TY - JOUR
T1 - Effect of organic anions on ionic liquids as corrosion inhibitors of steel in sulfuric acid solution
AU - Likhanova, Natalya V.
AU - Arellanes-Lozada, P.
AU - Olivares-Xometl, O.
AU - Hernández-Cocoletzi, H.
AU - Lijanova, Irina V.
AU - Arriola-Morales, Janette
AU - Castellanos-Aguila, J. E.
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - Two new ionic liquids (ILs), N-ethyl-N,N,N-trihexylammonium adipate (CPA 6 ) and N-ethyl-N,N,N-trioctylammonium ethyl sulfate (ESA 8 ), were synthesized and their chemical structures were determined by 1 H and 13 C NMR. The corrosion inhibition effect of the ILs on API-X60 steel in 1 M H 2 SO 4 was studied by weight loss, Tafel polarization curves and polarization resistance. The experimental results show that the ILs were adsorbed on API-X60 steel and blocked surface active sites, reducing the corrosion rate of the metallic substrate. The ILs behaved as mixed-type corrosion inhibitors and their adsorption process obeyed the Langmuir isotherm model. The adsorption phenomenon was studied by means of the XPS, DRIFT and SEM/EDS techniques. Quantum chemical parameters were obtained from the studied ILs, calculated in vacuum and water systems, and correlated with the experimental results. The effect of organic anions on the ILs was analyzed and it was concluded that the ethyl sulfate anion presented better corrosion inhibition properties than the adipate anion; therefore, ESA 8 was a more efficient corrosion inhibitor than CPA 6 .
AB - Two new ionic liquids (ILs), N-ethyl-N,N,N-trihexylammonium adipate (CPA 6 ) and N-ethyl-N,N,N-trioctylammonium ethyl sulfate (ESA 8 ), were synthesized and their chemical structures were determined by 1 H and 13 C NMR. The corrosion inhibition effect of the ILs on API-X60 steel in 1 M H 2 SO 4 was studied by weight loss, Tafel polarization curves and polarization resistance. The experimental results show that the ILs were adsorbed on API-X60 steel and blocked surface active sites, reducing the corrosion rate of the metallic substrate. The ILs behaved as mixed-type corrosion inhibitors and their adsorption process obeyed the Langmuir isotherm model. The adsorption phenomenon was studied by means of the XPS, DRIFT and SEM/EDS techniques. Quantum chemical parameters were obtained from the studied ILs, calculated in vacuum and water systems, and correlated with the experimental results. The effect of organic anions on the ILs was analyzed and it was concluded that the ethyl sulfate anion presented better corrosion inhibition properties than the adipate anion; therefore, ESA 8 was a more efficient corrosion inhibitor than CPA 6 .
KW - Carbon steel
KW - Corrosion inhibitor
KW - Ionic liquid
KW - Sulfuric acid
UR - http://www.scopus.com/inward/record.url?scp=85060763901&partnerID=8YFLogxK
U2 - 10.1016/j.molliq.2019.01.126
DO - 10.1016/j.molliq.2019.01.126
M3 - Artículo
SN - 0167-7322
VL - 279
SP - 267
EP - 278
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
ER -