etchant
etchant
(OP)
Hi All ,
Would anyone happen to know the best etchant to use on cmsx4 supralloy for optical microscopy, i seem to be getting a slight over etch and pooling around the
edge of the sample using general nimomic etchant?
Would anyone happen to know the best etchant to use on cmsx4 supralloy for optical microscopy, i seem to be getting a slight over etch and pooling around the
edge of the sample using general nimomic etchant?





RE: etchant
Standard etchant for nickel-based superalloys is glyceregia: 15 mL HCl, 10 mL glycerol, 5 mL HNO3. Swab specimen for 5-60 seconds. Mix fresh. Do not store. Use under a hood. Modified glyceregia is 60 mL glycerol, 50 mL HCl, 10 mL HNO3. This version reveals precipitates better. Use under hood; do not store. Add HNO3 last. Discard when dark yellow. Immerse or swab specimen 10-60 seconds.