Corrosion Behavior of Buried Carbon Steel Pipeline In Iraqi Soil in Different Sodium Chloride Concentrations
Journal Title: American journal of Engineering Research - Year 2018, Vol 7, Issue 6
Abstract
In this work, external corrosion behavior of oil pipeline was evaluated using potentiodynamic polarization curves. The corroding metal was carbon steel. To estimate corrosion by potential and current density of carbon steel, different concentrations of sodium chloride were chosen and prepared in the laboratory to simulate external condition of buried carbon steel pipeline in Iraqi soil. NaCl concentration in Iraqi soil was tested by taking samples from different areas, from north to south of Iraq. pH of soil samples were ranged from acidic to basic. Temperature of prepared solutions was constant at 350 C which Iraq environment is hot most of the year. Carbon steel coupon of (ASTM A179-84A) type was used as the studied metal. Potentiodynamic polarization curves, of potential vs. log current density, were obtained using M Lab Multi-Channel Potentiostat/Galvanostat. The results revealed the behavior of carbon steel in different chloride concentrations, pH, and relativelyhightemperature. The rate of corrosion increases with the increase in chloride concentration, and decreases with acidity decrease. Triple relationship between these parameters was studied.
Authors and Affiliations
M. Sc. Dalia Mohammed Almonderi
Keywords
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