Corrosion behaviour of plasma sprayed graphene nanoplatelets reinforced hydroxyapatite composite coatings in simulated body fluid |
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| Affiliation: | 1. Plasma Spray Coating Laboratory, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Patna, Bihta, Bihar, 801103, India;2. Thermal and Fluid Transport Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Patna, Bihta, Bihar, 801103, India;3. Surface Engineering Division, Council of Scientific and Industrial Research-National Aerospace Laboratories, Bangalore, Karnataka, 560017, India;1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Patna, Bihta, Patna, Bihar 801103, India;2. School of Engineering, Indian Institute of Technology Mandi, Kamand, Himachal Pradesh 175005, India;1. Plasma Spray Coating Laboratory, Indian Institute of Technology Patna, Bihar 801106, India;2. Institut für Werkstofftechnik (Materials Engineering), Universität Kassel, 34125 Kassel, Germany |
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| Abstract: | Hydroxyapatite (HA) coatings, reinforced with varied concentration (0–2 wt%) of Graphene nanoplatelets (GNPs) have been deposited on titanium alloys (Ti–6Al–4V) substrate using atmospheric plasma spraying. Present work studies the effect of GNP concentration on the electrochemical behaviour of the HA coatings in simulated body fluid (SBF). The HA coating exhibited 15% porosity, whereas reinforcement of 1 wt% GNPs in HA (HA-1G) shows 13% porosity, further addition of 2 wt% GNPs in HA reduced the porosity to 10%. Reduction in porosity was achieved as GNPs easily accessed the inter-lamellae to fill the gaps at inter splat region and minimized the occurrence of post-plasma spray defects such as porosity, voids, microcracks etc. These consequences nextward resulted in the significant enhancement in corrosion resistance of the matrix. HA-1G displayed a significant reduction by 67% in the corrosion rate in SBF solution, while this reduction came to 87% for HA-2G coatings. Randomly oriented wrinkles in the GNPs after corrosion process and their hydrophobic nature effectively hindered the SBF infiltration into the coating and resisted their movement towards the underlying substrate. This in turn improved the overall corrosion resistance of the system. |
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| Keywords: | Plasma spraying Hydroxyapatite Graphene nanoplatelets Corrosion |
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