The Effect of Transformation on 1-Methylimidazole into 1-(2-Aminoethyl)-3-Methylimidazolium Bromide towards the Corrosion Inhibition Activity on Carbon Steel in 1% (w/v) NaCl Environment
Corrosion is a phenomenon which is harmful and generally happened in industry, especially in oil and gas industry. Carbon steel is a common material that is used as a pipeline because the cost is relatively cheap and has a good mechanical properties. However, carbon steel is easily corroded due to t...
Saved in:
| Main Author: | |
|---|---|
| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/32266 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Corrosion is a phenomenon which is harmful and generally happened in industry, especially in oil and gas industry. Carbon steel is a common material that is used as a pipeline because the cost is relatively cheap and has a good mechanical properties. However, carbon steel is easily corroded due to the fluid stream containing dissolved H2S and CO2 gas. Corrosion on the inner surface of the pipeline could be inhibited by injection corrosion inhibitor (chemical injection) into the fluid flow. Corrosion inhibitors from organic compound are known has a good corrosion inhibition activity. In this study, the functional group transformation on 1-methylimidazole (compound 1) has been carried out into ionic liquid 1-(2-aminoethyl)-3-methylimidazolium bromide or [AEMIM]Br (ionic liquid 2). The functional group transformation was done by reacting 1-methylimidazole with 2-bromoethylamine and synthesized using Microwave-Assisted Organic Synthesis (MAOS) method at 50 oC with 300 Watt radiation for 21 minutes and magnetic stirrer. Ionic liquid 2 was obtained as a yellow viscous liquid with a yield of 92.66% and has a melting point 51 oC. Ionic liquid 2 was analyzed through the TLC test using 5 different eluents and showed that has a different spot with reactant. FTIR spectrum showed primary amine vibration peak at 3515 cm-1. Mass spectroscopy analysis of ionic liquid 2 utilizing HRMS TOF MS ES+ showed relative molecular mass peak at 126.1036 and fit with ionic liquid 2’s cation molecular formula, C6H12N3. 1H-NMR dan 13C-NMR spectrums in MeOH-d4 solvent confirmed that ionic liquid 2 was succesfully synthesized. Corrosion inhibition test on 1 and ionic liquid 2 was done using electrochemistry methods, Electrochemical Impedance Spectroscopy (EIS) and potensiodynamic polarization (Tafel). The maximum inhibition efficiency of 1 was obtained at 30 oC and the concentration of 25 ppm, which is 9.32% with EIS method, while ionic liquid 2 reached its maximum at 30 oC and the concentration of 100 ppm, which is 25.76% with EIS method, and 43.80% with Tafel method. Adsorption free energy of ionic liquid 2 has a range from -33.76 to 24.75 kJ/mol, which is indicating that adsorption of ionic liquid 2 is semi-physics adsorption or semi-chemisorption. The shift of corrosion potential showed that ionic liquid 2 is mixed/ohmic inhibitor. The functional group transformation of compound 1 into ionic liquid 2 affected the increase in the corrosion inhibition nature of ionic liquid 2 compared to 1 towards carbon steel in 1% (w/v) NaCl environment. |
|---|