The properties of corrosion product film formed on carbon steel pipelines under saltwater-oil-CO2 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, Rt, and Warburg impedance coefficient, sigma, it is found that, Rt in saltwater-oil mixture is much higher than that in saltwater. In saltwater-oil mixture, Rt and sigma 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.
Effect of oil in multiphase flow on corrosion product film in large horizontal pipeline
Der Einfluß von Öl in Mehrphasenströmungen auf den Korrosionsproduktfilm in großen horizontalen Rohrleitungen
Materials and Corrosion ; 51 , 6 ; 439-443
2000
5 Seiten, 8 Bilder, 2 Tabellen, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
Pipeline , Korrosionsprodukt , Oberflächenschicht , Mehrphasenströmung , Öl-in-Wasser-Emulsion , Meerwasser , Ersatzschaltbild , Ortskurve , Nyquist-Diagramm , Zeitabhängigkeit , Zeitfaktor , Porosität , Ladungsübertragung , Ladungstransport (elektrische Ladung) , Simulationsversuch , Korrosionsprüfung , kohlenstoffreicher Stahl , Impedanzspektrometrie
Multiphase flow-enhanced corrosion mechanisms in horizontal pipelines
Tema Archiv | 1998
|Pitting corrosion of steel pipeline in oil-water-gas multiphase flow system
Tema Archiv | 2000
|Liquid holdup in large diameter horizontal multiphase pipelines
Tema Archiv | 1998
|Flow management: steady-state and transient multiphase pipeline simulation
Tema Archiv | 2000
|Pipeline bundles model implemented into a multiphase flow model
Tema Archiv | 2000
|