Effect of some organic surfactants on the corrosion behavior of low-carbon steel in sulfuric acid solution

• Ya.G. Avdeev and T.E. Andreeva

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31-4, Leninsky prospect, 119071 Moscow, Russian Federation

Abstract: The corrosion of 08PS low-carbon steel in 2 M H₂SO₄ in the presence of cationic (alkylbenzyldimethylammonium chloride (Catamin AB)), amphoteric (cocamidopropyl betaine (CAPB)), anionic (sodium lauroyl sarcosinate (SLS), sodium oleoyl sarcosinate (SOS), sodium dodecylbenzenesulfonate (SDBS)), and non-ionic surfactants (indirect material ОР-10) was studied. Only Catamin AB in individual form is capable of providing effective protection of steel in 2 M H₂SO₄ solutions (t = 60°C). When creating binary and three-component composite corrosion inhibitors (CIs) based on the surfactants under study, in some cases it is possible to achieve effective protection of steel in 2 M H₂SO₄ within a wide temperature range. Among the composite CIs under study, one should note the (5 mM Catamin AB + 0.5 mM KI) and (1 mM Catamin AB + 4 mM hexamethylenetetramine + 0.5 mM KI) formulations that significantly inhibit steel corrosion in 2 M H₂SO₄ at temperatures up to 95°C inclusive. Instead of a binary formulation of CIs (surfactant + KNCS or KI) it is sometimes expedient to utilize a similar three-component CI containing a surfactant + hexamethylenetetramine + KNCS or KI for the protection of steel in H₂SO₄ solutions. In spite of an insignificant acceleration of metal corrosion in their presence compared with the binary mixture, three-component CIs make it possible to significantly reduce the consumption of surfactants.

Int. J. Corros. Scale Inhib., 2025, 14, no. 2, 823-837
doi: 10.17675/2305-6894-2025-14-2-20

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