Brown S A, Hughes P J, Merritt K
Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106.
J Orthop Res. 1988;6(4):572-9. doi: 10.1002/jor.1100060415.
Two models were used to study fretting corrosion of surgical alloys. In the first, the amount of load and motion between plates and screws was controlled, and corrosion rates of stainless steel and MP35N were determined by measurements of component weight loss and metal ion concentration in the test solutions. Stainless steel had the higher rate of fretting corrosion. The addition of 10% serum to saline resulted in a significant reduction of the corrosion rate of stainless steel and MP35N. The use of stainless steel screws in a mixed-metal combination with MP35N and titanium plates showed minimal effects on the performance of the stainless steel screws but an increase in fretting corrosion of the MP35N plates. In the second model, plates were applied to glass fiber-reinforced plastic tubes as bone analogues and subjected to cyclic axial loads. These results demonstrated a reduction in fretting corrosion rates associated with an increase in screw torque and a decrease in axial load. Corrosion rates were minimal with intact tubes simulating healed fractures and greatest with an oblique-cut fracture simulation. These models have proven useful for the evaluation of fretting corrosion rates of different alloys and for evaluation of variables such as fracture stability.
使用了两种模型来研究外科合金的微动腐蚀。在第一种模型中，控制钢板和螺钉之间的载荷量和运动量，并通过测量测试溶液中部件的重量损失和金属离子浓度来确定不锈钢和MP35N的腐蚀速率。不锈钢的微动腐蚀速率更高。向盐水中添加10%的血清可显著降低不锈钢和MP35N的腐蚀速率。在与MP35N和钛板的混合金属组合中使用不锈钢螺钉对不锈钢螺钉的性能影响最小，但会增加MP35N板的微动腐蚀。在第二种模型中，将钢板应用于玻璃纤维增强塑料管作为骨模拟物，并施加循环轴向载荷。这些结果表明，随着螺钉扭矩的增加和轴向载荷的减小，微动腐蚀速率降低。模拟愈合骨折的完整管的腐蚀速率最小，而模拟斜切骨折的腐蚀速率最大。这些模型已被证明可用于评估不同合金的微动腐蚀速率以及评估诸如骨折稳定性等变量。
