人工模拟体液中pH值对离子注N人体医用合金腐蚀行为的影响

采用电化学测试技术研究了在人工模拟体液中pH值变化对离子注N人体用SUS316L不锈钢,Co-Cr合金，工业纯Ti和Ti-6Al-4V合金腐蚀行为的影响。结果表明，随着pH值的降低，试样的腐蚀电位负移，SUS316L不锈钢和Co-Cr合金的点蚀电位与缝隙腐蚀电位降低，使材料发生局部腐蚀的敏感性提高，工业纯Ti和Ti-6Al-4V合金的腐蚀电流密度增大，提高离子释放速度，加大对人体的潜在生理危害。

Influence of pH Value on Corrosion Behavior of N-ion Implanted Surgery Medical Materials in Artificial Body Fluid

The influence of pH value on corrosion behavior of N ion implanted SUS316L stainless steel, Co Cr alloy, CPTi and Ti 6Al 4V alloy surgery medical materials has been investigated in Hank's solution using electrochemical technology. Experimental results indicate that corrosion potentials of specimens decline, and E b and crevice corrosion potentials of SUS316L stainless steel and Co Cr alloy also decline with decreasing pH value, which results in an increase of the sensibility of local corrosion. The corrosion rates of CPTi and Ti 6Al 4V alloy also increase in Hank's solution with much lower pH value.