, cold rolling), stamping, etc. It has high strength, good toughness, excellent corrosion resistance and weldability, and is widely used in the industry. Powder metallurgy stainless steel is stainless steel manufactured by powder metallurgy method (injection molding). The grades of these two stainless steels are the same, but due to their different manufacturing processes, there are also differences in properties. [0003] The stainless steel laser welding process has many advantages such as high strength after welding, small heat-affected zone, beautiful solder joints, high efficiency and easy automation. It has been rapidly deve...

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
IPC IPC(8): C23F1/28G01N21/84G01N1/32
CPCC23F1/28G01N1/32G01N21/84
Inventor 苟军夏丰滨肖华李剑锋王瑾高云峰
Owner HANS LASER TECH IND GRP CO LTD
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