Electrochemical properties of iron dissolution in the presence of CO2- Basics Revisited.
|Srdjan Nesic, Nicolas Thevenot, Jean-Loius Crolet and Dragutin M. Drazic.|
In order to shed more light on the anodic reaction mechanism in CO2
corrosion of mils steel , two different kinds of electrochemical measurements
were used : potentiodynamic sweep and galvanostatic measurements. Experiments
were conducted in a glass cell at room temperature (T=22+_ 1 C), different
CO2 partial pressures (0-1 bar), over a broad pH range (2-7) using a
rotating cylinder at 4000 rpm.
Consequences of the present findings for the CO2 corrosion area are
discussed. For example, in case of undissolved iron carbide layers,
it is no longer possible to discriminate the roles of galvanic coupling
and internal acidification.