Electrochemical corrosion behavior,Vickers microhardness,and microstructure of Co–Cr and Ni–Cr dental alloys |
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| Authors: | A El-Bediwi M Saad A A El-Fallal T El-Helaly |
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| Institution: | 1. Department of Physics, Faculty of Science , Mansoura University , Mansoura, Egypt baker_elbediwi@yahoo.com;3. Department of Physics, Faculty of Science , Mansoura University , Mansoura, Egypt;4. Biomaterials Department, Faculty of Dentistry , Mansoura University , Mansoura, Egypt |
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| Abstract: | Electrochemical corrosion behaviors, Vickers microhardness, microstructure, and electrical properties of Magnum H50 (Co=64.5%, Cr=29%, Mo=6.5% ) and Nikkeli–Kromi–Polttosekoitus (Ni=65.2%, Cr=22.5%, Mo=9.5%, X=2.8% Nb, Si, Fe, and Mn) dental alloys have been investigated. The corrosion potential for the Co64.5Cr29Mo6.5 alloy in HCl was higher than that of the Ni65.2Cr22.5Mo9.5X2.8 alloy. The corrosion rate with 0.5 M HCl for the Ni65.2Cr22.5Mo9.5X2.8 alloy was measured as being high and the corrosion resistance as being small as compared with the values for the Co64.5Cr29Mo6.5 alloy. Vickers hardness of the Co64.5Cr29Mo6.5 alloy was higher than that of the Ni65.2Cr22.5Mo9.5X2.8 alloy. Also Vickers hardness values of the used alloys were decreased by increasing indentation load. The thermal conductivity and minimum shear stress values of the used alloys are calculated. |
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| Keywords: | Cr–Co and Ni–Cr alloys corrosion resistance corrosion rate corrosion potential hardness structure |
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