INFLUENCE OF ENVIRONMENTAL FACTORS IN YULIN AREA OFTHE SOUTH CHINA SEA ON LOCALIZED CORROSION OF STEELS

J Chin Soc Corr Pro

2003, Vol. 23

Issue (4): 211-216 DOI:

Research Report

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INFLUENCE OF ENVIRONMENTAL FACTORS IN YULIN AREA OFTHE SOUTH CHINA SEA ON LOCALIZED CORROSION OF STEELS

Dayang Liu;Kaijin Wei;Wenjun Li

洛阳船舶材料研究所

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Abstract The severe localized corrosion of steels in Yulin a r ea of the South China Sea was analyzed by the use of macroscopic testing of seaw ater corrosion of typical steels induced by marine organisms,testing of major co rrosive bacteria and FeS in the rust layer on steel specimens and testing of cal cium deposits in the rust layer on steel specimens.The results reveal that the m arine organisms grow vigorously all year round due to rather high temperature of seawater in this area and result in uneven fouling to the surface of steel speci mens,which increases the electrochemical heterogeneity of the surface of steel s pecimens,the amounts of several aerobic bacteria and anaerobic SRB in the rust l ayer on steel specimens exposed in Yulin testing station are several times to th ree orders of magnitude larger than those on steel specimens exposed in Qingdao testing station,where the temperature of seawater is lower,and show collective d istribution;the content of FeS in the corrosion product on steel specimens expo sed in Yulin testing station is 0.1 times to twice higher than that of steel spe cimens exposed in Qingdao testing station.High Content of FeS and severe localiz ed corrosion induced by bacteria are two important factors for aggravation of lo calized corrosion of steels in Yulin area of the South China Sea.

Key words: steel marine environment localized corrosion

Received: 19 August 2002

ZTFLH:

TG172.5

Corresponding Authors: Dayang Liu

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Dayang Liu; Kaijin Wei; Wenjun Li. INFLUENCE OF ENVIRONMENTAL FACTORS IN YULIN AREA OFTHE SOUTH CHINA SEA ON LOCALIZED CORROSION OF STEELS. J Chin Soc Corr Pro, 2003, 23(4): 211-216 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2003/V23/I4/211

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