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RNO etchant - For revealing secondary carbides in steel

Material Name: High chromium cast iron
Recipe No.: 12063
Primary Chemical Element in Material: Fe
Sample Type: Bulk
Uses: For revealing secondary carbides in steel.
Etchant Name: RNO
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 800 ml H2O, 100 ml HNO3, 10 ml HCl, 1.2 g picric acid
Procedure (Condition): Etching time: 5-50 s.
Note: HCCI-16 steel:
Reference: M.A.Guitar, et al., Evaluatiob of the Etching Process for Analysis of Secondary Carbides in HCCI by Optical and Confocal Laser Microscopy, Pract.Metallography, 56 (2019) 4, pp. 246-261.