Corrosion of simulated weld HAZ of API X-80 pipeline steel

Farzad Mohammadi, Faysal Fayez Eliyan, Akram Alfantazi

Research output: Contribution to journalArticlepeer-review

135 Scopus citations

Abstract

Four peak temperatures and two cooling rates were used in a Gleeble thermomechanical processing machine to simulate weld HAZ of API X-80 pipeline steel. Bainitic microstructures were observed at both 30 and 100 °C/s cooling rates. Bainite favoured higher passive current densities in alkaline solutions. The lowest peak temperature, 770 °C, produced the highest martensite-retained austenite (M-A) phase in the microstructure. Presence of M-A phases in the microstructure extended the passive region to higher potentials in alkaline solutions. Corrosion current density of the as-received sample was higher in acidic solutions and lower in alkaline solutions compared to the heat-treated ones.

Original languageBritish English
Pages (from-to)323-333
Number of pages11
JournalCorrosion Science
Volume63
DOIs
StatePublished - Oct 2012

Keywords

  • A. Low alloy steel
  • B. Polarisation
  • C. Acid corrosion
  • C. Alkaline corrosion
  • C. Welding

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