Cast irons-Chemical etching

Material: Cast irons
Type: Micro
Method: Chemical etching
Etchant (Electrolyte): 100 ccm H2O, 1 g Na2MoO4 x 2 H2O. Acidified with HNO3 to ph 2.5-3.
Procedure: Etching time is 45-60 s.
Note: Phosphide and cementite:yellow-orange, ferrite:white.
Source: Practical Metallography, Vol. 11, No. 5, 1974, p.272.
















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