If so will it just attack or completely leach away them from surface.
I have used glyceregia for 5-10 second and it left impressions of gamma prime .
I think HCl plus H202 would be better than Glyceretia. One is reducing and the other is oxidising. You would get the contour revealed.
We use HCl+H2O2 as macroetch for grainsize measurement of cast alloys e.g. 713LC. Dendritic microstructure is revealed. Etched surface is wavy, not good for gamma prime observation. For this purpose we use electrolytic etch in oxalic acid. However, other possibilities are available. Maybe short intervals of etching in HCl+H2O2 may work as well.
I do not have experience with IN617, is it a wrought alloy? I suggest to use air ventilation (fume hood) when etching by HCl and H2O2 mixture, fresh solution is needed.
HCl+H2O2 is OK， but you must polishing very very good, and etched the sample with more liquid under enough HCl+H2O2, otherwise the Cl2 gas will contribute to black surface (samples must recated under very high liquid bottle eg. glass follower vase)
- Badges
- Science topic
- Similar topics
- Engineering
- Materials Engineering
- Powders