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Home > Archives > Volume 20, No 8 (2022) > Article

DOI: 10.14704/nq.2022.20.8.NQ44864

High End Corrosion and Wear Behavior of HA-CNT Coatings on Biomaterials

Mahesh M Sonekar, Walmik S Rathod

Abstract

The present study deals with the critically evaluation of the corrosion and wear behavior of bare and as sprayed reinforced HA-CNT coatings on SS-316L, CoCrMo and Ti6Al4V alloy substrates. Corrosion behavior of all coatings was evaluated by electrochemical polarization test in simulated body fluid as proposed by Kokubo and Takadama. To evaluate wear behavior of all the sprayed pure and reinforced HA-CNT coatings, a wear tester was fabricated as proposed by Morks et al. In case of bare and coated substrates the results of Tafel polarization test have shown that Ti6Al4V alloy has superior corrosion resistance in simulated body fluid solution as compared to SS-316L and CoCrMo alloy. Potentiodynamic curves show that all the alloys show passive behavior but Ti6Al4V has more passive region. The present study also looks at dry and wet unidirectional sliding wear behaviors, as well as the influence of incorporating carbon nanotubes (CNTs) in different weight percent to hydroxyapatite (HA) by plasma spraying on its tribological properties. Crystallinity and volume percent with open porosity were substantially higher in the APS–CNT imposed HA coating than in the control. When compared to pure HA coating, the enhanced hardness ranged from 2.4 to 5.6 GPa, the modulus of elasticity ranged from 105 to 172 GPa, and the fracture toughness from 0.6 to 2.4 MPa.m1/2, with a reduced wear rate of 50.2x10-5 mm3 to 4.2x10- 5 mm3 N -1 m-1 because of the release of graphene layer from CNT surface, which acts as a lubricant. The outcomes showed that adding carbon nanotubes (CNTs) to the coating enhanced tribological behaviour as well as corrosion resistance. These advancements have been credited to nanotubes' exceptional mechanical capabilities, distinctive topological structure, and high degree of chemical stability.

Keywords

Biomaterial, Characterization, Coating, Corrosion, Air Plasma Spray, Wear, Tribology, Polarization

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