EFFECT OF METALLURGY FACTORS ON SUSCEPTIBILITY TO PITTING INITIATION IN STEELS

J Chin Soc Corr Pro

2009, Vol. 29

Issue (2): 127-131 DOI:

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EFFECT OF METALLURGY FACTORS ON SUSCEPTIBILITY TO PITTING INITIATION IN STEELS

ZHANG Heng¹;CHEN Xuequn²;CHANG Wanshun²

1. 92601 Navy; Zhanjiang 524009
2. Department of Chemistry and Material;University of Naval Engineering; Wuhan 430033

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Abstract

Several low-carbon steels and low-alloy steels with representative metallurgical factors were selected. Their susceptibility to pitting initiation was compared by means of polarization test in 3% NaCl solution with pH=10. Characteristic of pitting initiated by inclusions in steels was analyzed with the EPMA. The results showed that the resistance of susceptibility to pitting in boiling steel was obviously better than that of killed steel, the resistance of susceptibility to pitting in killed steel treated by rare earth was improved, between boiling and killed steel. The resistance of susceptibility of Ni-Cr steel to pit was higher than that of Mn steel, which indicated the susceptibility to pitting initiation was significantly affected by alloy elements. The inclusions were the most primary sites of pitting initiation. Passivation film of boundary between steel matrix and inclusions was the weakest and pitting was firstly initiated there.

Key words: boiling steel killed steel low-alloy steel pitting inclusion

Received: 16 July 2007

ZTFLH:

TG172.5

Corresponding Authors: ZHANG Heng E-mail: jzy426@sina.com

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Cite this article:

ZHANG Heng CHEN Xuequn CHANG Wanshun. EFFECT OF METALLURGY FACTORS ON SUSCEPTIBILITY TO PITTING INITIATION IN STEELS. J Chin Soc Corr Pro, 2009, 29(2): 127-131.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I2/127

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