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Coatings 2016, 6(4), 58; doi:10.3390/coatings6040058

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

1
School of Engineering, Federal University of Rio Grande do Sul, Porto Alegre 90040-060, Brazil
2
TWI Ltd, Cambridge, CB21 6AL, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Robert B. Heimann
Received: 20 September 2016 / Revised: 29 October 2016 / Accepted: 1 November 2016 / Published: 8 November 2016
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Abstract

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. View Full-Text
Keywords: thermally sprayed aluminum (TSA); high temperature; corrosion; hot risers thermally sprayed aluminum (TSA); high temperature; corrosion; hot risers
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Ce, N.; Paul, S. Thermally Sprayed Aluminum Coatings for the Protection of Subsea Risers and Pipelines Carrying Hot Fluids. Coatings 2016, 6, 58.

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