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Corrosion behaviour of an indigenous Ag‐Sn‐Cu cast dental alloy in artificial saliva
Author(s) -
Patro T. K.,
Singh B. P.,
Singh V.
Publication year - 1998
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1998.00217.x
Subject(s) - alloy , passivation , corrosion , materials science , metallurgy , saliva , nuclear chemistry , chemistry , composite material , biochemistry , layer (electronics)
The corrosion behaviour of an indigenous cast alloy of Ag‐Sn‐Cu, developed for crown and bridge prostheses, was studied in artificial saliva, with and without the addition of 0·1mlactic acid, using a potentiostatic technique, and compared with that of the standard cast alloy of Ag‐Pd (Ney 76). The values of different parameters such as corrosion potential and corrosion current density were determined for the indigenous alloy of Ag‐Sn‐Cu and the Ag‐Pd alloy. The rate of corrosion of the indigenous alloy was found to be relatively higher than that of the Ag‐Pd alloy up to an applied potential of + 400 mV. However, while the indigenous alloy showed a distinct tendency for passivation below + 200 mV at the current level of 0·5 mA/cm 2 in the artificial saliva (pH 5·7) at 37 °C, no such tendency for passivation was shown by the Ag‐Pd alloy even up to + 400 mV. The tendency for passivation by the indigenous Ag‐Sn‐Cu alloy, however, was not shown in the artificial saliva in the presence of 0·1mlactic acid (pH. 2·7) at 37 °C. Minor variation was observed in the corrosion behaviour of the indigenous Ag‐Sn‐Cu alloys of different grades prepared by alloying elements of varying purity.