Electrochemical behavior of API-X100 pipeline steel in NS4, near-neutral, and mildly alkaline pH simulated soil solutions

Ibrahim M. Gadala, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The effect of environmental parameters on the electrochemical corrosion of X100 steel in NS4 simulated soil solution is investigated. The parameters examined were pH (4.7-9), purging gas (5% carbon dioxide (CO2)/95% nitrogen (N2), 100% carbon dioxide, and 100% nitrogen), solution temperature (25, 40, and 55°C), bicarbonate (HCO3-) concentration, chloride (Cl-), and sulfate (SO42-). Overall, corrosion rates of the specimens decreased with pH. Sufficient bicarbonate was critical for the passivation of the steel. Higher chloride/sulfate content prevented stable passivation. Impedance results reveal the involvement of adsorption and parallel adsorption-diffusion in near-neutral and mildly alkaline conditions, respectively.

Original languageBritish English
Pages (from-to)45-57
Number of pages13
JournalCorrosion Science
Volume82
DOIs
StatePublished - May 2014

Keywords

  • A. Low alloy steel
  • B. EIS
  • B. Polarization
  • C. Acid corrosion
  • C. Alkaline corrosion

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