Abstract
Pitting corrosion and its protection of carbon steel are studied by using an electrochemical technique. In order to prevent pitting corrosion, it is important to know whether the pre-existing pits continue to propagate or undergo repassivation. A critical potential at which the repassivation of pit begins to undergo is designated as the inversion potential and proposed as a characteristic value that determines susceptibility to pitting corrosion. This potential was a function of the bulk concentration of chloride ions and the time of polarization. The alkylamines which had the alkyl groups of large carbon numbers, i. e., di-n-amylamine and di-n-hexylamine were benificial as the inhibitors for pitting corrosion of carbon steel.
