选择4种冶金因素有代表性的低碳钢，通过极化试验比较了 它们之间的点蚀诱发敏感性.电子探针分析了不同夹杂物在诱发点蚀过程中的腐蚀特征 ，显微腐蚀试验确定了点蚀诱发初期溶解产物的性质.结果表明,沸腾钢的点蚀敏感 性显著低于镇静钢，稀土处理镇静钢则介于前两者之间.夹杂物是钢中主要点蚀诱发源，紧 靠夹杂物的钢基体处的钝化膜保护作用最弱，点蚀均从该处基体诱发.同类夹杂物在不同类 型钢中的点蚀诱发敏感性差异较大.同一钢中不同类型夹杂物的点蚀诱发敏感性差异很小, 硫化物夹杂较其它夹杂物的点蚀诱发敏感性强.
Four low carbon steels with different metallurgy factors have been se lected.Their susceptibility to pitting has been compared by means of polariza tion test.Characteristic of pitting initiated by different inclusions has been studied with the EPMA and the dissolving production has been confirmed with the MCT during pitting initiation.The results showed that the susceptibility of boi ling steel to pitting initiation was markedly lower than those of killed steel , the pitting susceptibility of killed steel treated by rare earth was between bo iling steel and common killed steel.The inclusions were the sites most suscepti ble to pitting initiation.Passivation film of boundary between steel matrix and inclusions was the weakest and the early pitting corrosion was caused from here .The difference of susceptibility to pitting initiated by homogeneous inclusion s was large when these inclusions existed in different kind of steels.The diffe rence of susceptibility to pitting initiated by different inclusions in the one steel was small and the sulfide inclusions had bigger ability of initiating pitt ing than other types of inclusions did.
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