Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines

The deterioration of cement mortar lining (CML) has a significant impact on the corrosion of ductile iron pipes, and further affects the water quality of transported reclaimed water. In this study, the different coverage levels of CML (such as lined (100%), 90% and 50% lining coverage and unlined) w...

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Autores principales: Liu, Yunhui, Tian, Yimei, Zhang, Rufang, Guo, Hao, Zhao, Weigao, Huang, Jianjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057434/
https://www.ncbi.nlm.nih.gov/pubmed/35515357
http://dx.doi.org/10.1039/d0ra08042j
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author Liu, Yunhui
Tian, Yimei
Zhang, Rufang
Guo, Hao
Zhao, Weigao
Huang, Jianjun
author_facet Liu, Yunhui
Tian, Yimei
Zhang, Rufang
Guo, Hao
Zhao, Weigao
Huang, Jianjun
author_sort Liu, Yunhui
collection PubMed
description The deterioration of cement mortar lining (CML) has a significant impact on the corrosion of ductile iron pipes, and further affects the water quality of transported reclaimed water. In this study, the different coverage levels of CML (such as lined (100%), 90% and 50% lining coverage and unlined) were used for simulating different degrees of deterioration of CML. Electrochemical measurements, water quality testing and corrosion product microanalysis were carried out to monitor the corrosion process and investigate the corrosion mechanism. The results showed that the order of maximum corrosion rate under different conditions was: 50% lining coverage (0.159 mm a(−1)) > unlined (0.110 mm a(−1)) > 90% lining coverage (0.042 mm a(−1)) > 100% lining coverage (0.007 mm a(−1)). The complete lining can provide a higher pH to passivate the ductile iron to achieve perfect protection. When the damage of CML was very small, the self-healing of the lining can restore the protection ability to a great extent. The corrosion of the ductile iron with 50% lining was even more serious than the unlined ductile iron. The negative effect of the silicate dissolved from the lining on the crystal structure, growth and stabilization process of the corrosion products was considered to be the reason for the more acute corrosion of the pipeline with a large area lining spalling.
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spelling pubmed-90574342022-05-04 Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines Liu, Yunhui Tian, Yimei Zhang, Rufang Guo, Hao Zhao, Weigao Huang, Jianjun RSC Adv Chemistry The deterioration of cement mortar lining (CML) has a significant impact on the corrosion of ductile iron pipes, and further affects the water quality of transported reclaimed water. In this study, the different coverage levels of CML (such as lined (100%), 90% and 50% lining coverage and unlined) were used for simulating different degrees of deterioration of CML. Electrochemical measurements, water quality testing and corrosion product microanalysis were carried out to monitor the corrosion process and investigate the corrosion mechanism. The results showed that the order of maximum corrosion rate under different conditions was: 50% lining coverage (0.159 mm a(−1)) > unlined (0.110 mm a(−1)) > 90% lining coverage (0.042 mm a(−1)) > 100% lining coverage (0.007 mm a(−1)). The complete lining can provide a higher pH to passivate the ductile iron to achieve perfect protection. When the damage of CML was very small, the self-healing of the lining can restore the protection ability to a great extent. The corrosion of the ductile iron with 50% lining was even more serious than the unlined ductile iron. The negative effect of the silicate dissolved from the lining on the crystal structure, growth and stabilization process of the corrosion products was considered to be the reason for the more acute corrosion of the pipeline with a large area lining spalling. The Royal Society of Chemistry 2020-10-29 /pmc/articles/PMC9057434/ /pubmed/35515357 http://dx.doi.org/10.1039/d0ra08042j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Liu, Yunhui
Tian, Yimei
Zhang, Rufang
Guo, Hao
Zhao, Weigao
Huang, Jianjun
Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title_full Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title_fullStr Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title_full_unstemmed Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title_short Corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
title_sort corrosion behavior and mechanism of ductile iron with different degrees of deterioration of cement mortar lining in reclaimed water pipelines
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057434/
https://www.ncbi.nlm.nih.gov/pubmed/35515357
http://dx.doi.org/10.1039/d0ra08042j
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