Investigation into the adsorption and inhibition properties of sodium octanoate against CO2 corrosion of C1018 carbon steel under static and hydrodynamic conditions

被引：9
|
作者：
Onyeachu, Ikenna B. [1 ,6 ]
Njoku, Demian I. [2 ,6 ]
Nwanonenyi, Simeon C. [3 ,6 ]
Ahanotu, Cornelius C. [4 ]
Etiowo, Kokolo M. [5 ]
机构：
[1] Edo State Univ Uzairue, Dept Ind Chem, PMB 04 Auchi, Iyamho, Edo State, Nigeria
[2] Madonna Univ Nigeria, Dept Ind Chem, PMB 05 Elele, Elele, Rivers State, Nigeria
[3] Fed Univ Technol Owerri, Dept Polymer & Text Engn, PMB 1526 Owerri, Owerri, Imo State, Nigeria
[4] Imo State Polytech Omuma, Dept Sci Lab Technol, Omuma, Imo State, Nigeria
[5] Univ Calabar, Dept Pure & Appl Chem, Calabar, Nigeria
[6] Fed Univ Technol Owerri, Afr Ctr Excellence Future Energies & Electrochem S, Owerri, Nigeria
来源：
SCIENTIFIC AFRICAN | 2023年 / 20卷
关键词：
Sodium octanoate; CO2; corrosion; Adsorption; Corrosion inhibitor; EIS; MILD-STEEL; BEHAVIOR; GREEN; HYDROGEN; DIOXIDE; SURFACE; BRINE;
D O I：
10.1016/j.sciaf.2023.e01603
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Sodium octanoate (Na-oct), a simple, naturally-abundant, cheap and low-toxic organic molecule has been investigated for its adsorption and inhibition properties against the CO2 corrosion of C1018 carbon steel in 3.5 % NaCl under static (0 rpm) and hydrodynamic conditions (10 0 0 rpm). At open circuit potential (OCP) under static condition, a Langmuir-type adsorption of Na-oct modified the dielectric property of the steel-solution interface by lowering double layer capacitance and increasing resistance to charge transfer, based on electrochemical impedance spectroscopy (EIS) analysis. Under this condition, potentio-dynamic polarization (PDP) analysis showed that Na-oct adsorbed more preferentially on anodic sites of steel surface and impacted-96 % inhibition efficiency. Hydrodynamic con-dition at 10 0 0 rpm caused a Langmuir and Temkin adsorption mechanism and diminished the Na-oct efficiency to-86 %. FTIR characterization revealed that the inhibitor adsorption was enabled by its COO- functional group. Computational modeling, using DFT and MDS, confirmed the experimental findings.(c) 2023 The Author(s). Published by Elsevier B.V. on behalf of African Institute of Mathematical Sciences / Next Einstein Initiative. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )
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页数：18
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