Many extracted material were used as mouthwash to settle different kinds of oral fungi and bacteria. In this study an extractive of Cyperus rotundus plant E.C.R. which is very active as a mouthwash, was used in concentration range (10-25) ppm in artificial saliva at pH=6.4 and temperature range (288-318) K, to study it’s inhibitory effect on the corrosion of dental amalgam. Potentiostatic and cyclic polarization were used to follow this study. The presence of E.C.R. lead to shift the corrosion potential to the active direction and decreased the corrosion rate to about 98.87%, the inhibition action of E.C.R. resulting from the adsorption of C.R.E. layer between amalgam and saliva as FTIR spectrums shows, where the variety of FTIR adsorption of many group were noticed for the free E.C.R. and adsorbed E.C.R. layer. Thermodynamic of adsorption, corrosion kinetic parameters were also investigated.
Introduction The passivation of iron in aqueous media has been investigated over a number of years. Bartlett and Stephenson and Froment et al. have given a deep insight into the processes of anodic depositon of FeSO4 on iron in H2SO4 solutions. Krstulonic et al. investigated the anodic passivation of Armco iron in a wide range of concentrations of suphuric avid. Alloy elements (Cr, Ni, Mo) are sometimes added to carbon steels to improve their mechanical properties and/or the effects of heat treatment. These metals can increase or decrease corrision resistance depending on the harshness of the environment. The most important alloy of stainless steel is chromium, which induces the formation of a good protective oxide film. According to the literature the alloy must contain at least 1.3 per cent chromium to form a stable passive film. The influence of chromium on the anodic dissolution of Fe‐Cr in sulphuric acid solutions has been the object of several investigations.
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