Abstract
The study of passive layers grown on AISI 316 stainless steel in solutions that simulate concrete pore environments contaminated with Cl- is presented. Model solutions of saturated Ca(OH)2 and cement extract (CE) with and without the addition of 5 g/L of NaCl are compared. Cyclic voltammetry (CV) shows different electrochemical responses of passive layers grown on samples immersed in these solutions under open circuit potential (ocp). A more resistive passive film was found on the samples exposed to the CE solution. The different voltammetric responses suggest differences in composition of the passive layers formed on each solution. XPS spectra confirm the dissimilarity in atomic composition. Optical microscope images and AFM images of the pits formed on the samples illustrate the differences of AISI 316 surface topography after exposure to model solutions. Because of these differences, it is recommended to use CE solution as a model solution and ocp passivation to simulate concrete environments.
| Original language | English |
|---|---|
| Pages (from-to) | 45-53 |
| Number of pages | 9 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 578 |
| Issue number | 1 |
| DOIs | |
| State | Published - Apr 15 2005 |
| Externally published | Yes |
Funding
The authors acknowledge the National Science Foundation for support by Grant DBI-9987028. The authors also thank Mexican CONACYT Grant 29649 U for financial support. The authors thank Dr. Kirk H. Schulz for the use of the Surface Science Laboratory of the Dave C. Swalm School of Chemical Engineering.
Keywords
- Atomic force microscopy
- Chloride
- Concrete
- Corrosion
- Passivation
- Stainless steel
- Voltammetry
- X-ray photoel ectron spectroscopy
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