Hard Anodized Aluminum Cookware and My Recommendation. Anodized Aluminum Cookware Manufacturers and industry lobbyists all claim it is safe. Their biggest argument is that the amount of aluminum leached from hard anodized aluminum cookware is a mere 35 micrograms.
What is Anodizing? By definition, anodizing is "a process to electrolytically coat a metallic surface with a protective or decorative oxide."The anodic coating consists of hydrated aluminum oxide and is considered resistant to corrosion and abrasion.
The metal part to be treated (generally aluminum) is first submerged in an electrolytic solution bath along with a cathode. When a current is passed through the acid solution hydrogen is released from the cathode and oxygen forms on the surface of an anode.