Session: Corrosion Inhibitors in the Oil and Gas Industry (Part III of III)
Galvanic Interactions on carbon steel in inhibited CO2 environments (C2026-00435)
Thursday, March 19, 2026
4:30 PM - 5:00 PM Central
Location: 362 DE
Earn .5 PDH
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Corrosion inhibitors have been used to treat production pipelines with high susceptibility to carbon dioxide (CO2) corrosion. A successful chemical treatment requires selection of the proper inhibitor, injection of the right dose and continuous monitoring. In some cases, the non-homogeneous distribution of corrosion inhibitors due to the presence of corrosion scales or deposits can lead to severe localized damage of metallic surface. Part of the present research was focused on the study of galvanic interactions between inhibited and non-inhibited regions of a pipe. A modified split cell was implemented to study galvanic interactions due to inhibitor concentration cells. Benzyldimethyltetrasdecylammonium chloride (C14-Quat) was evaluated on this study and was confirmed to be a mixed inhibitor. The galvanic current increased as the concentration of C14-Quat increased, thus increasing the concentration gradient with respect the no inhibitor condition. Additionally, it was observed that the pre-corrosion and microstructure of the material are factors that interfere with the adsorption of C14-Quat. At concentrations higher than CMC, a reverse in polarity was observed indicating that enhanced Fe dissolution probably altered the nature and electrical behavior of available sites for adsorption.
