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topic 10759

Marbles Reagent Procedure


 

Q. I would like to know if there is a procedure for etching steel with a marbles reagent. We have the formula but we do not know if the parts are dipped (and if so for how long) or if you apply current (forward or reverse).

David Crocker
- Valencia, California


10759 marbles reagent
Courtesy of Pace Technologies (http://www.metallographic.com/Etchants/Etchants.htm)


 

A. Hello David!

We swab our metallographically prepared stainless steel mounts with Marble's etch, using the guidelines found in ASTM E3 [link by ed. to spec at TechStreet] on Preparation of Metallographic Specimens, and ASTM E407 [link by ed. to spec at TechStreet], Microetching Metals and Alloys. We don't use electrolytic enhancement.

Good luck!

lee gearhart
Lee Gearhart
metallurgist



October 7, 2009

A. We typically cotton swab our stainless steels for 10 - 20 seconds with marbles reagent. We use your typical swab but with additional cotton added from a cotton ball to make it larger. We thoroughly soak the swab and try to cover the entire surface as quickly as possible. We observe the reaction and continue swabbing as required. When the etch appears to be satisfactory we immediately rinse with distilled water. You can also immersion etch but this makes it more difficult to observe the process.

Hope this helps further.

Craig

Craig Sandusky
- Greenwood, Indiana



Etching Monel using Marbles reagent

August 20, 2013

Q. How long we should etch Monel(NiCu7) with Marbles reagent for revealing its microstructure?

VIPIN V PAVANAN
Research project - VELLORE, TAMILNADU, INDIA



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