Investigation of Mott–Schottky Analysis Test Parameters to Study the Semiconductive Properties of Passive Films of Carbon Steel in Highly Alkaline Environments
| Autor: | Jon Williamson, O. B. Isgor |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Calcium hydroxide Polymers and Plastics Passivation Carbon steel 020209 energy Metals and Alloys Rebar Mott schottky 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology law.invention chemistry.chemical_compound chemistry Depletion region Mechanics of Materials law 0202 electrical engineering electronic engineering information engineering Materials Chemistry Ceramics and Composites engineering Composite material 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | Advances in Civil Engineering Materials. 5:20150031 |
| ISSN: | 2165-3984 |
| DOI: | 10.1520/acem20150031 |
| Popis: | A testing methodology for using Mott–Schottky (M-S) analysis to study the semiconductive properties of passive films that form on carbon steel in simulated concrete pores solutions (pH > 12.5) is presented. The development of the methodology includes determining the proper M-S potential sweep range, rate, and frequency for the passive steel, which were found to be −0.5 to 0.5 V, 18 mV/s, and 1000 Hz, respectively. The methodology was then applied to steel rebar in a saturated calcium hydroxide passivating solution (pH 12.6) to simulate the highly alkaline environments seen in concrete. Potentiostatically formed passive film was different from the film formed under open-circuit conditions. The passive film on steel rebar was found to be n-type with two discrete donor species. A donor density on the order of 1021 cm−3, a flatband potential of −0.53 V, and a maximum space charge layer thickness of 0.4 nm at full passivation were reported. |
| Databáze: | OpenAIRE |
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