Abstract
This research determined the effect oxidation, as that occurs during porcelain firing, has upon the corrosion parameters of Pd-based ceramic alloys and how it may relate to Pd allergy. The 20 h open circuit potential (OCP), 20 h corrosion rate (Icorr), and anodic polarization (E–i) curves of 11 commercial Pd alloys were measured in a phosphate buffered saline solution. The alloys were divided into the following four groups based upon composition: PdGa(Ag), PdCu, PdAg, and AuPd and tested in both as-cast and oxidized conditions. In both the as-cast and oxidized conditions, the OCP of Ag-containing Pd alloys is significantly lower than non Ag-containing high-Pd alloys. The OCP of all alloys increased after oxidation. With regard to corrosion rate, the Ag-containing alloys showed a decrease in Icorr with oxidation. In contrast, three of the four non Ag-containing high-Pd (≥74 wt%) alloys exhibited a higher Icorr. A comparison of the anodic polarization curves showed only the alloys containing larger amounts (≥16 wt%) of Ag displayed a notable difference between as-cast and oxidized states. Oxidation as required during porcelain-fused-to-metal device preparation alters the electrochemical characteristics of the alloys studied. This alteration may be of importance with regard to their potential for Pd allergy.
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Acknowledgments
The authors gratefully acknowledge the financial support from NIH/NIDCR Grant RO1 DE11402 and the generous supply of alloys from all manufacturers and wish to thank Mr. Michael Higgins of LSUSD for providing editorial suggestions.
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Berzins, D.W., Kawashima, I., Graves, R. et al. Heat treatment effects on electrochemical corrosion parameters of high-Pd alloys. J Mater Sci: Mater Med 19, 335–341 (2008). https://doi.org/10.1007/s10856-006-0054-5
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DOI: https://doi.org/10.1007/s10856-006-0054-5