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Relationship between the specific surface area of rust and the electrochemical behavior of rusted steel in a wet–dry acid corrosion environment
- Source :
- International Journal of Minerals, Metallurgy, and Materials. 24:55-63
- Publication Year :
- 2017
- Publisher :
- Springer Science and Business Media LLC, 2017.
-
Abstract
- The relationship between the specific surface area (SSA) of rust and the electrochemical behavior of rusted steel under wet–dry acid corrosion conditions was investigated. The results showed that the corrosion current density first increased and then decreased with increasing SSA of the rust during the corrosion process. The structure of the rust changed from single-layer to double-layer, and the γ-FeOOH content decreased in the inner layer of the rust with increasing corrosion time; by contrast, the γ-FeOOH content in the outer layer was constant. When the SSA of the rust was lower than the critical SSA corresponding to the relative humidity during the drying period, condensed water in the micropores of the rust could evaporate, which prompted the diffusion of O2 into the rust and the following formation process of γ-FeOOH, leading to an increase of corrosion current density with increasing corrosion time. However, when the SSA of the rust reached or exceeded the critical SSA, condensate water in the micro-pores of the inner layer of the rust could not evaporate which inhibited the diffusion of O2 and decreased the γ-FeOOH content in the inner rust, leading to a decrease of corrosion current density with increasing corrosion time.
- Subjects :
- Materials science
020209 energy
Mechanical Engineering
Diffusion
Metallurgy
Metals and Alloys
02 engineering and technology
021001 nanoscience & nanotechnology
Electrochemistry
Rust
Corrosion
Geochemistry and Petrology
Mechanics of Materials
Specific surface area
0202 electrical engineering, electronic engineering, information engineering
Materials Chemistry
Relative humidity
Acid corrosion
0210 nano-technology
Layer (electronics)
Subjects
Details
- ISSN :
- 1869103X and 16744799
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- International Journal of Minerals, Metallurgy, and Materials
- Accession number :
- edsair.doi...........7448c84904f4503a89153ece2bf0b2cd