Investigation of corrosion inhibitors with demulsifiers in their composition

• E. Podgorbunskikh, T. Skripkina, L. Semikhina and R. Abdrashitova

Laboratory of geological and hydrogeological support for the development of hydrocarbon fields, Industrial University of Tyumen, 625000 Tyumen, Russian Federation

Abstract: The paper examines the potential utilization of corrosion inhibitors reagents with a complex effect (Complex Effect Reagents, CER), containing chemical compounds that are not only typical for corrosion inhibitors but also possess demulsifying properties, as corrosion inhibitors for carbon steel. The work examines the inhibitory properties of three samples obtained by mixing a commercially produced sample with phosphorus and amine compounds, and non-ionogenic surface active agents. CERs were prepared with the addition of modifiers in the form of potassium salt of phosphoric acid (CER-1); ethoxylated phenolic resins and block copolymers of diethanolamine (CER-2); and block copolymers of diethanolamine (CER-3). The inhibition efficacy of carbon steel was demonstrated through the weight loss and potentiodynamic polarization methods, microscopic analysis of corrosion morphology (SEM, TEM), XRD, EDS, and FTIR. The most effective is the complex effect reagent mixed with phenolic resins and block copolymers of diethanolamine, which is confirmed by weight loss and potentiodynamic polarization experiments. According to the data of potentiodynamic polarization method, the inhibition efficiency of the CER with the addition of modifiers in the form of potassium salt of phosphoric acid (CER-1) has only 52%. The CER based on ethoxylated phenolic resins and diethanolamine block copolymers (CER-2) has an inhibition efficiency of 68%. The CER-3 based on block copolymers of diethanolamine (CER-3) has an inhibition efficiency of 55%.

Keywords: carbon steel, corrosion, corrosion inhibitors, demulsifiers, potentiodynamic polarization, TEM

Int. J. Corros. Scale Inhib., 2024, 13, no. 2, 892-910
doi: 10.17675/2305-6894-2024-13-2-13

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