Journal Published Online: 01 December 1995
Volume 17, Issue 2

The Passivation of Reinforcing Steel Exposed to Synthetic Pore Solution and the Effect of Calcium-Nitrite Inhibitor

CODEN: CCAGDP

Abstract

Potentiodynamic polarization studies were conducted on rebar steel in a simulated cement paste pore solution containing sodium chloride, with and without additions of calcium-nitrite inhibitor. The rebar steel passivated spontaneously and displayed an extensive passive potential range in both cases. Surprisingly, however, passivity breakdown was observed to occur at a lower potential in the inhibited solution. XPS surface analysis indicated a similar composition of the passive films formed in the inhibited and uninhibited pore solutions. Only trace amounts of nitrogen were detected in the passive films. On the basis of the XPS results and the reported nitrite-inhibition mechanism, it would appear that the smaller passive potential range associated with the inhibitor additions is related to a decrease in pH recorded after the inhibitor addition.

Author Information

Tullmin, M
Queen's University, Kingston, Ontario, Canada
Mammoliti, L
Queen's University, Kingston, Ontario, Canada
Sohdi, R
University of Toronto, Centre for Biomaterials, Toronto, Ontario, Canada
Hansson, CM
Queen's University, Kingston, Ontario, Canada
Hope, BB
Queen's University, Kingston, Ontario, Canada
Pages: 11
Price: $25.00
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Stock #: CCA10139J
ISSN: 0149-6123
DOI: 10.1520/CCA10139J