Robust composite coating with superior corrosion inhibitory performance on surgical grade 316L stainless steel in Ringer
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ORIGINAL RESEARCH
Robust composite coating with superior corrosion inhibitory performance on surgical grade 316L stainless steel in Ringer solution Kodimani Vinothkumar1 · Manivasagam Nivetha1 · Mathur Gopalakrishnan Sethuraman1 Received: 16 March 2020 / Accepted: 25 July 2020 © Iran Polymer and Petrochemical Institute 2020
Abstract 316L stainless steel (SS) is used as an orthopedic implant biomaterial due to its properties such as superior tensile strength, fatigue strength, and fracture toughness. Although it possesses such remarkable properties, it is corroded in aggressive biofluids. Hence, with a view to combat corrosion of surgical grade 316L SS, 3-amino-5-mercapto-1,2,4-triazole (AMTa) and its Na-montmorillonite (Na-MMT) K10 clay composite were electropolymerized over its surface and its anti-corrosion performance was evaluated. The results of electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization studies (PDS) revealed the enhanced protective behavior of the composite compared to the polymer which was guaranteed by the results of chronoamperometric studies and atomic absorption spectroscopy. The functionalities of electrochemically synthesized p-AMTa and its Na-MMT composite films were characterized by Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy results which supported the formation of the polymer by NH–NH and S–S linkages. The surface morphological studies of a bare and film-deposited 316L SS confirmed the protective layer formed over the SS surface. Further, the effect of concentration of monomer and Na-MMT on corrosion inhibition was also studied. Anticorrosive performance of the polymer and Na-MMT composite studied after 7 days of immersion in the Ringer solution revealed that composite-coated 316L SS could retain its protective performance. Keywords 316L stainless steel · Corrosion · Electrosynthesis · 3-Amino-5-mercapto-1,2,4-triazole · Na-montmorillonite clay
Introduction Metals and alloys have been extensively used as prosthetic biomedical devices in the human body for restoration of anatomical structures in view of their inherent mechanical properties. These biomedical devices are usually made of titanium or titanium alloys or cobalt–chromium alloys or austenitic stainless steel [1]. Among them, austenitic stainless steel, especially 316L grade is commonly used as a prosthetic biomedical material owing to its reasonable corrosion resistance, relatively low cost, outstanding fabrication properties, and broader availability [2]. Although it shows such remarkable properties, it is prone to localized corrosion in chloride and reduced sulfur environments [3]. * Mathur Gopalakrishnan Sethuraman [email protected] 1
Department of Chemistry, The Gandhigram Rural Institute – Deemed to be University, Gandhigram, Dindigul District, Tamil Nadu 624 302, India
It is a well-known fact that the concentration of chloride ions in human body serum and interstitial fluid is 113 and 117 mmol/L, respectively, which is equivalent to one-third of the concentration
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