Indian Journal of Chemical Technology

Open Access Open Access  Restricted Access Subscription Access

Studies on Characteristics and Corrosion Behaviour of Chitosan/Eudragit RS100 Bilayer Film Coated Ti-6Al-4V


Affiliations
1 Department of Studies in Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India
2 Department of Studies in Industrial Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India
3 Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576 104, Karnataka, India
4 Department of Chemistry, Srinivas University, Institute of Engineering and Technology, Mukka 574 146, Karnataka, India
5 Department of Chemistry, M. S. Ramaiah College of Art, Science and Commerce, MSR Nagar, Bangalore 560 054, Karnataka, India
6 Department of Applied Botany, Mangalore University, Mangalagangothri 574 199, Karnataka, India
 

In the present study, implant material Ti-6Al-4V has been coated with eudragit (EU) and chitosan (CH) polymers to enhance surface properties. The deposition of polymer coating has covered the surface cracks to a significant level and the fact has been confirmed by FE-SEM coupled with EDAX wherein the atomic percentage of Ti (99.90%) in non-coated surface has been decreased markedly to 0.42% after coating. Scratch resistance and adhesion power of bilayer coating has been increased as indicated by the higher critical loads Lc1 (16.71 N), Lc2 (17.56 N), Lc3 (17.96 N) when a progressive load of 1 N to 20 N is applied over the coated surface. Further, Electrochemical impedance spectroscopy (EIS) and potentiodynamic-polarization studies have shown that the value of polarization resistance is inversely proportional to the corrosion rate. Thus decrease in the corrosion rate from 107.5×10-2 (mm year-1) for the non-coated alloy to 2.88×10-2 (mm year-1) for CH/EU coating demonstrated that coating enhanced the corrosion resistance of the alloy in the physiological condition. The in vitro antibacterial test conducted against S. aureus, B. subtilis, P. vulgaris and P. auregenosa has shown a significant inhibition zone of 9 mm, 6 mm, 7 mm and 10 mm, respectively, thus indicating the possible application of the polymeric coating material on the dental implants.

Keywords

Dental Implant, Artificial Saliva, Scratch Test, Potentiodynamic Polarization, Critical Load.
User
Notifications
Font Size


  • Studies on Characteristics and Corrosion Behaviour of Chitosan/Eudragit RS100 Bilayer Film Coated Ti-6Al-4V

Abstract Views: 202  |  PDF Views: 118

Authors

K Shreevani
Department of Studies in Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India
B Narayana
Department of Studies in Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India
B. K. Sarojini
Department of Studies in Industrial Chemistry, Mangalore University, Mangalagangothri 574 199, Karnataka, India
A Ganesha
Department of Mechanical and Industrial Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576 104, Karnataka, India
B M Praveen
Department of Chemistry, Srinivas University, Institute of Engineering and Technology, Mukka 574 146, Karnataka, India
Bharath K Devendra
Department of Chemistry, M. S. Ramaiah College of Art, Science and Commerce, MSR Nagar, Bangalore 560 054, Karnataka, India
Krishnakumar G
Department of Applied Botany, Mangalore University, Mangalagangothri 574 199, Karnataka, India
Sushmitha C H
Department of Applied Botany, Mangalore University, Mangalagangothri 574 199, Karnataka, India

Abstract


In the present study, implant material Ti-6Al-4V has been coated with eudragit (EU) and chitosan (CH) polymers to enhance surface properties. The deposition of polymer coating has covered the surface cracks to a significant level and the fact has been confirmed by FE-SEM coupled with EDAX wherein the atomic percentage of Ti (99.90%) in non-coated surface has been decreased markedly to 0.42% after coating. Scratch resistance and adhesion power of bilayer coating has been increased as indicated by the higher critical loads Lc1 (16.71 N), Lc2 (17.56 N), Lc3 (17.96 N) when a progressive load of 1 N to 20 N is applied over the coated surface. Further, Electrochemical impedance spectroscopy (EIS) and potentiodynamic-polarization studies have shown that the value of polarization resistance is inversely proportional to the corrosion rate. Thus decrease in the corrosion rate from 107.5×10-2 (mm year-1) for the non-coated alloy to 2.88×10-2 (mm year-1) for CH/EU coating demonstrated that coating enhanced the corrosion resistance of the alloy in the physiological condition. The in vitro antibacterial test conducted against S. aureus, B. subtilis, P. vulgaris and P. auregenosa has shown a significant inhibition zone of 9 mm, 6 mm, 7 mm and 10 mm, respectively, thus indicating the possible application of the polymeric coating material on the dental implants.

Keywords


Dental Implant, Artificial Saliva, Scratch Test, Potentiodynamic Polarization, Critical Load.

References