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Corrosion Behavior of X-70 Pipe Steel in Crude Oil Environments Depending upon Surface Characteristics

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Abstract

The electrochemical behavior of X70 pipeline steel as a function of surface characteristics was investigated by potentiodynamic Tafel scan, R p/E c, potentiostatic and electrochemical impedance spectroscopy (EIS) in tap water, crude oil extract, and oil-in-water emulsion. The results demonstrated that polished surface was more corrosion resistant than rough surface in tap water due to passivation and oil/water emulsion by uniform surface coverage of the oily phase. Furthermore, the severity level of electrolytes for both surfaces increases from tap water to oil-in-water emulsion and crude oil extract, respectively. The inductive behavior of steel surfaces at high-frequency domain in EIS spectrums was attributed to destabilized structure of electrolyte near the surface. High polarization resistance and admittance values of capacitance for both surfaces in oil/water emulsion depicted greater corrosion resistance independent to surface morphology. The results of R p/E c and potentiostatic were in support for both surfaces in all three electrolytes.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, University of Engineering and Technology, Lahore, 54890, Pakistan

    A. Ahmad, F. Hussain & L. Ali

  2. Department of Metallurgy and Materials Engineering, CEET, University of the Punjab, Lahore, 54590, Pakistan

    F. Hussain, K. M. Deen, R. Ahmad & M. Kamran

  3. Institute of Chemical Engineering and Technology, University of the Punjab, Lahore, 54590, Pakistan

    M. Azam

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  1. A. Ahmad
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  2. F. Hussain
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  3. K. M. Deen
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  4. R. Ahmad
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  5. L. Ali
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  6. M. Kamran
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  7. M. Azam
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Correspondence to K. M. Deen.

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Ahmad, A., Hussain, F., Deen, K.M. et al. Corrosion Behavior of X-70 Pipe Steel in Crude Oil Environments Depending upon Surface Characteristics. Arab J Sci Eng 39, 5393–5404 (2014). https://doi.org/10.1007/s13369-014-1102-y

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  • DOI: https://doi.org/10.1007/s13369-014-1102-y

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