Novel nano triphasic bioceramic composite coating on 316L SS by electrophoretic deposition process for enhanced corrosio
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RESEARCH
Novel nano triphasic bioceramic composite coating on 316L SS by electrophoretic deposition process for enhanced corrosion resistance and cell proliferation Ramalingam Manonmani 1 Received: 26 July 2019 / Revised: 17 September 2020 / Accepted: 7 October 2020 # Australian Ceramic Society 2020
Abstract This work mainly focuses on the preparation of novel nano triphasic bioceramic composite (nanoHAP/nanoβ-TCP/ nanoTiO2) (NTPC) coating on 316L Stainless Steel (316L SS) by an electrophoretic deposition process (EPD) followed by sintering in a vacuum atmosphere for 1 h at 800 °C. This type of composite coatings is prepared for the first time owing to the amelioration of the implant by improving the surface properties such as corrosion resistance, osseointegration, and biocompatibility. The NTPC coating on 316L SS were studied by X-ray diffraction, FT-IR spectroscopy, FESEM with EDS, AFM, adhesion strength, and cell culture studies. The electrochemical performance of the NTPC coated 316L SS samples were carried out by open circuit potential (OCP)-time measurements, electrochemical impedance spectroscopic (EIS) and cyclic potentiodynamic polarization (CPP) studies in Hank’s solution. In vitro studies for these coated samples indicate their non-toxic nature in the presence of MC3T3E1 osteoblast cell along with high proliferation. The results showed that the NTPC coatings exhibit superior biocompatibility and enhanced corrosion resistance over 316L SS. Keywords Ceramic coating . Electrophoretic deposition process (EPD) . Sintering . Corrosion resistance . Biocompatibility
Introduction Recently in the biomedical field, research work is mainly interpreted on the improvement of surface preparation on the metallic materials as an implant. One of the revolutionary orthopedic implant materials like 316L SS has a potential application in this field due to its easy availability, lower cost, excellent fabrication properties, biocompatibility, and great strength [1–4]. Long-term performance of metallic implants in human body environment will lead to pitting and crevice corrosion because of releasing Fe, Cr and Ni ions from the metal surface to the surrounding tissues, which still makes a big task to the clinical applications. Thus surface coatings are required on the metal surface which will enhance the bioactivity, osseointegration, and corrosion resistance [5, 6]. Bioceramic coatings on the metal surface can act as a barrier
* Ramalingam Manonmani [email protected] 1
Department of Chemistry, Rajalakshmi Engineering College, Chennai 602105, India
layer between metal and body fluid which could prevent corrosion reaction. Nano Hydroxyapatite [Ca10(PO4)6(OH)2, nanoHAP] is a bioactive bioceramic which is a preferred material for bone substitute [7, 8]. The cell proliferation, osteogenic differentiation and calcium deposition properties desired for hydroxyapatite (HAP) are well documented by in vitro and in vivo studies [9–11]. The problems arise with its slow dissolution rate and poor bioresorbable characteristics
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