Corrosion Inhibition Performance of the Synergistic Effect of Rosmarinus officinalis and 5-Bromovanillin on 1018 Carbon Steel in Dilute Acid Media
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The corrosion inhibition effect of environmentally
friendly organic admixture of Rosmarinus
officinalis and 5-bromovanillin on 1018 carbon steel in 1 M
HCl and H2SO4 solution was assessed through potentiodynamic
polarization, coupon measurement, optical
microscopy and ATF-FTIR spectroscopy. Experimental
data show that the compound performed more effectively
in HCl solution with maximum inhibition efficiency 92.57
and 94% in comparison with 64.57 and 64.55% in H2SO4
from electrochemical analysis due to film formation and
chemisorption adsorption of the compound. Functional
groups of amines, amides, H–bonded alcohols and phenols,
C–H stretch alkanes, alkynes and C–C stretch in-ring aromatics
identified through ATF-FTIR spectroscopy
completely adsorbed on the steel surface in HCl, but partially
in H2SO4 as shown in the decreased peak intensity.
Thermodynamic calculations showed the cationic adsorption
to be through chemisorption and physiochemical
mechanism according to Langmuir, Freundlich and Temkin
adsorption isotherms. Images from optical microscopy
showed a well-protected surface morphology of the
inhibited steel in comparison with images from the corroded
stainless steel. Severe surface deterioration and
macropits were observed in the uninhibited samples. The
inhibition property of the organic compound was determined
to be mixed type.
Keywords
T Technology (General), TJ Mechanical engineering and machinery