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Metallographic Hastelloy Etchants

Etching Hastelloy is difficult due to the anti-corrosive nature of these alloys. Hastelloy's are high temperature corrosion resistant superalloys that are primarily nickel alloys containing various amount of molybdenum, chromium, colbalt, iron, copper, manganese, titanium, zirconium, aluminum, carbon and tungsten.


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CAUTION: Safety is very important when etching. Be sure to wear the appropriate protective clothing and observe all WARNINGS on chemical manufacuters SDS (Safety Data Sheets). Also review the COMMENTS and CONDITIONS Section for each etchant.

Sample Preparation:
Hastelloy's must be properly prepared to reveal the true metallographic microstructure. A number of recommended procedures can be found at the following links:

PACE Technologies Recommended Preparation for Super Alloys PACE Technologies Metallographic MET-MANUAL Link

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Recommended Etchants
Etchant Conc. Conditions Comments
Adlers Etchant:
Ferric chloride
Copper ammonium chloride
Hydrochloric acid
Distilled water

45 gm
9 gm
150 ml
75 ml
Immerse for several seconds. A very effective etchant for Hastelloy metals

Metallographic micrograph of etched Hastelloy

Hastelloy etched with Adlers etchant, Mag. 200X (DIC).
Composition: Molybdenum: 8-10%, Chromium: 20.5-23%,
Iron: 17-20%, Tungsten: 0.2-1%, Cobalt: 0.5-2.5%,
Carbon: 0.05-.015%, Silicon: 1%, Manganese: 1%,
Boron: 0.01%, Phosphorus: 0.04%, Sulfur: 0.03%,
Nickel: Remainder


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