Corrosion inhibition performance of Manihot esculenta (CASSAVA) leaves extract on aluminium in 1M hcl solution
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Date
2019-06
Authors
Nur Syafiqah Nasrin Binti Ismail
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Abstract
This study has been proposed in order to investigate the corrosion inhibition of aluminium
in 1M HCl by using Manihot esculenta (cassava leaves) extract. Inhibition of aluminium
corrosion using M. esculenta leaves extract in 1M HCl was investigated by using weight
loss analysis at various concentrations of inhibitor, temperatures and immersion times.
Addition of halide ion to the inhibited system was also introduced in order to identify the
synergistic or antagonistic effect towards the inhibition efficiency. The potentiality of M.
esculenta leaves extract to inhibit corrosion was studied based on concentration of
inhibitors at range of 0.2g/L-1.0g/L, temperature range of 30°C-60 °C and immersion time
range of 24-96 hour. The optimum conditions for the inhibition were obtained at 0.6g/L of
inhibitor concentration at 30 °C in 24 hours. Addition of halide ions to the inhibited system
showed synergistic effect and has increased the inhibition efficiency (13.5 % increment).
Thermodynamics and kinetics parameters (activation energy, enthalpy of activation and
entropy of activation) were calculated and discussed. The adsorption of M. esculenta leaves
extract onto the aluminium surface was found to obey the Langmuir adsorption isotherm.
Characterization of sample via Fourier Transform Infrared (FTIR) and Gas
Chromatography–Mass Spectrometry (GCMS) were introduced to determine the functional
group absorbed on the aluminium surface and the compound presence in M. esculenta.
FTIR analysis results show M. esculenta leaves extract contains O and N atoms in
functional groups aromatic ring, which meets the general structural consideration of the
corrosion inhibitor. For GCMS analysis results, the class of compound presence in M. esculenta leaves extract were aliphatic alcohol, carboxylic acid, phenolic compound, fatty
acid, methyl linolenate and acyclic diterpene alcohol which help to inhibit the corrosion.