Corrosion Inhibition of Sodium Silicate with Nanosilica as Coating in Pre-Corroded Steel

Marish S. Madlangbayan, Carlo Nico B. Diola, Alvin Karlo G. Tapia, Milagros M. Peralta, Engelbert K. Peralta, Ronaniel A. Almeda, Maris Asuncion L. Bayhon, Marloe B. Sundo

Abstract


This study was conducted to investigate the potential of using sodium silicate with nanosilica as a treatment to inhibit the progress of corrosion in steel specimens that are already corroded. Steel specimens measuring 16 mm in diameter and 4 mm in thickness were prepared and subjected to pre-corrosion by immersion to 3.5% NaCl solution. Two sets of specimens were then dip-coated with sodium silicate containing nanosilica. One set was coated with 1% nanosilica, and the other was coated with 2.5% nanosilica. The coated specimens were then subjected to Complex Impedance Spectroscopy (CIS) at 20 Hz to 20 MHz frequency range. Compared with the sodium silicate coating with 1% nanosilica, the sodium silicate coating with 2.5% nanosilica had a larger semi-circle curve in the Nyquist plot. Similarly, the sodium silicate coating with 2.5% nanosilica also showed larger magnitudes of impedance at the low-frequency region and larger phase angles at the high-frequency regions in the Bode plot. These results imply that the sodium silicate coating with 2.5% nanosilica coating demonstrated better capacitive behavior. In addition, equivalent circuit modelling results also showed that the sodium silicate coating with 2.5% nanosilica had higher coating resistance and lower coating capacitance as compared to the sodium silicate coating with 1% nanosilica.

 

Doi: 10.28991/cej-2021-03091761

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Keywords


Corrosion; Coating; Nanosilica; Impedance Spectroscopy.

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DOI: 10.28991/cej-2021-03091761

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Copyright (c) 2021 Marish Madlangbayan, Carlo Nico Diola, Alvin Karlo Tapia, Milagros Peralta, Engelbert Peralta, Ronaniel Almeda, Maris Asuncion Bayhon, Marloe Sundo

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