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Characterization of Corrosion Behavior of Low Carbon Steel Oil Pipelines by Crude Oil

Author Affiliations

  • 1College of Materials Eng., Department of Material Engineering, Babylon University, Iraq
  • 2College of Materials Eng., Department of Material Engineering, Babylon University, Iraq
  • 3College of Materials Eng., Department of Material Engineering, Babylon University, Iraq

Res. J. Recent Sci., Volume 5, Issue (5), Pages 7-13, May,2 (2016)

Abstract

Corrosion and erosion–corrosion in weld joints of petroleum pipelines were investigated by the studying the corrosion of carbon steel in crude oil and water extraction from oil. The experimental work tests of erosion- corrosion were done using special device which was designed according to (G 73) ASTM. The work tests were achieved using traditional weight loss technique to measure weight loss rates in (mpy) Unit, the tests above were done in pumped media and pumped media had constant pressure of 1 bar, flow rate Q = 36 L/min, temperature 25 ºC and pH = 6.56 for erosive-corrosive media. Weight loss method was used in which test specimens of carbon steel, with a known weights, were immersed in the oil for a total exposure time of 60 days and for 10 days in water. Metallographic observations and micro-hardness measurements were also performed on specimens taken from the parent metal, heat affected zone and weld metal. The obtained results clearly indicate a degradation of the mechanical properties of steel welds.

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