Protection of reinforcement steel corrosion by phenylphosphonic acid pre-treatment PART II: Tests in mortar medium

A pre-treatment of steel reinforcement in mortar by a 72 h immersion in 0.1 M phenyl-phosphonic acid (C6H5P(O)(OH)2; PPA) was investigated. Then effectiveness of this procedure for protection against the corrosion of steel bars embedded in pre- or post-addition of sodium chloride mortar was evaluate...

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Bibliographic Details
Published in:Cement & concrete composites 2016-01, Vol.65, p.94-100
Main Authors: Etteyeb, N., Dhouibi, L., Takenouti, H., Triki, E.
Format: Article
Language:English
Subjects:
Chemical Sciences
Electrochemical Impedance Spectroscopy
Mortar
Other
Phenylphosphonic acid
Pre-treatment
Sodium chloride
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Summary:A pre-treatment of steel reinforcement in mortar by a 72 h immersion in 0.1 M phenyl-phosphonic acid (C6H5P(O)(OH)2; PPA) was investigated. Then effectiveness of this procedure for protection against the corrosion of steel bars embedded in pre- or post-addition of sodium chloride mortar was evaluated by electrochemical impedance spectroscopy, visual inspection, SEM, and EDS analyses. The results showed that for non-treated steel reinforcement, the charge transfer resistance (Rt) decreases considerably with time indicating a very advanced state of corrosion after 54 months corrosion test. In contrast, for pre-treated steel rebar, this resistance remains high reflecting the effectiveness of the pre-treatment method against corrosion. The corrosion rate evaluated from the charge transfer resistance at 54 months corrosion in chloride containing medium was 0.5 μm year−1.
ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2015.10.010