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Title: Passivation of Steel Surface in the Typical Concrete Environment: A Critical Issue in Understanding Reinforcement Corrosion
Accession Number: 01372812
Record Type: Component
Abstract: A clear understanding of the mechanisms of passivation and depassivation of steel surface is critical to the effective control of rebar corrosion. The process of passivation involves oxidation of iron atoms in the typical concrete environment. Traditional electrochemical approach of interpreting steel corrosion follows voltage and current changes as a result of electrode reactions, therefore is incapable of depicting iron oxidation and the incurred structural change at the atomic scale. A research study was conducted recently to simulate the passivation process of steel using a Quantum Chemistry-based reactive force field. The initiation and growth of oxides were found to be highly dependent on the thermodynamics and availability of reactants. Three oxidation stages were identified until a high-density triplex structure was formed on iron surface, after which the oxidation of iron progressed at a significantly reduced speed. Results from this study will benefit improving the knowledge base and controlling of rebar corrosion.
Supplemental Notes: This paper was sponsored by TRB committee AHD45 Corrosion
Monograph Title: Monograph Accession #: 01362476
Report/Paper Numbers: 12-2814
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Pan, TongyanPagination: 16p
Publication Date: 2012
Conference:
Transportation Research Board 91st Annual Meeting
Location:
Washington DC, United States Media Type: Digital/other
Features: Figures; Photos; References; Tables
TRT Terms: Uncontrolled Terms: Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; I60: Maintenance
Source Data: Transportation Research Board Annual Meeting 2012 Paper #12-2814
Files: TRIS, TRB
Created Date: Feb 8 2012 5:12PM
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