Corrosion Resistance


If a metal corrodes at the rate of less than 0.002 inch (0,05 mm) per year it is said to be corrosion resistant.

All corrosion resistant materials protect themselves by forming a protective oxide layer on the surface of the metal.

  • Aluminum forms aluminum oxide (Al2O3) and stainless steel forms chrome oxide (Cr2O3). These oxides are better known by their generic name ceramic.

When the oxide layer is formed we say the material is “passivated”. Prior to the formation of the oxide layer the material was “active”.