Abstracts Book - IMRC 2018

• SE4-P005
EFFECT OF ASPHALTENES ELECTROSTATIC CHARGE IN THE
CORROSION INHIBITION OF HEAVY CRUDE OIL-SEAWATER
Manuel de Jesus Macias Hernandez 1 , Erick Marín Quiroz 1
1 Instituto Politécnico Nacional - IPN - ESIQIE, Engineering of metallurgycal and materials,
Mexico.
Heavy crude oil containing polar components as the asphaltenes, NSO complex
moelcules and Ni,V metals with brine has been potentially corrosive. however, the
asphaltnes has a role in the corrosion inhibition but it very little has been studied.
In this work, first the electrostatic charge of asphaltenes of crude oil-seawater
emulsion was obtained by asphaltenes electrodeposition in an electrophoretic cell.
Corrosion test was applied to the residual emulsion on a cooper plaque for NORM
ASTM-130. The emulsion was prepared with ku-maloob-Zaap crude oil and
seawater 50/50 w/w, adding no-ionic surfactan of 0.002 M and pH 9. An half
electrophoretic cell wiht stanley steel was used. Anionic and cationic
electrophoretic cell were separed applying a voltage differencial of +5 V and -5 V
respectivelly. Infrared analysis was realized to the residual emulsion and asphaltene
electrodeposition. Corrosion phase was observed by microstructural analysis of
emulsion film on cooper plaque plaque. The resulted show that major asphaltene
electrodeposition was obtained on anionic electrode where asphaltene charge was
negative. On the other hand, the cationic electrode presented minor asphaltene
electrodeposition wiht positive asphaltene charge. In the corrosion test, the
residual emulsion anionic electrophoretic cell presented a major corrosion
inhibition on a cooper plaque. At the end of corrosion test, the microstructure of
residual emulsion was formed by a thin monolayer in the inhibition phase and
agglomerates film in the corrosion phase.
References
A. Ajmera, W. Robbins, S. Richeter, and S. Nesic (2011) Role of asphaltenes in
inhibitiong corrosion and altering the wettability of the stell surface. Corrosion Vol.
67, No. 10, 1-11
Hunag Zeng, Yi-Qiao Song, David L. Johnson and Oliver C. Mullins (2009). Critical
nanoaggregate concentration of asphaltnes by direct-current (DC) electrical
conductivity. Energy & Fuel 23, 1201-1208.
Keywords: Asphaltenes, inhibition, corrosion
Presenting authors email: maciash@yahoo.com