Effect of localized corrosion on the galvanic corrosion of nitinol and dental alloys

Abdollah Afshar; Mohsen Shirazi; Masoud Rahman; Esmaeil Fakheri

doi:10.1108/00035590911000304

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Anti-Corrosion Methods and Materials

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Effect of localized corrosion on the galvanic corrosion of nitinol and dental alloys

Document Information:
Title:	Effect of localized corrosion on the galvanic corrosion of nitinol and dental alloys
Author(s):	Abdollah Afshar, (Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran), Mohsen Shirazi, (Department of Dentistry, Tehran University of Medical Science, Tehran, Iran), Masoud Rahman, (Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran), Esmaeil Fakheri, (Department of Material Science and Engineering, Sharif University of Technology, Tehran, Iran)
Citation:	Abdollah Afshar, Mohsen Shirazi, Masoud Rahman, Esmaeil Fakheri, (2009) "Effect of localized corrosion on the galvanic corrosion of nitinol and dental alloys", Anti-Corrosion Methods and Materials, Vol. 56 Iss: 6, pp.323 - 329
Keywords:	Alloys, Corrosion, Dentistry, Prosthetic devices
Article type:	Research paper
DOI:	10.1108/00035590911000304 (Permanent URL)
Publisher:	Emerald Group Publishing Limited
Acknowledgements:	Dental Research Center at Tehran University of Medical Science provided part of the financial support for this paper. The authors are grateful to the Material Science Department of Sharif University of Technology for support with the instrumentation.
Abstract:	Purpose – The purpose of this paper is to evaluate the galvanic corrosion of nitinol orthodontic wires with six dental alloys in artificial saliva and consider the effect of initiated localized corrosion and real surfaces of anode and cathode on galvanic current. Design/methodology/approach – Linear polarization and cyclic polarization curves for each alloy in de-aerated Duffo and Castillo's artificial saliva are obtained. Galvanic corrosion investigation is conducted by polarization curve intersection and mixed potential theory methods. In order to verify the initiation of localized corrosion, scanning electron microscopy is used. Findings – Initiation of localized corrosion on the anode increases the galvanic current up to 45 times and therefore considering the effect of localized corrosion on galvanic corrosion is necessary. Placing stainless steel brackets or Aristaloy amalgam in direct contact to nitinol arch wire is not recommended. Originality/value – In order not to underestimate the galvanic corrosion between two alloys, it is recommended to consider the effects of localized corrosion and anode/cathode surface area ratio. In this paper, an electrochemical method for estimating these factors is proposed.