General purpose reagent. Attacks FeAl3,other constituents outlined. Grain contrast usually poor.The 0.5% concentration of HF is very popular. Use by swabbing.
(2)Keller’s Reagent 2.5 mL HNO3 1.5 mL HCI 1 mL HF 95 mL distilled water
Very popular general purpose reagant for Al and Al alloys, except high Si alloys. Swab sample 10-20 seconds. Wash in warm water. Can follow with a dip in concentrated HNO3. Outlines all common constituents, reveals grain boundaries in certain alloys.
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