Ni-Doped ZnO-Chitin Composites for Anti-Corrosive Coating on Zn Alloy in Simulated Body Fluid Solution

Abstract

Application of biopolymers as biomaterials has greatly impacted the development of modern medicine. Specifically, biopolymers have a lot of applications in biomedical field because of its capability to tie through bone and soft tissues. Present study shows Zn alloy improves biocompatibility and the corrosion resistance ability when it is coated with Chitin-Ni-doped ZnO biocomposite material. Here, the electrochemical corrosion behavior of coated Zn alloy is examined in Simulated body fluid (SBF) solution and the concentration of Ni doped ZnO is investigated in Chitin-Ni doped ZnO biocomposites. To study the structural properties and to the presence of different Functional groups in coated materials X-ray diffraction (XRD) and Fourier transform infrared spectroscopy with KBr pellets (KBr-FTIR) techniques were used. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDAX) techniques were used to understand the surface morphology with elemental analysis of Chitin-Ni doped ZnO biocomposite material. The chemical composition of Chitin and Ni/ZnO in Chitin-Ni doped ZnO biocomposites were examined by XPS studies. AFM and the contact angle measurement shows that Chitin-Ni doped ZnO biocomposites coating improves anticorrosion performance by enhancing the surface roughness and hydrophilic nature of Zn alloy. The Electrochemical analysis of Zn alloy was performed to evaluate corrosion resistance in SBF solution for 24 h. It shows a decreasing trend in the current density with increase in corrosion resistance and the corrosion potential which shifts towards the positive direction from potentiodynamic polarization studies. Electrochemical impedance spectroscopy (EIS) study reveals a good capacitor behavior and high resistance value for Chitin-Ni doped ZnO-coated Zn alloy substrate.