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Article

The Effect of Polytetrafluoroethylene (PTFE) Particles on Microstructural and Tribological Properties of Electroless Ni-P+PTFE Duplex Coatings Developed for Geothermal Applications

1
Mechanical Eng. and Computer Science, Faculty of Industrial Eng., University of Iceland, Hjardarhagi 2-6, Reykjavík, Iceland
2
TWI Ltd., Granta Park, Cambridge CB21 6AL, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Diego Martinez-Martinez
Coatings 2021, 11(6), 670; https://doi.org/10.3390/coatings11060670
Received: 21 April 2021 / Revised: 23 May 2021 / Accepted: 26 May 2021 / Published: 1 June 2021
(This article belongs to the Special Issue Coatings Challenges in Harsh Environments)
The selection of electroless nickel-phosphorus plating (ENP) has been inclined towards their properties and advantages with complex geometry applications. These properties include coating uniformity, low surface roughness, low wettability, high hardness, lubricity, and corrosion- and wear-resistance. Materials used in geothermal environments are exposed to harsh conditions such as high loads, temperature, and corrosive fluids, causing corrosion, scaling, erosion and wear of components. To improve the corrosion- and wear-resistance and anti-scaling properties of materials for geothermal environment, a ENP duplex coating with PTFE nanoparticles was developed and deposited on mild steel within the H2020 EU Geo-Coat project. ENP thin adhesive layer and ENP+PTFE top functional layer form the duplex structure of the coating. The objective of this study was to test the mechanical and tribological properties of the developed ENP-PTFE coatings with varying PTFE content. The microstructural, mechanical and tribological properties of the as-deposited coating with increasing PTFE content in the top functional layer in the order: ENP1, ENP2 and ENP3 were evaluated. The results showed maximum wear protection of the substrates at the lowest load; however, increasing load and sliding cycles increased the wear rates, and 79% increased lubrication was recorded for the ENP2 duplex coating. The wear performance of ENP3 greatly improved with a wear resistance of 8.3 × 104 m/mm3 compared to 6.9 × 104 m/mm3 for ENP2 and 2.1 × 104 m/mm3 for ENP1. The results are applicable in developing low friction, hydrophobic or wear-resistive surfaces for geothermal application. View Full-Text
Keywords: composite coating; electroless-nickel plating; friction; geothermal; geo-coat; wear composite coating; electroless-nickel plating; friction; geothermal; geo-coat; wear
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MDPI and ACS Style

Oppong Boakye, G.; Ormsdóttir, A.M.; Gunnarsson, B.G.; Irukuvarghula, S.; Khan, R.; Karlsdóttir, S.N. The Effect of Polytetrafluoroethylene (PTFE) Particles on Microstructural and Tribological Properties of Electroless Ni-P+PTFE Duplex Coatings Developed for Geothermal Applications. Coatings 2021, 11, 670. https://doi.org/10.3390/coatings11060670

AMA Style

Oppong Boakye G, Ormsdóttir AM, Gunnarsson BG, Irukuvarghula S, Khan R, Karlsdóttir SN. The Effect of Polytetrafluoroethylene (PTFE) Particles on Microstructural and Tribological Properties of Electroless Ni-P+PTFE Duplex Coatings Developed for Geothermal Applications. Coatings. 2021; 11(6):670. https://doi.org/10.3390/coatings11060670

Chicago/Turabian Style

Oppong Boakye, Gifty, Arna M. Ormsdóttir, Baldur G. Gunnarsson, Sandeep Irukuvarghula, Raja Khan, and Sigrún N. Karlsdóttir. 2021. "The Effect of Polytetrafluoroethylene (PTFE) Particles on Microstructural and Tribological Properties of Electroless Ni-P+PTFE Duplex Coatings Developed for Geothermal Applications" Coatings 11, no. 6: 670. https://doi.org/10.3390/coatings11060670

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