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。
Treatment of Ferrous Materials. Iron is the major constituent in the steel used in tooling, to which carbon is added in order that the steel may harden.
铁材料的热处理铁是用于制作工具的钢材的主要成分，其中加入碳是为了使钢变硬。
Cast iron plate is crossed, surveying, welding, tooling process can not be a lack of bench, cast iron plate can also do mechanical test stand, and so on.
铸铁平板是划线、测量、铆焊、工装工艺不可以缺少的工作台，铸铁平板也可以做机械试验台，等等。
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