A biopolymer
from tragacanth gum, arabinogalactan (AG), was investigated
for its adsorption and corrosion inhibition traits for carbon steel
corrosion in 1 M HCl. Gravimetric method, potentiodynamic polarization
measurements, electrochemical impedance spectroscopy, UV–visible
spectroscopy, scanning electron microscopy, and atomic force microscopy
were used to judge the adsorptive nature of AG in the acid solution.
The inhibition efficiency improved with an increase in AG concentration
and temperature of the acid solution. Thermodynamic and activation
parameters (Δ
G
ads
,
E
a
, Δ
H
, and Δ
S
) were also calculated and discussed. The adsorption of AG favored
Langmuir adsorption isotherm. The results of corrosion tests confirmed
that AG could serve as an efficient green corrosion inhibitor for
the carbon steel in 1 M HCl, yielding high efficiency and a low risk
of environmental pollution. Theoretical quantum chemical and Monte
Carlo simulation studies corroborated the experimental results.
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