Analysis of the heavy oil distillation cuts corrosion by electrospray ionization FT-ICR mass spectrometry, electrochemical impedance spectroscopy, and scanning electron microscopy

CATEGORY: CORROSION
Fuel, Volume 104, February 2013, Pages 656–663
10th Japan/China Symposium on Coal and C1 Chemistry
Analysis of the heavy oil distillation cuts corrosion by electrospray ionization FT-ICR mass spectrometry, electrochemical impedance spectroscopy, and scanning electron microscopy
S. Freitas, M.M. Malacarne, W. Romão, G.P. Dalmaschio, E.V.R. Castro, V.G. Celante, M.B.J.G. Freitas,
Federal University of Espírito Santo, Chemistry Department, Laboratory of Research and Development of Methodologies for Analysis of Oils, Espírito Santo, Av. Fernando Ferrari, 514, 29075-910 Goiabeiras, Brazil
Abstract
Reports a study of the correlation between the composition of heavy distillation cuts and the corrosion process.  Results of electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR MS), detected naphthenic acid species in the seven cuts studied. The relative abundance of heavy naphthenic acids increase with distillation cut temperature.
Naphthenic acids (O2 class) and carbazoles (N class) were detected as polar species in the residue. The corrosion mechanism for AISI 1020 steel in the heavy oil and distillation cuts was determined by electrochemical impedance spectroscopy and scanning electron microscopy. The equivalent electrical circuits proposed for the dehydrated oil, its distillation cuts and the residue are based on observations obtained from the Nyquist and Bode diagrams.
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