EKSTRAK DAUN MELINJO (Gnetum gnemon Linn.) SEBAGAI INHIBITOR KOROSI PADA BAJA DALAM LARUTAN ASAM

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

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