Investigating Electrochemical Performance of Imidazoline-based Corrosion Inhibitors with Novel Low-Dose Additives for Batch Applications

Abstract Imidazoline-based corrosion inhibitors have been extensively utilized for corrosion protection in the oil industry. With increasing emphasis on sustainability and cost-effectiveness, low-dose additives have emerged as a promising innovative approach that support both environmental and economic sustainability goals. This study is in continuation to a previous laboratory investigation initiated to understand the if novel additives improve the efficacy of imidazoline-based inhibitors. Phase I of the study revealed that this additive, even at low concentrations, synergistically improved the performance of the imidazoline-based inhibitors when directly injected into the medium, representing continuous application. The current study (Phase II) focuses on determining if novel additives perform as well in batch applications. Electrochemical assessments, including Linear Polarization Resistance (LPR), Anodic-Cathodic Polarization (ACP), and Electrochemical Impedance Spectroscopy (EIS), were conducted with Rotating Cylinder Electrodes (RCE) using a dip-and-drip procedure. Variations in rotational speeds were examined to assess the additive’s impact on inhibitor persistency. Preliminary results indicate that low dosages of this additive significantly enhance the effectiveness of imidazoline-based inhibitors even in batch applications, offering a promising advancement in corrosion protection while aligning with environmental standards. Efforts towards sustainability look promising – without compromising excellent performance while reducing corrosion inhibitor usage.