Influence of chloride ion on depassivation of passive film on galvanized steel bars in concrete pore solution

Haibing Zheng; Jian-Guo Dai; Weihua Li; Chi Sun Poon

doi:10.1016/j.conbuildmat.2018.01.174

Influence of chloride ion on depassivation of passive film on galvanized steel bars in concrete pore solution

Haibing Zheng
, Jian-Guo Dai
, Weihua Li^*
, Chi Sun Poon^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

68 Citations (Scopus)

Abstract

This work aimed at studying the depassivation mechanism of the passive film on galvanized steel bar in concrete pore solution with different concentrations of chloride ion. The results showed that in a saturated Ca(OH)₂ solution, the critical chloride values for the depassivation of the passive films formed on galvanized steel bars and zinc metal specimens were 0.2 M and 0.3 M respectively. When the Cl⁻ concentration was lower than the critical value, the donor density of the passive film increased and thus the protective property reduced with increasing the concentration of chloride ion, which could be interpreted by the point defect model (PDM). The corrosion products formed on the galvanized steel surface could inhibit the further ingress of the chloride ions and enhance the protective property, while such effect was not obvious for the zinc metal. © 2018

Original language	English
Pages (from-to)	572-580
Number of pages	9
Journal	Construction and Building Materials
Volume	166
Online published	22 Feb 2018
DOIs	https://doi.org/10.1016/j.conbuildmat.2018.01.174
Publication status	Published - 30 Mar 2018
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

The authors gratefully acknowledge the financial support of Hong Kong Branch of National Engineering Research Center for Steel Construction through the project 1-BBYP and the Hong Kong Polytechnic University through the project 1-ZVGE. Weihua Li also acknowledges the support of National Science Fund for Distinguished Young Scholars ( 51525903 ).

Research Keywords

Chloride ions
Concrete pore solution
Corrosion
Galvanized steel
Passive film

Access Output

10.1016/j.conbuildmat.2018.01.174

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{896b38af72bd4639a2cd128576f1d7f8,

title = "Influence of chloride ion on depassivation of passive film on galvanized steel bars in concrete pore solution",

abstract = "This work aimed at studying the depassivation mechanism of the passive film on galvanized steel bar in concrete pore solution with different concentrations of chloride ion. The results showed that in a saturated Ca(OH)2 solution, the critical chloride values for the depassivation of the passive films formed on galvanized steel bars and zinc metal specimens were 0.2 M and 0.3 M respectively. When the Cl− concentration was lower than the critical value, the donor density of the passive film increased and thus the protective property reduced with increasing the concentration of chloride ion, which could be interpreted by the point defect model (PDM). The corrosion products formed on the galvanized steel surface could inhibit the further ingress of the chloride ions and enhance the protective property, while such effect was not obvious for the zinc metal. {\textcopyright} 2018",

keywords = "Chloride ions, Concrete pore solution, Corrosion, Galvanized steel, Passive film",

author = "Haibing Zheng and Jian-Guo Dai and Weihua Li and Poon, \{Chi Sun\}",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

year = "2018",

month = mar,

day = "30",

doi = "10.1016/j.conbuildmat.2018.01.174",

language = "English",

volume = "166",

pages = "572--580",

journal = "Construction and Building Materials",

issn = "0950-0618",

publisher = "Elsevier Ltd.",

}

TY - JOUR

T1 - Influence of chloride ion on depassivation of passive film on galvanized steel bars in concrete pore solution

AU - Zheng, Haibing

AU - Dai, Jian-Guo

AU - Li, Weihua

AU - Poon, Chi Sun

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2018/3/30

Y1 - 2018/3/30

N2 - This work aimed at studying the depassivation mechanism of the passive film on galvanized steel bar in concrete pore solution with different concentrations of chloride ion. The results showed that in a saturated Ca(OH)2 solution, the critical chloride values for the depassivation of the passive films formed on galvanized steel bars and zinc metal specimens were 0.2 M and 0.3 M respectively. When the Cl− concentration was lower than the critical value, the donor density of the passive film increased and thus the protective property reduced with increasing the concentration of chloride ion, which could be interpreted by the point defect model (PDM). The corrosion products formed on the galvanized steel surface could inhibit the further ingress of the chloride ions and enhance the protective property, while such effect was not obvious for the zinc metal. © 2018

AB - This work aimed at studying the depassivation mechanism of the passive film on galvanized steel bar in concrete pore solution with different concentrations of chloride ion. The results showed that in a saturated Ca(OH)2 solution, the critical chloride values for the depassivation of the passive films formed on galvanized steel bars and zinc metal specimens were 0.2 M and 0.3 M respectively. When the Cl− concentration was lower than the critical value, the donor density of the passive film increased and thus the protective property reduced with increasing the concentration of chloride ion, which could be interpreted by the point defect model (PDM). The corrosion products formed on the galvanized steel surface could inhibit the further ingress of the chloride ions and enhance the protective property, while such effect was not obvious for the zinc metal. © 2018

KW - Chloride ions

KW - Concrete pore solution

KW - Corrosion

KW - Galvanized steel

KW - Passive film

UR - https://www.scopus.com/pages/publications/85041466355

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85041466355&origin=recordpage

U2 - 10.1016/j.conbuildmat.2018.01.174

DO - 10.1016/j.conbuildmat.2018.01.174

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85041466355

SN - 0950-0618

VL - 166

SP - 572

EP - 580

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Influence of chloride ion on depassivation of passive film on galvanized steel bars in concrete pore solution

Abstract

Bibliographical note

Funding

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this