Testing for a passive surface is usually accomplished by looking for traces of free iron on the metal surface.
钝化表面的检测通常是通过查看金属表面的游离铁的踪迹来完成的。
The presence of exogenous surface contamination, including dirt, grease, free iron from contact with steel tooling, and so forth, may interfere with the formation of the passive film.
外生的表面污染，包括：尘土、油脂、来自钢铁加工的游离铁等等，可以影响到钝化膜的生成。
Two passive magnetic bearings were devised to resist the attractive force between the motor coil iron core and rotor driven magnets.
两个永磁轴承抵消电机线圈铁心与转子驱动磁钢之间的吸引力。
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