Corrosion is an electro-chemical process by which a metal such as mild steel ,returns to its natural state ,state ,such as iron oxide or rust.

上面的译文便犯了定义过宽的错误。 试译：腐蚀是金属（如低碳钢）返回其天然状态（如氧化铁即铁锈）的电化学过程。

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Whereas corrosion of steel occurs due to a drop in activation potential caused by sodium chloride and to the effect of anode polarization produced by electro-chemical factors.

而掺氯化钠混凝土中钢筋由于起坑电位降低，容易因电化学极化作用产生腐蚀。

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The influence of thermal cycles on the enamel coating corrosion resistance was investigated by Weld Thermal Simulation, Electro chemical Technique, SEM and XRD.

采用焊接热模拟、电化学测试、扫描电镜、X射线衍射等方法研究了热循环对喷瓷管道瓷层耐蚀性的影响。

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