Resistance of Al–Zn–Mg alloys to SCC in an aqueous Cl-containing environment generally increases with oxide film thickness for films formed by anodising in tartaric acid up to 2000 Å (0·2 μm) thick. This result, together with earlier work by others on thicker films, shows that SCC resistance increases with thickness in smaller thickness regimes (up to 0·2 μm and from 1·7 to 3·4 μm) but, in general, not in larger regimes.
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