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Thermally Sprayed Aluminum Coatings for the Protection of Subsea Risers and Pipelines Carrying Hot Fluids

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journal contribution
posted on 12.09.2019, 15:34 by Nataly Ce, Shiladitya Paul
This paper reports the effect of boiling synthetic seawater on the performance of damaged Thermally Sprayed Aluminum (TSA) on carbon steel. Small defects (4% of the sample’s geometric surface area) were drilled, exposing the steel, and the performance of the coating was analyzed for corrosion potential for different exposure times (2 h, 335 h, and 5000 h). The samples were monitored using linear polarization resistance (LPR) in order to obtain their corrosion rate. Scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) were used for post-test characterization. The results showed that a protective layer of Mg(OH)2 formed in the damaged area, which protected the underlying steel. Additionally, no coating detachment from the steel near the defect region was observed. The corrosion rate was found to be 0.010–0.015 mm/year after 5000 h in boiling synthetic seawater.

Funding

The work was funded by TWI. Nataly Araujo Ce would like to thank CNPQ and BG for the PhD scholarship. The authors also acknowledge the contribution of TWI staff, especially Andrew Tabecki, Mike Bennett and Sheila Stevens.

History

Citation

Coatings, 2016, 6(4), 58

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

VoR (Version of Record)

Published in

Coatings

Publisher

MDPI

issn

2079-6412

Acceptance date

01/11/2016

Copyright date

2016

Available date

12/09/2019

Publisher version

https://www.mdpi.com/2079-6412/6/4/58

Language

en