Abstract
The analysis of the mixture of anthouse plant (Myrmecodia pendans) and red pepper vine (Piper ornatum) in H 2 SO 4 1M solution had been studied by weight loss, Electrochemical Impedance Spectroscopy (EIS), Fourier-Transform Infrared Spectroscopy (FTIR), and Spectrometer test. The Myrmecodia pendans and Piper ornatum were chosen because they contain antioxidants that can inhibit the corrosion rate. The specimen used in this study was API 5L Grade B steel in H2SO4 1M solution. The compositions used in this study were 100% MP : 0% PO, 75% MP : 25% PO, 50% MP : 50% PO, 25% MP : 75% PO, and 0% MP : 100% PO (MP: Myrmecodia pendans, PO: Piper ornatum). FTIR testing result shows that a passive layer was formed by O, H, and N bonds. The weight loss method shows that the highest efficiency of 52.43% was achieved by 50% MP : 50% PO mix composition. Polarization testing shows that the corrosion rate decreased drastically with the addition of 50% MP : 50% PO mix composition, i.e., from 36.32 mpy to 7.93 mpy, due to the passive layer formed on the steel surface. EIS results show the presence of resistance solution (Rs), charge transfer resistance (Rct), and CPE. The adsorption free energy value of the mixture of Myrmecodia pendans and Piper ornatum was −10.02 kJ/mol and it was a physical adsorption.
Highlights
Carbon steel is a material commonly used in various applications
Fourier-Transform Infrared Spectroscopy (FTIR) test was used to find the functional groups of O, N, and S that were located in the extract of anthouse plant and red pepper vine and to evaluate the bound that could be adsorbed on the specimen surface
The corrosion rate and inhibitor efficiency of anthouse plant and red pepper vine single extract in H2SO4 1M can be observed in the following results
Summary
Carbon steel is a material commonly used in various applications. For example, in the industrial world, the often-used carbon steel is API 5L grade B steel. API 5L grade B steel is applied in transportation of oil, water and natural gas. Based on the above research results, anthouse extract (Myrmecodia pendans) and red pepper vine extract (Piper ornatum) were mixed in this study to be analyzed as steel organic inhibitor in H2SO4 1M environment. The mixture compositions used in this research were 0% MP : 0% PO, 100% MP : 0% PO, 75% MP : 25% PO, 50% MP : 50% PO, 25% MP : 75% PO, and 0% MP : 100% PO, where MP is anthouse plant (Myrmecodia pendans) extract and PO is red pepper vine (Piper ornatum) extract. To evaluate the corrosion rate and the inhibitor efficiency of the anthouse plant – red pepper vine mixture, Electrochemical Impedance Spectroscopy (EIS), Polarization and weight loss tests were employed. The result of this research is hoped to encourage the mixture’s application in the industrial world as an environmentally friendly corrosion inhibitor alternative
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