The corrosion of low carbon steel in mixtures of oil and water with various oil/water ratios has been studied using weight loss and potentiodynamic polarisation measurements. The inhibiting behaviour of some alkyl amine ethoxylate derivatives having an average of 14-14.3 moles ethylene oxide per mole and different chain lengths has been investigated. These included: ethoxylated hexyl amine, C6H13NH(CH2CH2O)14-H; ethoxylated decyl amine, C10H21NH(CH2CH2O)14-H; and ethoxylated tetradecyl amine, C14H29NH(CH2CH2O)14-H. The inhibitors were used at concentrations corresponding to 40-100 ppm of the water content in the environment and the effects of storage time at temperatures of 30, 50, and 70 deg C were investigated. The inhibitors provided satisfactory corrosion inhibition which decreased with increasing temperature. The adsorption of the inhibitors on the carbon steel surface was found to obey the Langmuir adsorption isotherm. Thermodynamic activation parameters such as the activation energy E0, enthalpy deltaH0, entropy delta S0, and free energy of activation deltaG0 for the dissolution of carbon steel were calculated. The inhibition efficiency was observed to increased with increasing chain length of the alkyl amine group. The tetradecyl amine ethoxylate, which has the longest chain, was most efficient inhibitor.
Inhibition of steel by alkylamine ethoxylate in petroleum production
Korrosionsinhibierung von Stahl durch Alkylaminethoxylate in der Petrolchemie
British Corrosion Journal ; 36 , 4 ; 261-265
2001
5 Seiten, 5 Bilder, 5 Tabellen, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
unlegierter Stahl , Kohlenstoffstahl , Erdölindustrie , Wasser-in-Öl-Emulsion , Korrosionsinhibierung , organische Stickstoffverbindung , Ethylenoxid , Ableitung (chemische Verbindung) , funktionelle Gruppe , Korrosionsgeschwindigkeit , Temperatureinfluss , Langmuir-Isotherme , Aktivierungsenergie , Polarisationskurve , Gewichtsverlust , Korrosionsinhibitor
Ethoxylate des Rizinusoels als Zusaetze zur Modifizierung der Schmiereigenschaften von Wasser
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