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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Passivation of the Zinc Anode of a Crude Oil Vertical Separator Resulting in Corrosion
Author(s)
Fernando Benedicto Mainier*, Juan Manuel Pardal, Pedro Paulo Barbosa Leite and Marcone Freitas dos Reis
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DOI:10.17265/2161-6221/2016.3-4.001
Affiliation(s)
Engineering School, Federal Fluminense University (UFF), Niterói, Rio de Janeiro, 24220-261, Brazil
ABSTRACT
This paper presents the results of chemical analysis and laboratory tests to evaluate the performance of zinc anodes in the internal chambers of a crude oil vertical separator. Frequently, sediments and saline water are co-produced with crude oil and the basic function of a tri-phase separator is to separate the oil and gas from the saline water and natural contaminants. It has been observed that corrosion has taken place in the internal chamber due to the failure of the zinc anodes. This anode failure is associated with scale deposition on the anode surface and the high temperature used in oil-water separation. Chemical analysis indicated that this deposit is composed of basic zinc chloride, zinc carbonae and oily materials. On the basis of the laboratory tests, a mechanism to explain the failure of the zinc anode is proposed.
KEYWORDS
Corrosion, failures, zinc anode, crude oil vertical separator, passivation.
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