'MECHANISM OF CORROSION AND CORROSION INHIBITION OF STEEL IN WEAK ACID SOLUTION DETERMINATION OF QUANTITATIVE LOCAL CELL POLARIZATION CURVES'

摘要

An apparatus and a procedure were developed for precise measurement of the mixed electrode potential, interface resistance, and interface capacitance of a corroding metal surface in the presence of polarizing current. The method was used, together with special instruments for measuring corrosion continuously, to obtain data from which quantitative local cell polarization diagrams could be constructed. Studies were made on mild steel corroding freely in oxygen-free salt water at pH 4 - 6, and on this electrode in the presence of several different types of corrosion inhibitors. Local cell polarization data for the inhibited surface were compared to those of the uninhibited surface, and certain conclusions were drawn regarding the mechanism by which inhibitors function.