氯离子对球墨铸铁管土壤腐蚀影响机理研究<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.011.021

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Abstract An accelerated buried coupon test coupled with electrochemical impedance spectroscopy and microanalysis was conducted to research the effect of chloride ions (Cl^-) on soil corrosion mechanism, corrosion layer structure and corrosion products. The main conclusions are as follows. (1) Localized corrosion was the main corrosion type, and the corrosion rate and pitting depth of ductile iron increased with the increasing of Cl^- content; the pitting depth and corrosion time presented a power function relationship, and the local corrosion was especially serious when the Cl^- content was higher than 0.515%. (2) Three stages were observed during ductile iron corrosion: pitting induction stage, pitting developmental stage, and stable corrosion stage; charge transfer was the control step in the first two stages and oxygen mass diffusion turned to be the key step in the third stage. (3) Iron oxides and iron oxyhydroxides were main crystal minerals; β-FeOOH and ferrous oxychlorides appeared in high Cl^- environment accelerated the electrochemical corrosion of ductile iron.

Key words： ductile iron pipe soil corrosion chlorine ion electrochemical impedance spectroscopy (EIS)

Published: 10 June 2017 Online: 2018-05-04

CLC number:

TG172.4

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	Articles by authors
	GUO Hao
	TIAN Yimei
	PEI Yunsheng
	CHEN Ying
	LIU Xingfei

Cite this article:

GUO Hao,TIAN Yimei,PEI Yunsheng, et al. Mechanism of the Effect of Chloride Ions on Soil Corrosion for Ductile Iron Pipes[J]. Materials Reports, 2017, 31(11): 151-157.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.011.021 OR https://www.mater-rep.com/EN/Y2017/V31/I11/151

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