Putri, Untari (2017) EKSTRAK DAUN MELINJO (Gnetum gnemon Linn.) SEBAGAI INHIBITOR KOROSI PADA BAJA DALAM LARUTAN ASAM. Diploma thesis, Universitas Andalas.
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Abstract
The use of melinjo leaf extracts (Gnetum gnemon Linn.) as a corrosion inhibitor for steel in medium HCl 1 N was investigated by the method of weight loss (weight loss), potentiodynamic polarization, spectrophotometric UV-VIS, and analysis of Scanning Electron Microscopy (SEM). The results show the inhibition efficiency was found to increase with increasing the concentration of the inhibitor. The maximum inhibition efficiency 91,35 % was observed in the presence of 10 g/L melinjo leaf extract. Inhibition efficiency increased with an increase in extract concentration and temperature. The adsorption process follows Langmuir isotherm. Potentiodynamic polarization measurements showed melinjo leaf extract is a type of anodic inhibitor. UV-Vis analysis showed the formation of a complex melinjo leaf extract with steel surface. Scanning Electron Microscopy analysis shows that there are differences in the morphology of the surface of steel were soaked in 1 N HCl medium with and without the addition of melinjo leaf extract. Keywords : Gnetum gnemon Linn., Corrosion inhibitors, Weight loss, Potentiodynamic polarization, SEM, Langmuir isotherm
Item Type: | Thesis (Diploma) |
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Primary Supervisor: | Prof.Dr. Emriadi |
Subjects: | Q Science > QD Chemistry |
Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Kimia |
Depositing User: | s1 kimia kimia |
Date Deposited: | 27 Apr 2017 03:03 |
Last Modified: | 27 Apr 2017 03:03 |
URI: | http://scholar.unand.ac.id/id/eprint/24527 |
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