True; however, this is an aluminium alloy. These typically have lower corrosion resistance and are most commonly anodized because of it. The applied layer is typically 3 to 5x thicker than that formed by pure aluminium oxidization.
Yes but anodization implies thickness around ~5–25 micrometers (µm) for aluminum. The natural oxide coating is ~2-5 nanometers (1,000–5,000× less thick).
