Influence of Alternating Current on Corrosion of Mild Steel: Behavior in 1 N Sulfuric Acid

Corrosion behavior of mild steel in 1 N sulfuric acid subject to alternating currents in the range 250 micro-amp to 100 mA cm-2 at frequencies varying from 30 to 1000 cps is reported. It was found that at low current values, the corrosion rate increases with frequencies up to 200 cps, but diminishes with frequencies above this rate. At relatively high current values, the corrosion rate decreases with increasing frequencies. A qualitative explanation of the observations is suggested.