Black Hard Anodizing
The Black Hard Anodizing or hard dark oxidation allows obtaining all the features of hard oxidation and the aesthetic characteristics of black oxide coloration.
- Substantial growth of the superficial hardness (>500 HV₀₀₅ according to UNI 7796 norms);
- Resistance to corrosion of the hard oxide layer;
- Increased resistance to wear and tear and abrasion;
- Moderate thermic isolation
From 20 to 50 µm according to initial alloy features and needs.
Hard dark oxidation applies to 1000, 5000, 6000, 7000 alloys and up until G-Alsi5 for shell fusion.