Volume 17, Issue 2 (December 1995)

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

    CODEN: CCAOAD

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    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:

    Hope, BB
    Queen's University, Kingston, Ontario

    Hansson, CM
    Queen's University, Kingston, Ontario

    Mammoliti, L
    Queen's University, Kingston, Ontario

    Tullmin, M
    Queen's University, Kingston, Ontario

    Sohdi, R
    University of Toronto, Centre for Biomaterials, Toronto, Ontario


    Stock #: CCA10139J

    ISSN: 0149-6123

    DOI: 10.1520/CCA10139J

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    Author
    Title The Passivation of Reinforcing Steel Exposed to Synthetic Pore Solution and the Effect of Calcium-Nitrite Inhibitor
    Symposium , 0000-00-00
    Committee C09