为研究含铜宫内节育器（Cu IUD）的铜离子释放行为，在体外试验条件下考察了模拟宫腔液中添加生化组份人血清白蛋白对铜腐蚀行为的影响。极化电阻测试的结果表明，在所研究的pH和氧分压范围内，白蛋白总是使铜的腐蚀速度相对于无白蛋白的情况有所增大。同时发现，中性条件下（pH=7）当白蛋白的浓度较小时（<1g/L),铜的腐蚀速度随白蛋白浓度的增大而增大;当白蛋白浓度较大(>1g/L)时,铜的腐蚀速度参白蛋白浓度的增大反而有所减小并趋于一稳定值.腐蚀试验后铜试样表面XRD分析和表面膜阴极还原等试验结果显示,在中性条件下(pH=7),白蛋白浓度较小(<1g/L)时,铜表面上有明显数量的Cu2O生成,当其浓度较大(>1g/L)时几乎没有Cu2O生成.白蛋白的存在促进了铜腐蚀的阳极过程.
For more knowledge of the performance of copper-bearing intrauterine devices (CuIUD), corrosion behavior of copper was examined in a simulated utcrine fluid containing serum albumin. Electrochemical polarization resistance measurements indicated that over the range of pH and desolved oxygen concentration under study the presence of serum albumin always increases the corrosion rate and the latter fluctuates according to the albumin levels. Its addition initially increased the corrosion rate, but the higher albumin level resulted in somewhat suppression of copper corrosion. Both X-Ray Diffraction(XRD0 analysis and cathodic reduction of surface film showed that, at a lower albumin concentration (<1g/L),only cuprous oxide was formed on the copper-substrated surface; however, a higher albumin concentation(>1g/L)suppressed the formation of cuprous oxide. The presence of albumin shifted the corrosion potential of copper towards negative. It could be inferred that the albumin accelerated the anodic process of copper and hence enhanced its corrosion.
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