选择两种具有不同类型硫化物夹杂的碳钢 ,通过模拟蚀孔的闭塞腐蚀电池试验 ,研究了它们在人工海水中的孔蚀扩展行为。结果表明 ,具有Ⅱ类硫化物的钢的零电流电位明显负于具有Ⅰ类硫化物的钢 ;在同样的阴极极化电位下 ,前者的阳极腐蚀电流明显地大于后者。通过显微分析考察了硫化物夹杂对孔蚀扩展过程的影响。结果发现 ,硫化物夹杂处的腐蚀速度明显高于钢基体 ,从而促进了孔蚀的扩展。由于Ⅱ类硫化物的相界面积远大于Ⅰ类硫化物 ,前者对孔蚀扩展的促进作用也明显地大于后者。 Two kinds of carbon steels with different types of sulfide inclusions were selected to study their pitting corrosion behavior in artificial seawater by simulating the closed-cell corrosion test. The results show that the zero-current potential of steel with type-II sulfide is significantly lower than that of steel with type-I sulfide. At the same cathodic polarization potential, the anodic corrosion current of the former is obviously larger than the latter. The effect of sulfide inclusions on the pitting corrosion process was investigated by microscopic analysis. As a result, it was found that the corrosion rate at the sulfide inclusions was significantly higher than that of the steel matrix, thereby promoting the growth of pitting corrosion. As the phase Ⅱ area of ​​Type Ⅱ sulfide is much larger than that of the type Ⅰ sulfide, the former also has a greater effect of promoting pitting corrosion than the latter.