Ammonium Phosphate as Inhibitor to Mitigate the Corrosion of Steel Rebar in Chloride Contaminated Concrete Pore Solution
- Title
- Ammonium Phosphate as Inhibitor to Mitigate the Corrosion of Steel Rebar in Chloride Contaminated Concrete Pore Solution
- Author
- 박태준
- Keywords
- steel; corrosion; inhibitor; concrete; potentiodynamic polarization; electrochemical impedance spectroscopy; scanning electron microscopy; raman spectroscopy
- Issue Date
- 2020-08
- Publisher
- MDPI AG
- Citation
- MOLECULES, v. 25, no. 17, Article no. 3785, 22pp
- Abstract
- In the present study, different amounts, i.e., 1-3v/v% of 1 M ammonium phosphate monobasic, were used as an eco-friendly corrosion inhibitor to mitigate the corrosion of steel rebar exposed to simulated concrete pore (SCP) + 3.5 wt% NaCl solution at a prolonged duration. Potentiodynamic polarization results show that as the amount of inhibitor is increased, the corrosion resistance of steel rebar is increased. The steel rebar exposed to 3% inhibitor-containing SCP + 3.5 wt% NaCl solution exhibited nobler corrosion potential (E-corr), the lowest corrosion current density (i(corr)), and 97.62% corrosion inhibition efficiency after 1 h of exposure. The steel rebars exposed to 3% inhibitor-containing SCP + 3.5 wt% NaCl solution revealed higher polarization resistance (R-p) and film resistance (R-o) with exposure periods compared to other samples owing to the formation of passive film. The scanning electron microscopy (SEM) of steel rebar exposed to 3% inhibitor-containing SCP + 3.5 wt% NaCl solution showed homogenous and uniform dendritic passive film which covers all over the surface, whereas, bare, i.e., SCP + 3.5 wt% NaCl solution exposed samples exhibited pitting and irregular morphology. Raman spectroscopy results confirm the formation of goethite (alpha-FeOOH), maghemite (gamma-Fe2O3), and iron phosphate (FePO4) as a passive film onto the steel rebar surface exposed to 3% inhibitor-containing SCP + 3.5 wt% NaCl solution. These phases are responsible for the corrosion mitigation of steel rebar which are very protective, adherent, and sparingly soluble.
- URI
- http://eds.b.ebscohost.com/eds/detail/detail?vid=0&sid=9f83bae6-7869-4f36-8bed-ec8f6504eba1%40sessionmgr101&bdata=Jmxhbmc9a28mc2l0ZT1lZHMtbGl2ZQ%3d%3d#AN=edselc.2-52.0-85089794200&db=edselchttps://repository.hanyang.ac.kr/handle/20.500.11754/164706
- ISSN
- 1420-3049
- DOI
- 10.3390/molecules25173785
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ROBOT ENGINEERING(로봇공학과) > Articles
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