Hydrogen Evolution and Absorption in an \API\ \X100\ Line Pipe Steel Exposed to Near-Neutral pH Solutions
By Hung M. Ha and Ibrahim M. Gadala and Akram Alfantazi
Published in Electrochimica Acta
2016
Abstract
Hydrogen evolution kinetics and hydrogen absorption in an \API\ \X100\ line pipe steel exposed to near-neutral pH solutions is studied in this work. At the corrosion potential, dissolved \CO2\ in the solution accelerates the hydrogen evolution kinetics through the carbonic acid discharge reaction. At potentials more negative than the corrosion potential, hydrogen evolution due to bicarbonate discharge dominates the other cathodic reactions occurring at the ocp. The hydrogen diffusivity in the \API\ \X100\ steel is found to be approximately 4.4