Electrochemical behavior of Co-Cr and Ni-Cr dental cast alloys

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• 作者：Viswanathan S. SAJI ; Han-Cheol CHOE
• 关键词：Co-Cr-Mo ; Ni-Cr-Mo ; dental cast alloy ; corrosion ; electrochemical impedance spectroscopy
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2009
• 出版时间：August 2009
• 年：2009
• 卷：19
• 期：4
• 页码：785-790
• 全文大小：1263 K

文摘

The cast structures influencing the electrochemical corrosion behavior of Co-Cr and Ni-Cr dental alloys were studied using potentiodynamic polarization and AC impedance in 0.9 % (mass fraction) NaCl solution at (37±1) °C. The phase and microstructure of the alloys that were fabricated using two different casting methods viz. centrifugal casting and high frequency induction casting, were examined using X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy. The roles of alloying elements and the passive film homogeneity on the corrosion resistance of Co-Cr-Mo and Ni-Cr-Mo dental cast alloys were reviewed. The results of electrochemical study show that the dependence of corrosion resistance on the microstructure associated with the casting methods is marginal. The Co-Cr alloy exhibits more desirable corrosion resistance properties than the Ni-Cr alloy. There is severe preferential dissolution of Ni-rich, Cr and Mo depleted zones in the Ni-Cr alloy.