TY - JOUR
T1 - Study of corrosion behavior of API 5L X52 steel in sulfuric acid in the presence of ionic liquid 1-ethyl 3-methylimidazolium thiocyanate as corrosion inhibitor
AU - Corrales Luna, M.
AU - Le Manh, Tu
AU - Cabrera Sierra, R.
AU - Medina Flores, J. V.
AU - Lartundo Rojas, L.
AU - Arce Estrada, E. M.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - The inhibition effect of ionic liquid (IL) 1-ethyl-3- methylimidazolium thiocyanate (EMIM)+(SCN)− on the corrosion of API 5L X52 steel in 0.5 M H2SO4 solution at different temperatures were studied, using gravimetrical, electrochemical, spectroscopic and simulation methods. The highest efficiency and the optimal concentrations were 90.1% and 75 ppm of the IL, respectively. Scanning electron microscopy characterization reveals less surface damage in the corroded samples confirming the effectiveness of the IL, while X-ray photoelectron spectroscopy analysis evidenced the formation of an interfacial protective layer, composed by the inhibitor molecules and corrosion products. Polarization measurements showed that the IL is a mixed-type inhibitor, retarding the dissolution of mild steel and hydrogen evolution reactions, enhancing its efficiency as a function of its concentration; besides a minor influence of the temperature in the inhibition efficiency is recorded by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. A competitive chemisorption process is observed on steel obeying a Langmuir isotherm. Ultraviolet-visible spectroscopy confirmed chemical interaction between IL and metal surface. The density functional theory and molecular dynamic (MD) simulation were used to correlate with the experimental results and determine the adsorption energy of the inhibitor in different substrate's crystallographic planes. Furthermore, from the results of the interaction between the inhibitor molecules in the presence of water on the steel surface using MD on seven most compact planes of BCC system, it was capable of establishing a correlation between adsorption energies of the inhibitor and the crystallographic texture and the surface roughness of the studied steel.
AB - The inhibition effect of ionic liquid (IL) 1-ethyl-3- methylimidazolium thiocyanate (EMIM)+(SCN)− on the corrosion of API 5L X52 steel in 0.5 M H2SO4 solution at different temperatures were studied, using gravimetrical, electrochemical, spectroscopic and simulation methods. The highest efficiency and the optimal concentrations were 90.1% and 75 ppm of the IL, respectively. Scanning electron microscopy characterization reveals less surface damage in the corroded samples confirming the effectiveness of the IL, while X-ray photoelectron spectroscopy analysis evidenced the formation of an interfacial protective layer, composed by the inhibitor molecules and corrosion products. Polarization measurements showed that the IL is a mixed-type inhibitor, retarding the dissolution of mild steel and hydrogen evolution reactions, enhancing its efficiency as a function of its concentration; besides a minor influence of the temperature in the inhibition efficiency is recorded by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. A competitive chemisorption process is observed on steel obeying a Langmuir isotherm. Ultraviolet-visible spectroscopy confirmed chemical interaction between IL and metal surface. The density functional theory and molecular dynamic (MD) simulation were used to correlate with the experimental results and determine the adsorption energy of the inhibitor in different substrate's crystallographic planes. Furthermore, from the results of the interaction between the inhibitor molecules in the presence of water on the steel surface using MD on seven most compact planes of BCC system, it was capable of establishing a correlation between adsorption energies of the inhibitor and the crystallographic texture and the surface roughness of the studied steel.
KW - API 5L X52 steel
KW - Adsorption energy
KW - Corrosion inhibitor
KW - Crystallographic texture
KW - Density functional theory
KW - Ionic liquid
KW - Molecular dynamic simulation
UR - http://www.scopus.com/inward/record.url?scp=85067282168&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.111106
DO - 10.1016/j.molliq.2019.111106
M3 - Artículo
AN - SCOPUS:85067282168
SN - 0167-7322
VL - 289
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
M1 - 111106
ER -