Electrochemical Oxide Layer Formation on Valve Metals

Electrochemical Oxide Layer Formation on Valve Metals 

Valve metals bear this name due to the fact that they pass current in only one direction (rectifying effect), that is, the anodic current is low for potentials lower than the 

This equation is identical to the experimental Equation 1.1 using the equalities  

For homogeneous oxide layers the field strength E can be determined from the potential drop A pox across the oxide and the layer thickness df. 

For galvanostatic oxide growth (log i = const) the E field has to be constant resulting immediately in the proportionality  

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