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Title: Spatial distribution of crystalline corrosion products formed during corrosion of stainless steel in concrete

The mineralogy and spatial distribution of nano-crystalline corrosion products that form in the steel/concrete interface were characterized using synchrotron X-ray micro-diffraction (μ-XRD). Two types of low-nickel high-chromium reinforcing steels embedded into mortar and exposed to NaCl solution were investigated. Corrosion in the samples was confirmed by electrochemical impedance spectroscopy (EIS). μ-XRD revealed that goethite (α-FeOOH) and akaganeite (β-FeOOH) are the main iron oxide–hydroxides formed during the chloride-induced corrosion of stainless steel in concrete. Goethite is formed closer to the surface of the steel due to the presence of chromium in the steel, while akaganeite is formed further away from the surface due to the presence of chloride ions. Detailed microstructural analysis is shown and discussed on one sample of each type of steel. - Highlights: • Synchrotron micro-diffraction used to map the distribution of crystalline phases. • Goethite and akaganeite are the main corrosion products during chloride induced corrosion in mortar. • Layers of goethite and akaganeite are negatively correlated. • EDS showed Cr present in corrosion products identified by SEM.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [5]
  1. Department of Materials, Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb (Croatia)
  2. Middle East Technical University, Department of Civil Engineering, Ankara (Turkey)
  3. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720 (United States)
  4. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720 (United States)
  5. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
22475504
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 71; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM; CONCRETES; CORROSION; CORROSION PRODUCTS; ELECTROCHEMISTRY; GOETHITE; IMPEDANCE; INTERFACES; IRON OXIDES; MICROSTRUCTURE; MORTARS; NANOSTRUCTURES; NICKEL; SCANNING ELECTRON MICROSCOPY; SODIUM CHLORIDES; SPATIAL DISTRIBUTION; SPECTROSCOPY; STAINLESS STEELS; SURFACES; X-RAY DIFFRACTION