硫化物夹杂对低碳钢孔蚀扩展的影响

中国腐蚀与防护学报

2000, Vol. 20

Issue (2): 65-73

研究报告

本期目录 | 过刊浏览

硫化物夹杂对低碳钢孔蚀扩展的影响

陈学群;孔小东;杨思诚

武汉市海军工程大学金工教研室

Effect of Sulfide Inclusions on Propagation of Pitting in Carbon Steels

Xuequn Chen;Xiaodong Kong;Sicheng Yang

武汉市海军工程大学金工教研室

全文: PDF(318 KB)

摘要: 选择现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。

关键词 ：碳钢, 孔蚀, 闭寒腐蚀电池, 硫化物夹杂物

Abstract：Using OCC simulation test, behavior of pitting propagation of two carbon steels for shipbuilding with different sulfide inclusions in synthetic seawater was studied. Test results showed that the zero current potential of the steel with type Ⅱ sulfide was more negative than that of the steel with type Ⅰ sulfilde; and at the same cathodic polarization potential, the anodic dissolution current of the former was greater than that of the latter. The effect of sulfide inclusions on the pitting propagation was examined by means of microanalysis. It was found that the sulfide accelerated propagation of the pit with a higher dissolution speed than that of the steel matrix. Because type Ⅱ sulfide was of the thin piece shape and presented in crowds, the dissolution along it could easily spread from one piece to another. Type Ⅰsulfide, with the shape similar to potato or cigar, presented in steel bulk separately. Such that, the dissolution around the latter couldn't spread as the former did. In addition, because typeⅡ sulfide had much larger Sv (phase boundary surface) than type Ⅰ sulfide, the corrosion propagation of the macro-pit was accelerated much more quickly by the former than by the latter.

Key words： carbon steel pitting OCC sulfide inclusion

收稿日期: 1999-04-27

ZTFLH:

TG172.5

通讯作者: 陈学群

Corresponding author: Xuequn Chen

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引用本文:

陈学群; 孔小东; 杨思诚 . 硫化物夹杂对低碳钢孔蚀扩展的影响[J]. 中国腐蚀与防护学报, 2000, 20(2): 65-73 .
Xuequn Chen, Xiaodong Kong, Sicheng Yang. Effect of Sulfide Inclusions on Propagation of Pitting in Carbon Steels. J Chin Soc Corr Pro, 2000, 20(2): 65-73 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2000/V20/I2/65

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