Effect of Sulfide Inclusions on Propagation of Pitting in Carbon Steels

J Chin Soc Corr Pro

2000, Vol. 20

Issue (2): 65-73 DOI:

Research Report

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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

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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

Received: 27 April 1999

ZTFLH:

TG172.5

Corresponding Authors: Xuequn Chen

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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 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I2/65

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