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On the Protection of Carbon Steels from Hydrogen-Sulfide Corrosion with Mixtures of Volatile and Con |
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09.09.2008 г. |
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On the Protection of Carbon Steels from Hydrogen-Sulfide Corrosion with Mixtures of Volatile and Contact Inhibitors Yu. I. Kuznetsov, L. V. Frolova, and E. V. Tomina Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia Received February 18, 2006 Abstract — The effects of volatile (IFKhAN-118) and contact inhibitors (aliphatic primary amine, diphenylguanidine (DPG), and a quaternary ammonium salt (QAS)) and their 1 : 1 and 2 : 1 mixtures on the corrosion and electrochemical behavior of carbon steels in an aqueous electrolyte (0.5% NaCl + CH3COOH (0.25 g/l) + H2S (2 g/l); pH 3.6) were studied. It was found that QAS is most effective among the individual inhibitors. As regards mixed inhibitors, steels were best protected by IFKhAN-118 + QAS (2 : 1) and slightly worse by IFKhAN-118 + Amine (2 : 1). The mixture DPG + VCI was less effective. The protective films of IFKhAN-118 + Amine (2 : 1) exhibited the aftereffect on steel in an atmosphere of moist H2S for 10 days (Z = 97 to 98%); however, a relatively long period of time (about 5 days) was required for the formation of stable adsorbed films in the vapor phase of the inhibitor. PACS numbers: 81.65.Kn DOI: 10.1134/S0033173207020087
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