Corrosion Inhibition Of Aquilaria Methanolic Leaf Extracts For Mild Steel In Hydrochloric Acid Solution

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dc.contributor.authorLee, Helen Yun Sin
dc.date.accessioned2019-03-07T02:00:54Z
dc.date.available2019-03-07T02:00:54Z
dc.date.issued2018-04
dc.description.abstractCorrosion is a problem that negatively affects many industries and causes these industries monetary losses. Many synthetic inhibitors were developed to overcome the corrosion problem. However, these synthetic inhibitors are harmful to human and the environment. In this study, the methanolic leaf extracts of Aquilaria malaccensis (noninoculated) and Aquilaria subintegra (non-inoculated, chemical inoculated, physical inoculated) leaf were investigated as green and sustainable corrosion inhibitors for mild steel in 1 M HCl solution. From the quadrupole-time of flight liquid chromatography/mass spectrometry (Q-TOF LC/MS) analysis, choline, isoleucine, adenosine, phenylalanine and mangiferin were confirmed to be present. The leaf extracts and the standard compounds were applied as corrosion inhibitors for mild steel in 1 M HCl solution. Overall, the leaf extracts were shown to have good corrosion inhibition efficiency of up to 96 % at the concentration of 1500 ppm from the anticorrosion measurements namely the electrochemical impedance spectroscopy (EIS) measurement, the potentiodynamic polarisation measurement and the weight loss study. Among the studied leaf extracts, the leaf extract of Aquilaria malaccensis seems to be overall the best as corrosion inhibitor. It was found that there were no relation between the inhibition efficiencies and the treatment of the tree (inoculated or noninoculated). The standard compounds had various corrosion inhibition abilities and adenosine was found to be the best corrosion inhibitor among the tested standard compounds. The leaf extracts best fitted into the modified Langmuir adsorption isotherm model and adsorbed by mixed-type but predominantly physisorption process.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/7851
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectCorrosion inhibition of aquilaria methanolic leaf extractsen_US
dc.subjectmild steel in hydrochloric acid solutionen_US
dc.titleCorrosion Inhibition Of Aquilaria Methanolic Leaf Extracts For Mild Steel In Hydrochloric Acid Solutionen_US
dc.typeThesisen_US
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