【摘 要】
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The electrochemical behaviors of commercially pure titanium (CP Ti) and Co-Cr alloy in Ringer’s solution have been investigated. The results indicate that the
【机 构】
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School of Chemical Engineering , Dalian University of Technology, Dalian 116012, China
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The electrochemical behaviors of commercially pure titanium (CP Ti) and Co-Cr alloy in Ringer’s solution have been investigated. The results indicate that the electric potential of passive region for CP Ti is up to 3000 mV, and its passive current density is 3.078 (A/cm2. The excellent corrosion resistance of CP Ti can be attributed to the formation of TiO2 oxide film. The passive region of Co-Cr alloy is 770 mV, which is narrower than that of CP Ti. However, no hysteresis loops are found in the reverse scanning curves of Cu-Cr alloy. A complex oxide film of Co3O4, Co2O3, and Cr2O3 formed on the surface provides Co-Cr alloy with a stable electrochemistry property. The corrosion rates of the crevice samples increase with the pH value of medium decreasing. The electron probe microanalyzer (EPMA) analysis indicates that Ti in CP Ti and Co, Cr in Co-Cr alloy dissolve in crevice area due to the Sealed-Cell effect.
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