The Effect of Sour Gases and Some Anions on the Corrosion Behavior of Carbon Steel

 

S.A. Salih, A.A. Mazhar, .H. Mahanny*

 

Chemistry Department, Faculty of Sciences, Cairo University, Giza, Egypt.

 

Received 15 January 2003; accepted in revised form 28 July 2004

 

 

Abstract

The effect of the presence of CO₂ and H₂S in the well water used in the petroleum plant  on corrosion of carbon steel has been tested using impedance measurements. Carbon dioxide leads to decrease in the resistivity of the film developed on the metallic surface, while the effect of hydrogen sulfide is less pronounced. Scanning electron micrographs have shown that corrosion products cover only small part of metallic surface in water containing CO₂. Studies under polarization conditions will allow concluding that the dissolved gases in the well water reduce the ability of the film to protect the metal against corrosion. The influence of the oxoanions and halide ions on the corrosion rate of steel has also been analyzed.

 

Keywords: corrosion, sour gases, carbon steel, petroleum plant.

 

 

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* Corresponding author. E-mail address: chemomemo@yahoo.com