Using a powder disk electrode (PDE) made with micron-sized, high purity iron metal we investigated how the corrosion of this material is affected by solution conditions that are relevant to the degradation of containments in environmental remediation applications. Changes in corrosion potential (Ecoor) with time showed that low pH, high concentrations, of chloride, ad natural organic matter led to breakdwon of the passive film. Bicarbonate caused Ecoor to decline into the active potential region rapidly, but the Ecoor rose back into the passive region over 10's of hours. The short term decline in Ecoor was greatest at higher pH's, suggesting a specific effect of HCO3 rather than a general effeoc of pH.
Revised: December 23, 2008 |
Published: January 1, 2008
Citation
Nurmi J.T., and P.G. Tratnyek. 2008.Electrochemical Studies of Packed Iron Powder Electrodes: Effects of Common Constituents of Natural Waters on Corrosion Potential.Corrosion Science 50, no. 1:144-154.PNNL-SA-52703.doi:10.1016/j.corsci.2007.06.016