Sintering temperature effects on nano triphasic bioceramic composite coated 316L SS for corrosion resistance, adhesion s
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Sintering temperature effects on nano triphasic bioceramic composite coated 316L SS for corrosion resistance, adhesion strength, and cell proliferation on implants R. Manonmani1,a) T.M. Sridhar2 1
Department of Chemistry, Rajalakshmi Engineering College, Chennai 602105, India Department of Analytical Chemistry, University of Madras, Chennai 600025, India a) Address all correspondence to this author. e-mail: [email protected] 2
Received: 6 August 2019; accepted: 10 January 2020
The present work is mainly accentuated to improve corrosion resistance performance, adhesion strength, biocompatibility, and cell proliferation of metallic implants. Novel nano triphasic bioceramic composite coating was achieved on 316L SS by the electrophoretic deposition process followed by vacuum sintering. The optimized potential for composite coating on 316L SS was found to be 30 V and 1 min. All the composite coated samples were sintered in a vacuum furnace at various sintering temperature starting from 700 °C to 1000 °C for 1 h. The coated samples were thoroughly characterized in terms of crystallinity, morphology, and surface roughness by XRD, FESEM with EDX, and profilometer studies, respectively. In addition, the coated samples were mechanically characterized using a tap adhesion and Vickers microhardness test. Corrosion performance of the coated sample was characterized by electrochemical studies in Hank’s solution. The in vitro cytotoxicity studies for cell viability and cell proliferation was carried out using MC3T3-E1 osteoblast cells. These studies revealed an enhanced cell attachment and proliferation on the composite-coated sample than the uncoated sample, which controlled the discharge of metal ions from the metal surface into the biological system.
Introduction Metallic implant materials and alloys are widely used for loadbearing applications because of excellent corrosion resistance and mechanical strength [1, 2]. Although metals show high strength and toughness, they are subjected to electrochemical and chemical degradation. However, the metals implanted in the human body undergo degradation. In orthopedic application along with various available biomaterials, metals are incredibly important. They narrowed an option of clinically serviceable metals and alloys to mostly austenitic stainless steels, titanium, cobalt-chromium, and its alloys [3, 4, 5, 6]. They play a major role in fulfilling every significant issue that arises in implant applications. 316L stainless steel (316L SS) implant highly attractive in the medical field because of biocompatibility, excellent fabrication properties, high corrosion resistance, broader availability, and low cost. The clinical experience has shown that they are prone to pitting, crevice,
ª Materials Research Society 2020
and localized corrosion in the human body, which causes the release of metal ions into the tissues surrounding the implants [7, 8]. To avoid this implantation problem, various surface modification techniques have been developed. The improvement of osseointegrat
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