Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 32, Issue 6, Pages 1453-1463Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-017-1768-6
Keywords
Cr micro-alloying; corrosion-resistant rebar; improved corrosion resistance; simulated concrete pore solutions
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Funding
- National Basic Research Program of China (973 Program) [2015CB655100]
- Natural Science Foundation of China [51308111, 51278098]
- Industry-University-Research Cooperative Innovation Fund of Jiangsu Province [BY2013091]
- Research Project of Science and Technology Development of China Railway Corporation [2014G004-F]
- Six Talent Peak Project of Jiangsu Province [2014-XCL-023, 2016-XCL-196]
- China Postdoctoral Science Foundation [2013M531249]
- Postdoctoral Science Foundation of Jiangsu Province of China [1202008C]
- Applied Research Foundation of Nantong City [BK2013001]
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A new low-cost corrosion-resistant rebar (HRB400R) was designed and fabricated by chromium micro-alloying. The effects of Cr on the passivation and corrosion behavior of this rebar in the simulated concrete pore solutions were studied systematically, and its improved corrosion resistance was revealed. In the Cl--free saturated Ca(OH)(2) solution, the HRB400R rebar presented nearly the same passive film and similar passivation ability compared to the common carbon steel rebar. In the long-term immersion corrosion test in the Cl--contained Ca(OH)(2) solution, the HRB400R rebar presented improved corrosion resistance and obvious longer passivation-maintaining period. Micro-alloying of Cr element in the rebar matrix enhanced its corrosion resistance against Cl--attack and retarded the corrosion initiation in the matrix. In the alkaline NaCl salt spraying test, the HRB400R rebar also presented obviously lower mass-loss rate. The enrichment of Cr element in the rust layer improved its retardant effect to the penetration of aggressive medium, and decreased the corrosion propagation rate of the rebar.
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