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The Effect of Nitrite to Anode Reaction Property in Chloride-Induced Macro-Cell Corrosion

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This research recorded the polarization process of chloride-induced macro-cell corrosion, and polarization ratios and slopes are utilized to reveal the macro-cell inhibiting mechanism by nitrite. The results indicate that the corrosion is mainly controlled by anode and the influence of cathode is tiny in the typical macro-cell corrosion of large cathode and small anode. With the increasing of nitrite concentration in anode, the macro-cell corrosion will be more controlled by anode and the macro-cell current density will be decreased to a lower level. Moreover, the existence of nitrite in anode under the circumstance of chloride-induced macro-cell corrosion can dramatically escalate the anode polarization slope which is the key determinant of the macro-cell corrosion current density decreasing. Additionally, with the increasing of nitrite concentration, the decreasing of macro-cell potential difference will not be appeared in the initial inhibiting period but can be appeared in later inhibiting period. Compared with decreasing of macro-dell potential difference, increasing of anode polarization slope is the main reason to decrease macro-cell corrosion current density.

Keywords: Macro-Cell Corrosion; Nitrite; Polarization Ratio; Polarization Slope; Rebar

Document Type: Research Article

Affiliations: Concrete Laboratory, Department of Civil Engineering, Kyushu Institute of Technology, Kitakyushu-shi 804-8550, Japan

Publication date: September 1, 2017

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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