Influence of pH on the electrochemical behaviour of a duplex stainless steel in highly concentrated LiBr solutions

Autores UPV
Año
Revista CORROSION SCIENCE

Abstract

The objective is to study the influence of pH on the corrosion and passive behaviour of duplex stainless steels (DSS) using potentiodynamic measurements, potentiostatic tests and electrochemical impedance spectroscopy (EIS). DSS are spontaneously passive in heavy brine LiBr solutions. Under potentiostatic conditions at applied anodic potentials within the passive domain an equivalent circuit with two time constants is the most suitable model to describe the corrosion mechanism in the interface electrolyte/passive film/metal. pH modifies the electrochemical properties of the passivity of the alloy in a 992. g/L LiBr solution reducing its resistance with the applied potential. © 2010 Elsevier Ltd.