关键词: 钴络钼合金, 钛合金, 电偶腐蚀

Abstract: The combination of Co-Cr-Mo alloy and Ti_6Al_4V alloy is widely used as total hip prostheses. The objective of this work is to quantify the possibility of the acceleration of corrosion due to the galvanic effect. Electrochemical tests based on mixed potential and protection potential theories were used to study the galvanic corrosion behavior of coupling these alloys. The results indicated that the galvanic potential between two alloys always was in the passive potential zone of the isolated alloy respectively, and that the galvanic current of the couple is same as the corrosion current of isolated alloy under passive state. The effect of galvanic coupling on corrosion rate is not significant. These results were verified by direct coupling experiments. There is not weight loss of alloys measured by the analysis balance after immersion in saline solution for 45 days. Observation with optical microscope showed no extensive corrosion appearance for two alloys.