The Effects of a Human Salivary Dialysate upon Ionic Release and Electrochemical Corrosion of a Copper‐Aluminum Alloy

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Abstract
The release of soluble ions and the corrosion rate via polarization resistance methods were investigated for a copper‐aluminum restorative alloy in solutions containing varying concentrations of a human salivary dialysate. Results show that both the released copper concentration and the polarization resistance increase with increases in saliva dialysate concentration. This behavior is explained by the formation of soluble corrosion products with solutions containing dialysate. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), and energy dispersive spectroscopy (EDS) all differentiated between surfaces that were exposed to solutions with and without dialysate. SEM showed corrosion product deposition on surfaces exposed to dialysate‐free solutions. FT‐IR identified the adsorbed film on surfaces exposed to solutions containing dialysate to consist of protein, carbohydrate, and lipid. EDS showed the reduction in peak intensities for chlorine and sulfur on surfaces exposed to solutions containing greater concentrations in saliva dialysate. Hence, even though corrosion rates decrease with increases in dialysate concentration, increased soluble copper concentrations are generated because of their ability to become soluble, most likely by becoming bound to protein.

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