元素以单质形态存在叫游离·游离金属即是游离态的金属,由于自然条件下, 大多数金属在自然界中是以化合态存在的,如铝以铝土矿形式存在,铁以铁矿石形式存在·元素以单质形态存在则为游离态。
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。
Testing for a passive surface is usually accomplished by looking for traces of free iron on the metal surface.
假定如果没有探测到游离铁,则金属表面就是足够清洁以形成均一的氧化物膜的。
The assumption is made that if there is no detectable free iron, the metal surface is clean enough for a uniform oxide film to develop.
该标准声明:柠檬酸-硝酸钠处理在去除游离铁合其他金属污染和轻的表面污染物时,危险性最低。
The standard states that the citric acid-sodium nitrate treatment is the least hazardous for removal of free iron and other metallic contamination and light surface contamination.
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