Page 44 - Corrosion Engineering Principles and Practice

Comments Most common etchant used. Reveals ferrite grain boundaries, pearlite, martensite, and bainite. Not as good as picral for high-resolution work with low-temperature transformation products. As above but more sensitive to carbide than other features. Good for revealing carbides in cold rolled and annealed s

Etchant Nital 3% or 5% Picral Brauners reagent Fry’s reagent SASPA LePera’s reagent Aqua regia Glycer regia Acid ferric chloride Vilella’s reagent Kalling’s reagent Acid ferric chloride Acid ferric chloride (10 g ferric chloride, 30 mL HCl, 120 mL water) Aqua regia (3 parts HCl plus 1 part ni

Uses Iron & steel Iron & steel Iron & steel Iron & steel Iron & steel Iron & steel Stainless steels Stainless steels Stainless steels Stainless steels Stainless steels Copper alloys TABLE 2.3

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