Inhibition of Pitting Corrosion of Type 304L Stainless Steel By Surface Active Compounds

摘要

A series of compounds having the N-acylamino acid or a related structure were investigated for the inhibition of localized corrosion of AISI Type 304L stainless steel. The effects of the inhibitor concentration on the breakdown potential and solution surface tension were determined using a buffered (pH 5.2) chloride solution. Interaction of the inhibitor with the electrode surface was studied as a function of potential using capacitance measurements. These surface active agents interact strongly with the 304L surface, probably through multiple attachment to the surface atoms. Evidence is presented for the formation of a hemimicelle layer and surface pH buffering effects which contribute to the observed pitting inhibition effects.