This study investigates the formation of ZnNi/Cr2O3-TiO2-CuO-SiO2/PTFE composite ceramic coatings by atmospheric plasma spraying and assesses their ability to improve the corrosion, friction, and wear performance of reciprocating parts. The as-sprayed coatings were examined then subjected to a series of tests to evaluate corrosion and fouling resistance. Reciprocating parts that had been coated were relatively intact after 5000 h in a realistic ocean environment. Cyclical changes in coating weights were found to be influenced by the dissolution of oxide films and the accumulation of secondary products. PTFE proved to be an effective sealing agent, reducing mass loss and porosity by approximately 30%.

atmospheric plasma spraying, composite ceramic coating, corrosion resistance, fouling resistance, PTFE sealing, reciprocating components
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2016
DVS Media GmbH
Topics
Cavitation corrosion Plasma spray coating Corrosion potential Porosity Salt spray testing Polytetrafluoroethylene composites
Issue Section:
Thermal Spray Powders, Wires, and Suspensions
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