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Volume 68, Issue 8

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Volume 70 (2016)

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Influence of caffeine and temperature on corrosion-resistance of CoCrMo alloy

Manuela Romas
  • Faculty of Chemical Engineering and Environmental Protection, Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
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 / Anna Munoz
  • Department of Chemical and Nuclear Engineering, Polytechnic University of Valencia, 50 Camino de Vera, 46022, Valencia, Spain
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 / Daniel Mareci
  • Faculty of Chemical Engineering and Environmental Protection, Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
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 / Carlos Vidal
  • Department of Chemical and Nuclear Engineering, Polytechnic University of Valencia, 50 Camino de Vera, 46022, Valencia, Spain
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 / Silvia Curteanu
  • Faculty of Chemical Engineering and Environmental Protection, Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
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 / Daniel Sutiman
  • Faculty of Chemical Engineering and Environmental Protection, Technical University of Iasi, 73 Prof. dr. doc. D. Mangeron Blvd., 700050, Iasi, Romania
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Published Online: 2014-04-15 | DOI: https://doi.org/10.2478/s11696-014-0549-3

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Abstract

The inhibitory activity of caffeine (1,3,7-trimethyl xanthine) on artificial saliva was studied on a CoCrMo alloy using different electrochemical methods: open circuit potential (OCP), potentiodynamic measurements and electrochemical impedance spectroscopy (EIS). The results show that caffeine produces an inhibitory effect on the anodic currents due to its adsorption on the surface of the alloy. Temperature is another parameter with an influence on corrosion processes, so thermodynamic data were obtained from Arrhenius plots and Langmuir adsorption isotherms. The protective action of caffeine is enhanced at high temperatures at OCP, while for potentiodynamic experiments high temperatures block the inhibitory activity of caffeine and the corrosion rate increases. The process may also be studied by a simulation, determining the functional dependence between OCP, corrosion current density (i corr), corrosion potential (E corr), breakdown potential (E bd) and temperature and amount of caffeine in artificial saliva, for Heraenium® CE. The neural network-based methodology applied in this work provides accurate results, thus proving to be an efficient modelling technique.

Keywords: CoCrMo alloy; caffeine; electrochemical analysis; inhibitory activity; neural networks

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About the article

Published Online: 2014-04-15

Published in Print: 2014-08-01

Citation Information: Chemical Papers, Volume 68, Issue 8, Pages 1066–1078, ISSN (Online) 1336-9075, DOI: https://doi.org/10.2478/s11696-014-0549-3.

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