Evaluation of protective coatings for offshore applications. Corrosion and tribocorrosion behavior in synthetic seawater

Coatings have been widely used in the corrosion protection of metallic materials in marine environments. In this work, the corrosion and tribocorrosion behavior of three potential coatings employed in offshore applications has been evaluated. The coatings studied were a Thermally Sprayed Carbide coa...

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Bibliographic Details
Published in:Surface & coatings technology 2018-09, Vol.349, p.1083-1097
Main Authors: López-Ortega, A., Bayón, R., Arana, J.L.
Format: Article
Language:English
Subjects:
Aluminum
Ceramic coatings
Coatings
Coefficient of friction
Corrosion
Corrosion prevention
Corrosion resistance
Corrosion resistant steels
Corrosive wear
Electrochemical impedance spectroscopy
Friction resistance
Marine environment
Offshore
Organic coatings
Platelets (materials)
Protective coatings
Seawater
Substrates
Tribocorrosion
Tribology
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Summary:Coatings have been widely used in the corrosion protection of metallic materials in marine environments. In this work, the corrosion and tribocorrosion behavior of three potential coatings employed in offshore applications has been evaluated. The coatings studied were a Thermally Sprayed Carbide coating with an organic sealant (C1), a Thermally Sprayed Aluminum with an organic sealant (C2), and an epoxydic organic coating reinforced with ceramic platelets (C3). Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization techniques have been employed to assess the corrosion performance of the coatings in synthetic seawater. Furthermore, unidirectional ball-on-disc tribocorrosion tests were performed to study the response of the coatings subjected to simultaneous action of wear and corrosion. The coatings were found to provide to the steel substrate with enhanced corrosion resistance, both in absence and during wear process, and to improve in the tribological properties with lower coefficients of friction in seawater. The coating less affected by sliding in terms of corrosion resistance was C2 coating, which also showed the lowest coefficient of friction. •Three commercial coatings currently used in offshore applications were evaluated.•Corrosion and tribocorrosion tests in synthetic seawater were performed.•The corrosion resistance of the steel substrate was enhanced with the coatings.•The coatings improved the tribological response of the steel in seawater.•The coating that showed the best response was the C2 coating (TSA + organic sealant).
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2018.06.089