TITANIUM ETCHANTS
Please use the table below to select the correct etchant for your titanium alloy.
| Grade of Titanium: | Etchant to Use: |
| Unknown grade titanium alloys | Kroll’s |
| Beta C | |
| CP Ti (Commercially pure titanium, Grades 1, 2, 3, 4) | |
| Ti 15-3 | |
| Ti 21S (Beta 21S) | |
| Ti 3-2.5 (Ti 3Al-2.5V, Grade 9) | |
| Ti 5-2.5 (Ti 5Al-2.5Sn, Grade 6) | |
| Ti 6-2-4-2 (Ti 6Al-2Sn-4Zr-2Mo) | |
| Ti 6-4 (Ti 6Al-4V, Grade 5) | |
| Ti 6-6-2 (Ti 6Al-6V-2Sn) | |
| Alpha case detection | First Kroll’s then 2% HF |
| Nitinol, Ni-Ti alloy | ASTM 151 |
| Macro-etching titanium | AWS D1.9 Titanium weld etch |
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