Dalam kajian ini, perencatan kakisan aluminium dalam 1.0 M larutan asid hidroklorik dengan ekstrak daun Moringa oleifera telah dikaji dengan menggunakan kaedah penurunan berat. Kesan suhu dan kepekatan asid ke atas tingkah laku kakisan aluminium dalam 1.0 M HCl dengan penambahan ekstrak juga dikaji. Perencatan didapati meningkat dengan peningkatan kepekatan ekstrak. Juga, perencatan didapati berkurangan dengan peningkatan suhu asid. Penjerapan ekstrak di atas permukaan aluminium taat kepada penjerapan isoterma Langmuir. Nilai kecekapan perencatan dikira dari kaedah penurunan berat memberi nilai yang memuaskan. Tenaga bebas Gibbs untuk proses perencatan tersebut telah dikira. Filem terjerap pada permukaan aluminium yang mengandungi M. oleifera daun ekstrak juga diukur oleh Gas Chromatography Mass Spektrometri (GCMS) dan Fourier Transform Infrared Spektroskopi (FTIR). Keputusan yang diperolehi menunjukkan sebatian yang bertanggungjawab bagi perencatan kakisan, yang merupakan sebatian quercetin, dan ini menunjukkan bahawa ekstrak M. oleifera boleh menjadi perencat berkesan daripada kakisan aluminium dalam media asid hidroklorik.
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In this research, the inhibition of the corrosion of aluminium in 1.0 M hydrochloric acid solution by the leaves extract of Moringa oleifera has been studied using weight loss method. The effect of temperature of acid, and extract concentration on the corrosion behavior of aluminium in 1.0 M HCl with addition of extract was also studied. Inhibition was found to increase with increasing concentration of the extract. Also, inhibition was found to decrease with increasing temperature of the acid. The adsorption of the extract on the aluminium surface obeyed the Langmuir adsorption isotherm. Values of inhibition efficiency calculated from weight loss are in good agreement. The Gibbs free energy for the inhibition process was calculated. The adsorbed film on aluminium surface containing M. oleifera leaves extract was also measured by Gas Chromatography Mass Spectrometry (GCMS) and Fourier Transform Infrared Spectroscopy (FTIR). The results obtained revealed the compound responsible for the corrosion inhibition, which is quercetin compound, and this showed that the M. oleifera extract could serve as effective inhibitor of the corrosion of aluminium in hydrochloric acid media.
Use of moringa oleifera leaf extract as green corrosion inhibitor for aluminium in 1.0 M of hydrochloric acid / Kavitrra Rajendram