Dear Researches; I'm looking for an etchant to characterize the microstructure of SS316 welded to Inconel 718. I only need to etch SS316 and I don't want to etch Inconel 718. Do you have any suggestion? Best regards.
Good day! Hope that following links will help you to push research further:
https://asianjournalofchemistry.co.in/User/ViewFreeArticle.aspx?ArticleID=23_7_2
https://www.researchgate.net/post/What_is_a_good_etchant_for_316_stainless_steel
https://www.metallographic.com/Metallographic-Etchants/Metallography-Stainless-steel-etchants.htm
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwjH-ODO0t35AhVa6CoKHQg0DikQFnoECEMQAQ&url=https%3A%2F%2Fsmartech.gatech.edu%2Fbitstream%2Fhandle%2F1853%2F59756%2FCHOI-DISSERTATION-2017.pdf&usg=AOvVaw228qFoFBFmhdCOJt594WO8
Dear Dr. Milad Karimi ,
you could shield the part you do not want to attack with some resin / coating (resistant to acids and possibly removable) and carry out the chemical attack on the part that interests you.
My best regards, Pierluigi Traverso.
P.S .: a varnish could also work trivially, like the one for the nails ...
Swabbing Marble's reagent could be a first go for the 316. Simple tape to cover the part you don't want etched will work, such as Scotch tape. If you want more detail of the weld section though, you would probably have to etch both, in which case an electrolytic etch might be your best bet.
Cheers.
Hi! hope you are doing well. See any reagent etchant which attacks Stainless steel will definitely affect the Inconel 718 too. I generally prefer aqua regia solution for etching both of them. In your case, you can use the preferential etching technique to prefer the 718 during etching. In this technique, you should use the cotton swab and carefully apply the etchant over 316 only, mind the interface between the two.
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