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 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.
研究了脱壳油菜籽挤压系统参数（套筒温度、螺杆转速、螺头至模板距离、模孔长度、模孔孔径）对从榨笼中挤压出的菜籽油的游离脂肪酸、碘值和油脂稳定性的影响规律。
The influence regularity of the parameters of rapeseed extrusion system on free fat acid, iodine value and stability of rapeseed oil extruded from extract cage of extruder was studied.
它作用于油脂自动氧化产生的游离基，形成稳定、低能量的抗氧化剂游离基，从而可使油脂的氧化反应不再传播进行。
It acted on the free radicals, which is formed in fats and oils by oxidation and has to form stable, low-energy free radicals that will stop the propagation of the oxidation in fats and oils.
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