EN AW-7075 | AlZn5,5MgCu | AA7075 Barker etching
| Numeric designation | EN AW-7075 | AA7075 |
|---|---|
| Chemical designation | AlZn5,5MgCu |
| Etching | NaOH vs. Barker |
Compared to NaOH, which attacks the precipitations and only vaguely suggests grain boundaries, electrolytic Barker etching makes the grain structure (in polarized light) of the extruded alloy clearly visible.
