Some Laboratory Experiments on the Inhibitor Effect of Sodium Nitrite on Reinforcement Corrosion

    Volume 8, Issue 2 (January 1986)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 7


    Alonso, C
    Researcher and research fellow, Institute of Construction and Cement “Eduardo Torroja,” CSIC, Madrid,

    Andrade, C
    Researcher and research fellow, Institute of Construction and Cement “Eduardo Torroja,” CSIC, Madrid,

    González, JA
    Senior researcher, National Centre of Mettallurgical Research, CSIC, Madrid,

    Abstract

    The summary of several years of research about the inhibitor effect of NO2 on the corrosion of reinforcement is presented. Their inhibitor effect has been studied using galvanostatic and potentiodynamic polarization curves, and we have measured the corrosion rates using the polarization resistance method (linear polarization). Verification has been done by this last technique Rp, that the NO2 in concrete, if it is used in sufficient proportion, is a complete inhibitor when the Cl is added during the mixing (for example, mixing with seawater, calcium chloride (CaCl2) as an accelerator inhibitor). Insufficient amounts of NO2 have never provoked more corrosion in our experiments in concrete. The presence of NO2 always have produced a beneficial effect. The NO2 are also beneficial in carbonated concrete, suppressing or at least reducing the attacked area and the corrosion rate of the reinforcements.


    Paper ID: CCA10064J

    DOI: 10.1520/CCA10064J

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    Title Some Laboratory Experiments on the Inhibitor Effect of Sodium Nitrite on Reinforcement Corrosion
    Symposium , 0000-00-00
    Committee C09