Effect of proteins and pH on fretting corrosion and metal ion release.
Effect of proteins and pH on fretting corrosion and metal ion release.
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DOI：
10.1002/jbm.820220204
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发表时间：
1988-02
期刊：
影响因子：
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通讯作者：
Katharine Merritt;Stanley A. Brown
中科院分区：
文献类型：
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作者：
Katharine Merritt;Stanley A. Brown
本研究的目的是确定蛋白质和蛋白质电荷对不锈钢腐蚀的影响。作为两性离子，蛋白质在其等电点（pI）的酸性溶液中具有正电荷，在pI的碱性溶液中具有负电荷。通过失重和金属离子释放测定不锈钢板和螺钉的微动腐蚀速率，在生理盐水和蛋白质溶液中进行了研究，pH值调整为3，5和8。pH值的改变并不影响盐溶液中的腐蚀速率。然而，白蛋白溶液中pH值的改变确实会影响腐蚀速率。在蛋白质溶液的酸性等电点的存在下，带正电荷的白蛋白没有改变腐蚀速率相比，在盐水中。然而，带负电荷的蛋白质的存在下，在解决方案的基础上，他们的等电点减少的腐蚀量。因此，蛋白质对微动腐蚀的影响取决于蛋白质上的电荷。当镍的释放相比，铬的释放，它表明，释放成比例的合金成分时，在盐水中发生微动腐蚀。白蛋白和丙种球蛋白溶液中的镍/铬比相对于预测值增加，表明镍在蛋白质溶液中优先释放。
The objectives of this study were to determine the effect of proteins and protein charge on the corrosion of stainless steel. As Zwitter ions, proteins have a positive charge in solutions acidic to their isoelectric point (pI) and a negative charge in solutions basic to the pI. Fretting corrosion rates of stainless-steel plates and screws as determined by weight loss and metal ion release were studied in saline and protein solutions with the pH adjusted to 3, 5, and 8. Alterations in pH did not affect the corrosion rate in saline solutions. However, alterations of the pH in albumin solutions did affect the corrosion rate. In protein solutions acidic to the isoelectric point the presence of the positively charged albumin did not alter the corrosion rates as compared to that in saline. However, the presence of negatively charged proteins in solutions basic to their isoelectric points decreased the amount of corrosion. Thus, the effect of proteins on fretting corrosion is dependent on the charge on the protein. When the release of nickel was compared to the release of chromium, it was shown that the release was in proportion to the composition of the alloy when fretting corrosion took place in saline. The nickel/chromium ratio in the albumin and gamma globulin solutions was increased relative to that predicted indicating preferential release of nickel in protein solutions.