Takada Yukyo, Takahashi Masatoshi, Kikuchi Akira, Tenkumo Taichi
Division of Dental Biomaterials, Tohoku University Graduate School of Dentistry.
Dent Mater J. 2014;33(6):859-64. doi: 10.4012/dmj.2014-162.
The corrosion resistance of different magnetic assemblies—Magfit DX800 (Aichi Steel), Gigauss D800 (GC), Hyper Slim 4013, and Hicorex Slim 4013 (Hitachi Metals)—were electrochemically evaluated using anodic polarization curves obtained in 0.9% NaCl solution at 37°C. Stainless steels (444, XM27, 447J1, and 316L) composing the magnetic assemblies were also examined as controls. This revealed that all of the magnetic assemblies break down at 0.6-1.1 V; however, their breakdown potentials were all still significantly higher (p<0.05) than that of 316L. The distribution of elements in the laser welding zone between the yoke and shield ring was analyzed using EPMA; except with Magfit DX800, where the Cr content of the shield ring weld was greater than that of 316L. These magnetic assemblies are expected to have good corrosion resistance in the oral cavity, as their breakdown potentials are sufficiently higher than the 316L commonly used as a surgical implant material.
使用在37°C的0.9%氯化钠溶液中获得的阳极极化曲线，对不同磁性组件（Magfit DX800（爱知制钢）、Gigauss D800（GC）、Hyper Slim 4013和Hicorex Slim 4013（日立金属））的耐腐蚀性进行了电化学评估。还对构成磁性组件的不锈钢（444、XM27、447J1和316L）进行了检查作为对照。结果表明，所有磁性组件在0.6 - 1.1 V时都会发生击穿；然而，它们的击穿电位仍均显著高于316L（p<0.05）。使用电子探针微分析仪（EPMA）分析了磁轭和屏蔽环之间激光焊接区域的元素分布；除了Magfit DX800，其屏蔽环焊缝的Cr含量高于316L。这些磁性组件预计在口腔中具有良好的耐腐蚀性，因为它们的击穿电位比通常用作外科植入材料的316L足够高。
