TLM合金在含蛋白質(zhì)模擬體液中的腐蝕行為Corrosion behavior of TLM alloy in simulated body fluid containing proteins

采用開路腐蝕電位、動態(tài)極化曲線、電化學(xué)交流阻抗譜、掃描電鏡等研究TLM合金在含白蛋白或免疫球蛋白G的PBS溶液(pH=7.4)中的腐蝕行為。結(jié)果表明：在PBS溶液中，該合金具有良好的耐腐蝕性能，合金的腐蝕以點蝕為主；隨浸泡時間的延長合金的腐蝕速率降低。兩種蛋白質(zhì)的單獨或共同加入均可抑制TLM合金在PBS溶液中的腐蝕，其中吸附白蛋白主要通過抑制腐蝕性離子的侵入來實現(xiàn)，而吸附免疫球蛋白G主要通過提高合金表面氧化膜的電阻來實現(xiàn)；在兩種蛋白質(zhì)的共同作用下，合金腐蝕的抑制效果增強。EIS測試結(jié)果表明TLM合金表面的氧化膜可分為內(nèi)層致密層和外層疏松層。

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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