Publication: Corrosion inhibition and adsorption mechanism studies of dillenia suffruticosa leaves extract as a green corrosion inhibitor for aluminium in acidic solution
| datacite.subject.fos | oecd::Engineering and technology::Chemical engineering | |
| dc.contributor.author | Nur Allia Binti Asri | |
| dc.date.accessioned | 2025-05-13T04:58:28Z | |
| dc.date.available | 2025-05-13T04:58:28Z | |
| dc.date.issued | 2023-01-01 | |
| dc.description.abstract | The use of corrosion inhibitors for aluminium in an acidic medium proved to reduce the corrosion effect of an aggressive environment on aluminium and its alloys. However, the toxicity and health hazards posed by the commercial inhibitors have drawn the attention of the researchers to find alternative greener and safer corrosion inhibitors. Therefore, this work aims to study the performance of the Dillenia suffruticosa leaves extract in hindering the corrosion effect of 1.0 M HCl solution on aluminium. The extraction of D. suffruticosa leaves was done using the Soxhlet extraction technique with ethanol as the extracting solvent. The characterization of the leaves extract by Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry analyses confirmed the presence of bioactive compounds with nitrogen and oxygen heteroatoms in the functional groups. The D. suffruticosa leaves extract possessed high total phenolic content (221.56 mg GAE/g extracts and antioxidant activity with IC50 of 154.97 μg/mL. The maximum inhibition efficiency (% IE) of D. suffruticosa leaves extract obtained from weight loss measurement was 80.79 ± 2.54% when the extract concentration of 0.8 g/L at 30 °C in 2 hours of immersion time was used. The optimization of the process parameters for corrosion inhibition of D. suffruticosa leaves extract was conducted using Response Surface Methodology via Central Composite design. The maximum predicted inhibition efficiency of 76.94 % with a predicted corrosion rate of 67.52 mm/year was achieved under the optimum extract concentration of 0.8 g/L, immersion time of 2 hours at a temperature of 30 °C. The electrochemical measurement of D. suffruticosa leaves extract as corrosion inhibitor for aluminium in 1.0 M HCl was conducted under optimized conditions. In the open circuit potential (OCP) measurement, the OCP value of aluminium in 1.0 M HCl solution with the addition of D. suffruticosa leaves extract (-0.763 V) was more positive compared to aluminium in blank HCl (-0.788 V). The galvanic current density of aluminium in the inhibited solution (0.0167 μA/cm-2) was also lower than the aluminium in the blank HCl solution (0.0239 μA/cm-2). In potentiodynamic polarization measurement, the corrosion current density (Icorr) of aluminium was reduced from 5214.7 μA/cm-2 to 220.04 μA/cm-2 in the inhibited HCl with an inhibition efficiency of 95.78%. The addition of potassium iodide (KI) to the inhibited HCl solution improved the %IE of D. suffruticosa leaves extract from 80.79 % to 92.74% with 10 mM of KI. The corrosion inhibition performance by the extract obeyed the Langmuir adsorption isotherm model as indicated by the monolayer adsorption of the leaves extract on the aluminium surface. The findings from this study have proven the ability of D. suffruticosa leaves extract to inhibit corrosion of aluminium in HCl solution. | |
| dc.identifier.uri | https://erepo.usm.my/handle/123456789/21602 | |
| dc.language.iso | en | |
| dc.title | Corrosion inhibition and adsorption mechanism studies of dillenia suffruticosa leaves extract as a green corrosion inhibitor for aluminium in acidic solution | |
| dc.type | Resource Types::text::thesis::master thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | Universiti Sains Malaysia |