Experimental and surface morphological study of corrosion inhibition of N80 carbon steel in HCl stimulated acidizing sol
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Experimental and surface morphological study of corrosion inhibition of N80 carbon steel in HCl stimulated acidizing solution using gum exudate from Terminalia Mentaly Nkem B. Iroha1 · Onyewuchi Akaranta2 Received: 11 May 2020 / Accepted: 5 August 2020 © Springer Nature Switzerland AG 2020
Abstract The gum exudate from Terminalia Mentaly (GETM) was investigated for corrosion inhibition of N80 carbon steel in 1 M HCl solution using electrochemical and gravimetric measurements. GETM was found to be a good inhibitor for N80 steel corrosion in the 1 M HCl stimulated acidizing solution, affecting both cathodic and anodic reactions. The inhibition efficiency of GETM increased as the concentration increases but decreased with rise in temperature. Maximum inhibition efficiencies of 92.4%, 95.5% and 92.5% were obtained from electrochemical ımpedance spectroscopy (EIS), gravimetric and potentiodynamic polarization studies respectively, at 2.0 g/L GETM in 1 M HCl. Adsorption of GETM at the studied temperatures was found to follow Langmuir and Temkin isotherms and the action of inhibition suggests both physical and chemical adsorption on the metal surface. It was found from polarization study that GETM is a mixed type inhibitor but slightly acted more like an anodic inhibitor. EIS studies revealed that GETM increased the charge transfer resistance while diminishing the double layer capacitance with increasing concentration due to the formation of protective film on the steel. Surface morphological study performed using scanning electron microscopy (SEM) confirmed the formation of protective film of GETM on the N80 steel surface. Keywords Gum exudate · Terminalia mentaly · Corrosion inhibition · N80 steel · Acidizing solution · Charge transfer resistance · Langmuir isotherm
1 Introduction Hydrochloric acid stimulated acidizing solution is mainly used in the oil and gas industries during acid treatment to improve the productivity of oil wells. Acidizing have been in existence for over 100 years and predates every other technique of well stimulation including hydraulic fracturing. However, lack of efficient acid corrosion inhibitors to ensure the protection of pipeline steels in the wells limited the use of acidizing up until the early 1930′s.[1]. Having
developed effective inhibitors for acid corrosion, acidizing of oil wells proliferated, leading to establishment of the well stimulation service industry. It is widely known today, that acidizing also known as acid treatment is one of the most effective means for improving stimulation (productivity) of wells in the oil and gas industry [2]. Several researches have been carried out on the application of various inorganic and organic compounds as corrosion inhibitors for metals in acidic medium. Most of the effective inhibitors have been those containing
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42452-020-03296-8) contains supplementary material, which is available to authorized users. * Nkem B. Iroha, [email protected]
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