THE INFLUENCE OF HUNK OF COATING DEFECT ON CORROSIVE CHARACTERISTIC OF CARBON STEELS AND EFFECTIVENESS OF CATHODIC PROTECTION

J Chin Soc Corr Pro

2005, Vol. 25

Issue (2): 74-78 DOI:

Research Report

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THE INFLUENCE OF HUNK OF COATING DEFECT ON CORROSIVE CHARACTERISTIC OF CARBON STEELS AND EFFECTIVENESS OF CATHODIC PROTECTION

Yiquan Song;Cuiwei Du;Xiaogang Li;Junwei Wu;Yonggui Yan

北科大腐蚀与防护中心北京市腐蚀、磨蚀与表面工程重点实验室

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Abstract Taking epoxy coal tar as material of coating,the influene of hunk of coating defect on corrosive characteristic of carbon steels and effectiveness of cathodic protection has been investigated.EIS of Q235 steel in 3.5% NaCl water solution with hunk of coating defect was determined.Experiments have shown that,on free corrosion potential,the corrosion of carbon steels with disbonding defect of coating os heavier than that of breaking defect of coating with times.On cathodic polarization poteneial,the effectiveness of cathodic protection of carbon steels with disbonding defect of coating gradually weaens with times and loses eventually.The effection of cathodic protection of carbon steels with breaking defect of coating is better than that of carbon steels with disbonding defect of coating.Penetration of electrolyte solution into coating and the creice corrosion between coating defect and surface of steel matrix is main reason of corrosion on carbon steels with hunk of coating defects.

Key words: hunk of coating defect EIS cathodic protection crevice corrosion

Received: 12 September 2003

ZTFLH:

TG171

Corresponding Authors: Yiquan Song E-mail: syqrylss@163.com

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Yiquan Song; Cuiwei Du; Xiaogang Li; Junwei Wu; Yonggui Yan. THE INFLUENCE OF HUNK OF COATING DEFECT ON CORROSIVE CHARACTERISTIC OF CARBON STEELS AND EFFECTIVENESS OF CATHODIC PROTECTION. J Chin Soc Corr Pro, 2005, 25(2): 74-78 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I2/74

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