PROTECTIVE PROPERTIES OF «SOLING» SERIES INHIBITORS IN ACIDIC MEDIA CONTAINING HYDROGEN SULPHIDE

Abstract

The work presents the results of the study of a number of inhibitory compositions of the “Soling” series based on acetylenic alcohols and their mixtures with nitrogen-containing compounds of various types in a hydrochloric acid (0.1 M HCl) containing 100 ppm of hydrogen sulphide. Gravimetric tests and electrochemical studies were performed on mild steel St3 at ambient temperature. The exposure time of the samples was 24 h. Polarization curves were obtained in a three-electrode cell, using the SOLARTRON 1280 C electrochemical measuring complex. The following protective compositions were studied: Soling IK-1 on the basis of unsaturated alcohol in a mixture with sulfur-containing amide in an aqueous medium; Soling IK-2 on the basis of unsaturated alcohol with additions of quaternary ammonium salt and complexone; Soling IK-3 on the basis of unsaturated alcohol in the system of organic solvents, as well as Soling IK-4(A) on the basis of a high-molecular nitrogen-containing surfactant (molecular weight from 300 to 400) with additions of unsaturated alcohol in a system of organic solvents and Soling IR-4(B) based on a high-molecular nitrogen-containing surfactant with a molecular weight of up to 300. It has been obtained that the use of unsaturated alcohols without additives in the presence of hydrogen sulphide is possible only at sufficiently high concentrations. At low concentrations, the corrosion process is markedly stimulated (composition IK-3). In a mixture with nitrogen-containing compounds (compositions IK-1, IK-2, IK-4(A)) it is possible to achieve high protective effect allowing the use of these compositions for hydrogen sulfide-containing media. The most effective are the compositions IK-2 and IK-4(A), for which the protective effect reaches the values of 97 and 90%, respectively, and also these compositions in the whole range of concentrations studied eliminate the appearance of hydrogen blistering. In most cases, the studied compositions are characterized by effective inhibition of the partial cathodic process. For SolIng IK-2 inhibition of the partial anodic reaction is clearly expressed.Forcitation:Menshikov I.A., Shein A.B. Protective properties of «Soling» series inhibitors in acidic media containing hydrogen sulphide. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 7. P. 90-97