Effect of octadecylamine on the corrosion behavior of Type 316SS in acetate buffer

By Feixiong Mao and Chaofang Dong and Digby D. Macdonald
Published in Corrosion Science NULL 2015

Abstract

The inhibitory effect of octadecylamine (ODA) on the corrosion and passivity breakdown of Type 316SS in acetic acid solution was characterized using potentiodynamic polarization, cyclic voltammetry, and electrochemical impedance spectroscopy (EIS). The inhibition mechanism of \ODA\ was defined by optimizing the Bi-layer Point Defect Model on the \EIS\ data. The optimization results indicated that, as either the concentration of \ODA\ or the immersion time increases, the inhibitor-modified outer layer resistance, the charge transfer resistance, and the Warburg coefficient for the transport of species through the porous outer layer of the passive film all increase, thereby accounting for the observed inhibition.

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