TLM合金在含蛋白质模拟体液中的腐蚀行为Corrosion behavior of TLM alloy in simulated body fluid containing proteins

采用开路腐蚀电位、动态极化曲线、电化学交流阻抗谱、扫描电镜等研究TLM合金在含白蛋白或免疫球蛋白G的PBS溶液(pH=7.4)中的腐蚀行为。结果表明：在PBS溶液中，该合金具有良好的耐腐蚀性能，合金的腐蚀以点蚀为主；随浸泡时间的延长合金的腐蚀速率降低。两种蛋白质的单独或共同加入均可抑制TLM合金在PBS溶液中的腐蚀，其中吸附白蛋白主要通过抑制腐蚀性离子的侵入来实现，而吸附免疫球蛋白G主要通过提高合金表面氧化膜的电阻来实现；在两种蛋白质的共同作用下，合金腐蚀的抑制效果增强。EIS测试结果表明TLM合金表面的氧化膜可分为内层致密层和外层疏松层。

The corrosion behavior of TLM alloy was investigated by open circuit potential, potentiodynamic polarization, electrochemical impedance spectra and scanning electronic microscope in phosphate buffer saline (PBS) solution (pH=7.4) containing albumin or immunoglobulin G (IgG). The results show that the alloy possesses excellent corrosion resistance to the PBS solution, and mainly suffers pitting corrosion attack. The corrosion rate decreases with increasing the immersion period in PBS solution. Single or combined addition of two kinds of protein can both inhibit the corrosion of the alloy, which is attributed to the blocking effect on the penetration of aggressive ions for albumin, but for IgG which is achieved through the improvement of the resistance of TLM alloy surface oxide film. When two kinds of protein are used together, the inhibitive effect is greater than that by single addition of albumin or IgG. The EIS results indicate that the passive film consists of an inner barrier and an out porous layer.

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