Empress Catherine II Saint Petersburg Mining University, Saint Petersburg, Russia

A. I. Perina, Cand. Chem., Associate Prof., e-mail: n.toyma@mail.ru
V. Yu. Piiraynen, Dr. Eng., Prof., e-mail: piraynen@gmail.com
V. V. Khachinikolaev, Postgraduate Student, e-mail: vladimr.vladimrov@gmail.com
M. S. Guseva, Student, e-mail: gusevams@list.ru

This study is dedicated to the development of a method for real-time monitoring and evaluation of the effectiveness of anticorrosion protection for carbon steels operating in aggressive environments. The proposed method is based on optical monitoring combined with computer-assisted analysis of the surface condition of test specimens under simulated aggressive conditions. The research presents the results of evaluating the performance of various corrosion inhibitors, with particular emphasis on the critical issue of hydrogen sulfide (H2S)-induced corrosion of carbon steels—a major cause of severe damage to pipelines and process equipment in the oil and gas industry. The work includes a review of the existing classification of corrosion inhibitors and their mechanisms of action. A novel conceptual approach to assessing inhibitor efficiency is proposed, integrating traditional quantitative gravimetric analysis with qualitative evaluation via specialized software. This combined methodology enables not only highly accurate quantification of corrosion damage but also detailed temporal tracking of the corrosion process and objective comparative assessment of different inhibitors. The experimental section involved testing a broad range of nitrogen-containing compounds, including commercially available inhibitor formulations Poly-Inkor 365 and NORUST® 9805. Tests were carried out in a specially designed test medium simulating gas condensate conditions. The effectiveness of anticorrosion protection was evaluated using computer image analysis of photographs capturing the surface of the test specimens over time. The results demonstrated that diphenylamine, glutamic acid, and 1-naphthylamine exhibited superior anticorrosion performance. In certain key parameters—particularly the duration of corrosion inhibition and the rate of corrosion propagation—these compounds outperformed the commercial formulations. The successful validation of this new methodology provides a strong foundation for its application in the future development of next-generation corrosion inhibitors that combine ecological safety, thermal stability, and high efficacy at minimal concentrations. Achieving these criteria is expected to significantly reduce both operational costs and the environmental footprint of oil and gas operations.
The research was conducted using the laboratory facilities of the Scientific Center “Problems of processing of mineral and man-made resources”.
The authors express their gratitude to Felix Konstantinovich Vanderlinsky and Elizaveta Valerievna Serova for their assistance in conducting experimental studies, as well as to Semyon Sergeevich Lukiyanchuk for his contribution to the mathematical processing of experimental data.

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