Surface area has long been thought to influence the corrosion behavior of medical devices although this phenomenon has not been systematically investigated. Because many nitinol implants are offered in a range of sizes, understanding the influence of device surface area on corrosion susceptibility is key to ensuring nitinol devices are safe. This study evaluates the corrosion susceptibility of amber oxide, mechanically polished and chemically etched nitinol wires with surface areas ranging from 0.05 to 10.0 cm² using a standard test method, ASTM F2129. The corrosion testing shows that as the surface area increased the breakdown potential decreased. Results from the amber oxide and chemically etched samples show a plateauing of breakdown potential at larger surface areas, which suggests that there may be a minimum surface area threshold that could predict the performance of larger devices. Additional testing on electropolished wire and modified laser-cut stents shows a similar decrease in breakdown potential with increased surface area thus corroborating the trend observed with nitinol wires. Overall, surface area was found to affect corrosion susceptibility as measured per ASTM F2129 for a range of nitinol samples.

尽管尚未对此现象进行系统的研究，但长期以来人们一直认为表面积会影响医疗器械的腐蚀行为。由于提供了许多镍钛合金植入物，且尺寸范围不同，因此了解器械表面积对腐蚀敏感性的影响是确保镍钛诺器械安全的关键。这项研究评估了表面积为0.05至10.0 cm ²的琥珀色氧化物，机械抛光和化学蚀刻的镍钛诺线材的腐蚀敏感性使用标准测试方法ASTM F2129。腐蚀测试表明，随着表面积的增加，击穿电位降低。琥珀色氧化物和化学蚀刻样品的结果表明，较大表面积的击穿电位处于平稳状态，这表明可能存在一个最小表面积阈值，可以预测较大器件的性能。在电抛光丝和改良型激光切割支架上进行的其他测试显示，随着表面表面积的增加，击穿电位的下降幅度也与此相似，从而证实了镍钛诺丝的趋势。总体而言，根据ASTM F2129对一系列镍钛诺样品进行测量，发现表面积会影响腐蚀敏感性。