Gravimetric and electrochemical testing of multipurpose corrosion inhibitors with biocidal action

• L.V. Frolova¹, R.V. Kashkovsky and A.O. Sayapin²

¹ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
² Gubkin Russian State University of Oil and Gas, 65 Leninsky Prospekt, Moscow, 119991, Russian Federation

Abstract: The article presents the results of studies of industrial additives as universal compositions that can simultaneously absorb hydrogen sulfide and inhibit the corrosion of carbon steel in low-mineralized H₂S containing media with different acidity. Gravimetric tests were carried out and the current-voltage characteristics of the steel immersed in a 0.5% solution of NaCl without and in the presence of bactericides and hydrogen sulfide were measured. The effectiveness of the absorbing effect of the studied additives was estimated by correlating the kinetics of C(H₂S) reduction in background and inhibited media. On the basis of a complex of corrosion and electrochemical studies, the influence of the acidity of the medium was discussed, as well as the inherent insignificant concentrations of hydrogen sulfide on the protective ability of the studied substances. According to the results of the tests, we have shown that industrial bactericides have actually the ability to absorb hydrogen sulfide. These compounds are inhibitors of anodic action and their effective inhibitory concentration is at least 50 mg/L. he protective ability of additives increases with decreasing acidity of the medium, as well as with an increase in the exposure time of the steel sample in a corrosive environment. In all our experiments, we compared the effectiveness of industrial additives with a known inhibitor and a bactericide – hexamine.

Keywords: steel, corrosion protection, inhibitor, sulfide

Int. J. Corros. Scale Inhib., 2019, 8, no. 3, 529-538 PDF (479 K)
doi: 10.17675/2305-6894-2019-8-3-4

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