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。
The major reason of the formation of quench cracks is the contamination of oxygen in the early processing or unsuitable quench cooling rate during heat treatment.
基于两种机制的提出，可以较好地说明影响淬火裂纹形成的主要原因是氧的污染和不适宜的淬火冷却速度。
It can lead to treatment fluid reverse flow, which cause formation contamination. After treatment, production declines dramatically, and with long period of production restoration.
作业易造成作业液倒灌污染地层，作业后产量大幅下降，产量恢复周期长。
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