EKSTRAK DAUN JAMBU AIR (Syzygium samarangense) SEBAGAI INHIBITOR KOROSI PADA BAJA DALAM LARUTAN ASAM

Apriwanda, Apriwanda (2017) EKSTRAK DAUN JAMBU AIR (Syzygium samarangense) SEBAGAI INHIBITOR KOROSI PADA BAJA DALAM LARUTAN ASAM. Diploma thesis, Universitas Andalas.

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Abstract

Extracts Jambu Air (Syzygium samarangense) leaves as a corrosion inhibitor for steel in HCl 1 N has been investigated. corrosion inhibition of jambu air leaves extract was investigated by weight loss method, potentiodynamic polarization, UV-VIS spectrophotometric analysis, Fourier Transform Infrared spectroscopy (FTIR) and characterization by Scanning Electron Microscopy (SEM).Based on weight loss method obtained rate of corrosion and inhibition efficiency increased with increasing tempature and addition of jambu air leaves extract. The highest inhibition efficiency that is 80.34% on addition of 10 g/L extract of jambu air leaves. FTIR showed that jambu air leaves extract had interacted with the surface of the steel was characterized by peak shift functional groups of compounds from the extracts. Potentiodynamic polarization measurements indicated the type of jambu air leaves extract inhibitor was mixture inhibitor. Jambu air leaves extract adsorption on the steel surface according to the Langmuir isotherm. Characterized by Scanning Electron Microscopy showed a difference of steel surfaces immersed in 1 N HCl medium with and without the addition extract of jambu air leaves. Keywords :Syzygium samarangense., Corrosion inhibitors, Weight loss,Potentiodynamic polarization, SEM, Langmuir isotherm.

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