This work focuses on the effect of surface contamination prior to coating deposition on the corrosion behaviour of thermal spray aluminium (TSA) coating. TSA coatings (300 μm) were obtained by twin-wire arc spraying AA1050 wires. Substrate surface contamination was performed by immersing grit-blasted S355 steel coupons in artificial seawater for 5, 10 and 20 minutes prior to coating deposition. Measurements of soluble contaminants on steel substrates were made using the Bresle method (ISO8502-6, ISO8502-9). Open circuit potential (OCP) measurements on TSA coatings were carried out at room temperature in synthetic seawater. The corrosion behaviour of the specimens in the 60-day test depended on the amount of surface salt content prior to coating deposition. The data provided useful insight into the corrosion performance which would be beneficial for the offshore industry.

Subject
Coating performance, Steel surfaces, Coatings, Contamination, Salts, Substrates, Aluminum spraying, Steel coupons, Adhesive strength, Substrate surfaces, Rust, Immersion, Soluble salts
Keywords:
Thermal spray coating, surface preparation, soluble salt content
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2023
Association for Materials Protection and Performance (AMPP)
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