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Thu, 15 April, 2021

Geo-Drill is due to present a paper on "Microstructural characterization and Corrosion-wear properties of Graphene oxide/ Polytetrafluoroethylene Coatings for Geothermal Drilling Applications" on Monday, April 19, 2021 5:00 PM to 5:25 PM (GMT) at the NACE 2021 conference.


Gifty Oppong Boakye (UoI), Danyil Kovalov (UoI), Erlend Oddvin Straume (UoI), Beatrice Alonso Rodriguez (Graphenea, SA), Sigrún Nanna Karlsdóttir (UoI).


Polymeric coatings are exploited by adding reinforcements to maximize its industrial performance. In this work, the idea of reinforcement is to tailor the matrix's wide-range performance to a specific desired property to prevent drilling failures in the aggressive geothermal environment. A polyphenylene sulfide-polytetrafluoroethylene (PPS-PTFE) matrix was modified with graphene oxide (GO) to improve the mechanical properties, corrosion and wear resistance, to provide coatings for drilling components for high-temperature geothermal well environment. Electrochemical test in a 3.5wt% NaCl solution and a pin-on-disc sliding test were performed to determine the corrosion and wear resistance of the novel coatings. After the test, the addition of GO drastically reduced the friction coefficient and wear rate but increased the roughness and hydrophobic properties of the coatings. Using the microscopic analysis, localized corrosion was detected in all the coatings with corrosion currents in nA. The results indicated the best performance for low GO addition with improvement in surface properties, wear and corrosion resistance in the simulated test conditions.