Characterization of Water Hyacinth Extract by Vacuum Microwave Assisted Extraction (VMAE) Method for Corrosion Inhibitor on ASTM A36 Plate in 1 M H2SO4 Environment Tifa Paramitha (a), Unung Leoanggraini (a), Dava Maulana Malik (a), Angely Luviana (a), Angelina Putri (a), Santy Nurhasanah (a), Shafira Salsabila (a), dan Rony Pasonang Sihombing(a*)
a) Chemical Engineering, Politeknik Negeri Bandung, Jl. Gegerkalong Hilir, Bandung Barat 40559, Indonesia
*rony.pasonang.sihombing[at]polban.ac.id
Abstract
Water hyacinth is a plant that is very abundant in Indonesia. One of the utilizations of water hyacinth is for corrosion inhibitors. The type of media applied in this research is an acidic media, which is H2SO4 solution. The purpose of this research is to investigate the application of water hyacinth extract for inhibitor corrosion. The extract was obtained by VMAE method at 300 watts power for 8-, 10-, and 15-minutes using ethanol solvent. The ratio of feed and solvent used was 1:15 (b/v). Then, extract was analyzed by Gas Chromatography-Mass Spectrometry (GC-MS) and tested to phytochemical tests using Dragendroff, Wagner and Mayer reagents. After that, the extract was applied as inhibitor corrosion on ASTM A36 Plate. Based on the results of extract analysis, terpenoid and phenol compounds was detected on water hyacinth extract, in which these two compounds are antioxidant substances that can be utilized as corrosion inhibitors. The results of the corrosion study showed that the lowest corrosion rate was obtained at a concentration of 2000 ppm, namely 9,396 mmpy. Metal samples were subjected to qualitative tests using SEM-EDX and XRD. From these tests, the amount of Fe content decrease and the formation of crystalline phases such as Fe24N10 were obtained.
Keywords: Water Hyacinth, VMAE, corrosion inhibitor
