Electrodeposition
and corrosion behavior of Sn and Sn-reduced graphene oxide coatings on mild steel
from the non-cyanide acid chloride bath solution
Dharanendra R.A., Bhavana R., Sreenivasa S., Aruna Kumar D.B. and Shet Prakash M.
Res. J. Chem. Environ; Vol. 27(8); 1-7;
doi: https://doi.org/10.25303/2708rjce0107; (2023)
Abstract
Reduced graphene oxide (rGO) derived from graphite has received attention among
researchers because of its special unique characteristic properties. Based on the
studies, rGO-based coatings on stainless steel (SS) act as an anti-corrosive protective
coating on stainless steel. Herein, we prepared a few layered rGO via graphite oxide
by a simple thermal exfoliation of graphite oxide. Tin and Sn-rGO coatings have
been electrodeposited on SS using an optimized acid chloride bath composition in
the absence and presence of rGO respectively. The prepared specimens were subjected
to an aggressive corrosive environment (aqueous 5% NaCl). The corrosion behavior
of Sn and Sn-rGO composite coating has been examined by potentiodynamic polarization
and electrochemical impedance spectroscopic (EIS) techniques.
The potential shifted towards the negative region after polarization for Sn-rGO
composite coating compared to pure Sn coating. Also, Sn-rGO composite coating exhibits
more resistance when subjected to EIS measurements in 5% NaCl. The change in the
surface morphology of coatings before and after exposure to corrosive environments
has been observed by Scanning electron microscopy. After exposure to aqueous 5%
NaCl, Sn coated specimen exhibited pores on the SS surface whereas fewer pore structures
were observed on the SS surface for Sn-rGO coating. The results reveal a significant
increase in anti-corrosion properties of Sn-rGO on SS compared to that of pure Sn
coating.
