期刊
CEMENT AND CONCRETE RESEARCH
卷 71, 期 -, 页码 93-105出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2015.02.004
关键词
Backscattered Electron Imaging; X-ray micro-diffraction; Corrosion; Concrete; Stainless steel
资金
- scientific project The composition of corrosion products on corrosion resistant concrete reinforcement - Unity through Knowledge Fund (UKF) [73/10]
- scientific project The Development of New Materials and Concrete Structure Protection Systems - Croatian Ministry of Education, Science and Sport [082-0822161-2159]
- King Abdullah University of Science and Technology (KAUST) [KUS-l1-004021]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Directorate For Geosciences
- Division Of Earth Sciences [1343908] Funding Source: National Science Foundation
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 (mu-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). mu-XRD revealed that goethite (alpha-FeOOH) and akaganeite (beta-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. (C) 2015 Elsevier Ltd. All rights reserved.
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