EKSTRAK DAUN MELINJO (Gnetum gnemon Linn.) SEBAGAI INHIBITOR KOROSI PADA BAJA DALAM LARUTAN ASAM
| Main Author: | Putri, Untari |
|---|---|
| Format: | Thesis NonPeerReviewed Book |
| Bahasa: | ind |
| Terbitan: |
, 2017
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| Subjects: | |
| Online Access: |
http://scholar.unand.ac.id/24527/2/BAB%20I%20Pendahuluan.pdf http://scholar.unand.ac.id/24527/3/BAB%20Akhir%20.pdf http://scholar.unand.ac.id/24527/4/DAFTAR%20PUSTAKA.pdf http://scholar.unand.ac.id/24527/5/Cover%20dan%20Abstrak.pdf http://scholar.unand.ac.id/24527/6/Skripsi%20full%20text.pdf http://scholar.unand.ac.id/24527/ |
Daftar Isi:
- 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