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Effect of oil in multiphase flow on corrosion product film in large horizontal pipeline
Author(s) -
Hong T.,
Gopal M.,
Jepson W.P.
Publication year - 2000
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/1521-4176(200006)51:6<439::aid-maco439>3.0.co;2-8
Subject(s) - corrosion , diffusion , materials science , physics , analytical chemistry (journal) , nuclear chemistry , metallurgy , chemistry , thermodynamics , chromatography
The properties of corrosion product film formed on carbon steel pipelines under saltwater‐oil‐CO 2 multiphase flow are examined by AC impedance methods. Experiments are performed in a 101.6 cm I.D., 10 m long pipeline. Experimental results show that there are two reactions on the steel surface in saltwater‐oil mixture. One is charge transfer, and the other is diffusion. By calculation of charge transfer resistance, R t , and Warburg impedance coefficient, σ, it is found that, R t in saltwater‐oil mixture is much higher than that in saltwater. In saltwater‐oil mixture, R t and σ increase with immersion time. It is suggested that the porous corrosion film occurs on the surface of the steel, and that the film becomes compact when the immersion time increases. The longer the exposure time, the more compact the film, resulting in that the corrosion rate becomes lower.