Effects of temperature, concentration and synergism on green Schiff bases synthesized from vanillin in applications as corrosion inhibitors for carbon steel in well stimulation

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外文摘要：Mild carbon steel is widely used in construction materials owing to its relatively low price, ease of manufacture and high tensile strength. When it is subjected to an aggressive environment, the use of efficient corrosion inhibitors is required. The offshore oil and gas industry apply well stimulation techniques employing strong acids (5-35 wt%), which severely damage metallic structures. Conventional inhibitors may result in environmental and human health problems. In order to avoid that, green compounds have been widely investigated. However in certain applications, such as materials for offshore installations, protection is afforded by multi-component formulations. The synergistic effect of formulations is achieved by the active compounds, intensifiers, surfactants and solvents. Thus the performance of three Schiff bases synthesized from vanillin, a green aldehyde, and aromatic amines was investigated in corrosion inhibition of carbon steel. Weight loss measurements were made in 2 M and 15% HC1 over a 313K-353K temperature range in concentrations between 0.4%wt./v and 1.0%wt./v. Effects of binary and ternary mixtures in 15% HC1 revealed an increased efficiency for isolated inhibitors at higher concentrations. The addition of potassium iodide enhanced efficiency to 97.78% in 15% HC1 at 333 K. Electrochemical tests indicated mixed-type inhibitors. Surface analysis confirmed the presence of a protective film as well as reduced carbon steel roughness. Density-functional theory (DFT) calculations revealed the effects of a substituent on structural and electronic properties in the neutral and acid phases. The role of a sulfur atom in preventing corrosion was also addressed by DFT calculations.

外文关键词：

Carbon steelCorrosion protectionAcid inhibitionElectrochemical testsSchiff bases

作者：

Luana B. Furtado、R.C. Nascimento、Fabio J.F.S. Henrique

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作者单位：

Department of Organic Processes, School of Chemistry, Federal University of Rio de Janeiro, Technology Center, Rio de Janeiro, RJ, Brazil

LAQV-REQUIMTE, Instituto de Investigacao e Formacao Avancada, Universidade de Evora, Colegio Lufs Antonio Verney, 7000-671, Evora, Portugal

Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil

出版年：

2022

DOI：

10.1016/j.petrol.2022.110401

Journal of Petroleum Science & Engineering

ISSN：0920-4105

年,卷(期)：2022.213

被引量3
参考文献量69