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Laboratory study on the effect of sulfate ions on rebar corrosion

✍ Scribed by A.J. Al-Tayyib; S.K. Somuah; J.K. Boah; P. Leblanc; A.I. Al-Mana

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 398 KB
Volume: 18
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(88)90102-0

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✦ Synopsis

This paper presents the findings of a laboratory investigation in which the role of sulfate ions on reinforcing steel corrosion has been investigated. 1020 carbon steel specimens were immersed in saturated Ca(OH) 2 solutions containing different concentrations of sulfate ions and the corrosion rate was determined by linear polarization resistance and A.C. impedance techniques.

The tests were carried out at 220C and 500C.

The ~est results indicate that in the presence of sulfate ions and at 22vC, active corrosion results from modification of the protective passive film to a sulfate film which is less protective than that of the original iron oxide film. Moreover, the combined effect of sulfate ions and elevated temperature results in a seven fold increase in corrosion rate compared to that of the well known chloride ions at normal temperature.

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