Ability of a metal to perform its functions in a given corrosion system without being affected by corrosion.

Explanation: If the planner requires that a component must be corrosion resistant, this means that the material (e.g. stainless steel) from which this component is to be manufactured will not suffer any corrosion damage in the long term under the given boundary conditions.
It is then not permissible to use a material with coatings or overlays. This could restrict the function of the component and increase the risk of corrosion again.