Journal
CORROSION SCIENCE
Volume 190, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109657
Keywords
C. Passivity; A. Steel reinforced concrete; B. AFM; B. XPS; B. EIS
Funding
- National Key R & D Program of China [2017YFB0309904]
- National Natural Science Foundation of China [U2001225, 51872097]
- Guangdong International Science and Technology Project [2020A0505100006]
- Pearl River S&T Nova Program of Guangzhou [201806010188]
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In alkali-activated slag, the corrosion behavior of reinforcing steel is significantly influenced by the passive film. A 60 nm adsorption aluminate/silicate layer is formed on the surface of the reinforcing steel, while the influence of S2- leads to a less compact passive film with FeS, resulting in lower resistance. However, the reinforcing steel still shows slightly higher charge transfer resistance in the SSP solution due to the barrier effect of the adsorption layer.
In alkali-activated slag (AAS), the passive film significantly influences the corrosion behavior of the reinforcing steel. The relationship between the surface characteristics and electrochemical performance of the passive reinforcing steel was investigated in simulated alkali-activated slag pore (SSP) solution in this paper. An adsorption aluminate/silicate layer (60 nm) generated on the reinforcing steel surface. Further, due to the influence of S2-, less compact passive film (containing FeS in the inner film) formed, leading to lower passive film resistance. However, the reinforcement still presented slightly higher charge transfer resistance due to the barrier effect of the adsorption layer in SSP solution.
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