Effect of Phosphate-Based Inhibitor on Corrosion Kinetics and Mechanism for Formation of Passive Film onto the Steel Rebar in Chloride-Containing Pore Solution
- Authors
- Mandal, Soumen; Singh, Jitendra Kumar; Lee, Dong-Eun; Park, Taejoon
- Issue Date
- Aug-2020
- Publisher
- MDPI
- Keywords
- steel; concrete pore solution; corrosion; inhibitor; electrochemical impedance spectroscopy; Raman spectroscopy
- Citation
- MATERIALS, v.13, no.16, pp.1 - 24
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS
- Volume
- 13
- Number
- 16
- Start Page
- 1
- End Page
- 24
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/968
- DOI
- 10.3390/ma13163642
- ISSN
- 1996-1944
- Abstract
- In the present study, different contents, i.e., 1-3% of 0.5 M ammonium phosphate mono basic (APMB), were used as corrosion inhibitor to reduce the corrosion of steel rebar. Electrochemical impedance spectroscopy (EIS) results showed that up to 24 h of exposure, polarization resistance (R-p) and passive/oxide film resistance (R-o) gradually decreased in simulated concrete pore (SCP) + 3.5 wt.% NaCl solution owing to the reduction in pH of the solution. The steel rebar exposed in 2% inhibitor containing SCP + 3.5 wt.% NaCl solution exhibited 90% inhibition efficiency after 1 h of exposure. X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed the formation of thermodynamically very stable and sparingly soluble goethite (alpha-FeOOH), maghemite (gamma-Fe2O3), and iron phosphate (FePO4) as passive/oxide film onto the steel rebar surface exposed to 2% inhibitor containing SCP + 3.5 wt.% NaCl solution.
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Collections - COLLEGE OF ENGINEERING SCIENCES > DEPARTMENT OF ROBOT ENGINEERING > 1. Journal Articles
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