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Insight into the corrosion evolution of Fe-based amorphous coatings under wet-dry cyclic conditions
Wu, J.; Cui, J. P.; Zheng, Q. J.; Zhang, S. D.; Sun, W. H.; Yang, B. J.; Wang, J. Q.
2019-10-01
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume319Pages:966-980
AbstractUnderstanding the corrosion behavior of Fe-based amorphous coatings under wet-dry cyclic conditions is of pretty importance for coating applications in marine environments. In this paper, the corrosion evolutions of the coatings under wet-dry cyclic conditions were investigated by electrochemical impedance spectroscopy (EIS), scanning electron microscope (SEM) and transmission electron microscopy (TEM). Accurate charge transfer resistance (R-t) was obtained through fitting EIS results using a modified transmission line equivalent circuit model and a landscape map of Rt was constructed for a panoramic investigation on coating corrosion. The results show that the corrosion rate of the coating changes cyclically under wet-dry cyclic conditions. Corrosion within a single wet-dry cycle can be presented as four stages: an initial decrease of corrosion rate due to passivation or repassivation when the coating is wetted, then a slow increase due to concentrated aggressive ions with solution evaporation, followed by a rapid increment associated with fast oxygen transport under ultrathin solution film and finally a stable stage as solution dries out. It is deduced that an oxygen concentration gradient can form between the inside and the outside of coating pores when the solution film over the coating is very thin, which further promotes the localized corrosion in the pores. According to the landscape map of R-t, the coating maintains its high corrosion resistance for the initial 33 wet-dry cycles. But its corrosion resistance decreases significantly in the 35th wet-dry cycle accompanied by the attack of localized corrosion. After 65 wet dry cycles, the coating fails due to the penetration of localized corrosion. The interparticle oxide layers are defective, which enhances the localized corrosion process. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordAmorphous coating EIS Wet-dry cyclic test Thin electrolyte film Localized corrosion
Indexed BySCI
Language英语
WOS IDWOS:000480706000098
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80745
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Wu, J.,Cui, J. P.,Zheng, Q. J.,et al. Insight into the corrosion evolution of Fe-based amorphous coatings under wet-dry cyclic conditions[J]. ELECTROCHIMICA ACTA,2019,319:966-980.
APA Wu, J..,Cui, J. P..,Zheng, Q. J..,Zhang, S. D..,Sun, W. H..,...&Wang, J. Q..(2019).Insight into the corrosion evolution of Fe-based amorphous coatings under wet-dry cyclic conditions.ELECTROCHIMICA ACTA,319,966-980.
MLA Wu, J.,et al."Insight into the corrosion evolution of Fe-based amorphous coatings under wet-dry cyclic conditions".ELECTROCHIMICA ACTA 319(2019):966-980.
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