The hard anodizing, or hard oxidation creates a hard oxide (present in nature as corundum) through the flow of electricity according to specific parameters in baths kept at a temperature below 0C.
- Substantial growth of the superficial hardness (>500 HV₀₀₅ according to UNI 7796 norms);
- Resistance to corrosion (336 hours in the saline fogs according to UNI ISO 6227norms);
- Increased resistance to wear and tear and abrasion;
- Moderate thermic isolation.
From 20 to 60 µm according to initial alloy features and needs.
Multiple shades of dark grey (according to aluminium alloy use and oxide width).
Hard Oxidation applies to 1000, 5000, 6000, 7000 alloys and die-casting production alloys or shell fusion.