, can be formally expressed as an electric current which at the corrosion potential is called the corrosion current, 
, e.g. for the anodic dissolution of one component of a material with 
in
and
in 
one obtains
,
being the charge number of the electrode reaction and 
the Faraday constant.
Source:
PAC, 1989, 61, 19
(Electrochemical corrosion nomenclature (Recommendations 1988))
on page 20