Exploring a phosphate system for corrosion prevention in CO2 pipelines

M. F. Morks, P. Corrigan, N. F. Fahim, N. Birbilis, I S Cole

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

The internal corrosion of carbon dioxide (CO2) pipelines is an undesirable phenomenon in CO2 capture and storage. Internal corrosion protection systems in cases where the liquid stream is acidified by in-situ speciation of carbonic acid (and other impurities) are in high demand in the hydrocarbon and chemical process industries to reduce the high cost of maintenance. In this context, we explore the feasibility of Mn-Mg based zinc phosphate coatings as a treatment for the interior surface of steel pipelines in acidified environments. The concept behind phosphate protection is to build a solid phosphate layer with micron grain size (1-5 μm) and low porosity on the interior surface of pipelines. The phosphate microstructure may potentially host different inhibitors and may be sealed with long carbon chain species that increase the anti-corrosion performance of a phosphate layer. In this work, the addition of sodium orthovanadate (Na3VO4) in a modified phosphate bath led to a significant change in the microstructure of the phosphate coating. Electrochemical tests (polarisation and electrochemical impedance spectroscopy) were performed in chlorinated de-ionised water at pH 2-4.

Original languageEnglish
Title of host publicationAnnual Conference of the Australasian Corrosion Association 2012
Subtitle of host publicationMelbourne, Victoria, Australia; 11-14 November 2012
Place of PublicationKerrimuir VIC Australia
PublisherAustralasian Corrosion Association (ACA)
Pages291-299
Number of pages9
ISBN (Print)9781622769698
Publication statusPublished - 2012
EventAustralasian Corrosion Association (ACA) Conference 2012: Corrosion and Prevention - Crown Conference Centre, Melbourne, Australia
Duration: 11 Nov 201214 Nov 2012

Conference

ConferenceAustralasian Corrosion Association (ACA) Conference 2012
Abbreviated titleCP 2012
Country/TerritoryAustralia
CityMelbourne
Period11/11/1214/11/12
OtherCorrosion Management for a Sustainable World: Transport, Energy, Mining, Life Extension and Modelling

Keywords

  • Co2 corrosion
  • Pipelines
  • Vanadate inhibitor
  • Zinc phosphate

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