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Galvanic corrosion of nitinol under deaerated and aerated conditions
Author(s) -
Pound Bruce G.
Publication year - 2016
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33474
Subject(s) - corrosion , galvanic corrosion , materials science , galvanic cell , metallurgy , dissolution , oxide , aeration , anode , galvanic anode , chloride , cathodic protection , electrode , chemistry , organic chemistry
Various studies have examined the corrosion rate of nitinol generally under deaerated conditions. Likewise, galvanic corrosion studies have typically involved deaerated solutions. This work addressed the effect of galvanic coupling on the corrosion current of electropolished nitinol in phosphate buffered saline and 0.9% sodium chloride under dearated and aerated conditions for times up to 24 h. Tests were performed on nitinol alone and coupled with MP35N in both the mechanically polished and passivated conditions. Aeration and galvanic coupling were found to have relatively little effect, indicating that the corrosion current is controlled by the anodic reaction. The current can be attributed entirely to Ni 2+ dissolution, which appears to be governed by solid‐state mass transport of Ni 2+ through the passive oxide film. Because corrosion of EP nitinol is controlled by the anodic reaction, contact between EP nitinol and MP35N or other biomedical Co‐Cr alloys is unlikely to result in significant galvanic effects in vivo . © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1322–1327, 2016.