The effect of fluoride on corrosion of reinforcing steel in alkaline solutions

The influence of fluoride content of alkaline solutions on the corrosion of reinforcements has been studied, by means of electrochemical techniques, in saturated solutions of Ca(OH) 2 and same pH NaOH solutions with additions of NaF, thus simulating the liquid phase of concrete. Fluoride can be pres...

Full description

Saved in:
Bibliographic Details
Published in:Corrosion science 1994-12, Vol.36 (12), p.2169-2180
Main Authors: Macías, A., Escudero, M.L.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The influence of fluoride content of alkaline solutions on the corrosion of reinforcements has been studied, by means of electrochemical techniques, in saturated solutions of Ca(OH) 2 and same pH NaOH solutions with additions of NaF, thus simulating the liquid phase of concrete. Fluoride can be present as a minor component in low-energy cements. The joint presence of chlorides and fluorides in the corrosion process of steel has also been analysed. It has been established that fluoride anions are able to produce pitting of reinforced steel in alkaline media of high pH. In Ca(OH) 2 saturated solution, the precipitation of CaF 2 lowers F − concentration below the minimum that promotes a pitting corrosion process; if there is not enough Ca(OH) 2 to precipitate all F − ions, the presence of fluoride in these media causes an increase in passive film dissolution and corrosion rates.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(94)90015-9