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Corrosion inhibition of steel in seawater through surface phosphate formed from oil

DOI: 10.1016/j.surfcoat.2021.126970 DOI Help

Authors: Jeffrey Poon (University of Cambridge) , David C. Madden (University of Cambridge) , Rebecca J. L. Welbourn (ISIS Neutron and Muon Source) , Finian J. Allen (University of Cambridge) , Fahmida Khan (University of Cambridge) , Hans Sonke (Shell Global Research Centre) , Stuart M. Clarke (University of Cambridge)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Surface And Coatings Technology

State: Published (Approved)
Published: February 2021
Diamond Proposal Number(s): 17044

Abstract: Bis(2-ethylhexyl) phosphate (BEHP) was exposed to carbon steel surfaces from dry and water-saturated dodecane. The resulting changes to the surfaces were characterised using spectroscopic techniques (energy dispersive X-ray (EDX), X-ray photoelectron (XPS), and far-infrared reflection absorption (RAIRS) spectroscopies) and polarised neutron reflectometry (PNR). Although there was no observable affinity of BEHP to the steel surface in dry solvent, a layer of rough iron (III) phosphate formed in water-saturated dodecane. The phosphate-reacted steel surface showed some resistance to corrosion by seawater, suggesting the formation of a cohesive barrier against corrosive species. The results support the use of BEHP as an anti-corrosion additive and a viable phosphating agent for steel surfaces.

Journal Keywords: phosphate; steel; corrosion; water exposure; surface analysis; neutron reflectometry

Subject Areas: Chemistry, Materials

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Other Facilities: POLREF at ISIS

Discipline Tags:

Corrosion Engineering & Technology Materials Engineering & Processes Material Sciences Chemistry

Technical Tags:

Spectroscopy Infrared Spectroscopy