Titanium Etchants

Please use the table below to select the correct etchant for your titanium alloy.

Titanium Alloy:	Etchant to Use:
Unknown titanium grade	Kroll’s
Beta C	Kroll’s
CP Ti (Commercially pure titanium, Grades 1, 2, 3, 4)	Kroll’s
Ti 15-3	Kroll’s
Ti 21S (Beta 21S)	Kroll’s
Ti 3-2.5 (Ti 3Al-2.5V, Grade 9)	Kroll’s
Ti 5-2.5 (Ti 5Al-2.5Sn, Grade 6)	Kroll’s
Ti 6-2-4-2 (Ti 6Al-2Sn-4Zr-2Mo)	Kroll’s
Ti 6-4 (Ti 6Al-4V, Grade 5)	Kroll’s
Ti 6-6-2 (Ti 6Al-6V-2Sn)	Kroll’s
Alpha case detection	First Kroll’s then 2% HF
Nitinol, Ni-Ti alloy	ASTM 151
Macro-etching titanium	AWS D1.9 Titanium weld etch