AISHA, FILDA (2014) EKSTRAK DAUN SAWO (Manilkara zapota L.) SEBAGAI INHIBITOR KOROSI BAJA St.37 DALAM MEDIUM ASAM KLORIDA. Other thesis, ANDALAS UNIVERSITY.
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Abstract
ABSTRACT SAPODILLA LEAVES EXTRACT (Manilkara zapota L.) AS CORROSION INHIBITOR OF St.37 STEEL IN HYDROCHLORIC ACID MEDIUM By: FILDA AISHA (BP : 1010412012) Prof. Dr. Emriadi, MS dan Yeni Stiadi, MS Corrosion inhibition of St.37 steel in hydrochloric acid medium by sapodilla (Manilkara zapota L.) leaves extract was investigated using weight loss measurement and potentiodynamic polarization. Results show that the inhibition efficiency increases with increasing concentration of the extract and decreases with increasing temperature. The inhibition efficiencies which were obtained using optimum extract concentration were 81,24% by weight loss method and 85,52 % by potentiodynamic polarization method. Potentiodynamic polarization method showed that sapodilla leaves extract decrease corrosion current and increase inhibition efficiency. Inhibitive effect was afforded by adsorption of the extract on steel surface which was found to accord with Langmuir adsorption isotherm. FTIR and photo optic confirmed the existence of the adsorbed protective film on the steel surface. Keywords: corrosion inhibition, Manilkara zapota L., adsorption, potentiodynamic polarization, Langmuir adsorption isotherm.
| Item Type: | Thesis (Other) |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Unit atau Lembaga: | Fakultas MIPA > Kimia Pascasarjana > Doktor > Fakultas MIPA > Kimia Fakultas MIPA > Kimia |
| Depositing User: | Marina R kurniawan |
| Date Deposited: | 29 Jan 2015 00:58 |
| Last Modified: | 29 Jan 2015 00:58 |
| URI: | http://repository.unand.ac.id/id/eprint/22025 |
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