Theory 153/Steel corrosion/Ratio lens
Damage Is Anode Against Cathode
The claim
Corrosion penetration is set by the ratio of anodic to cathodic area, so a small anode coupled to a large cathode corrodes very fast.
01Mechanism
The cathodic reaction drives dissolution concentrated at the anode; the area ratio sets the current density.
02Prediction
Penetration should track the area ratio.
03Refutation
Penetration tracking total current would remove the geometry.