(Curcumin-Like), synthesized, characterization, EIS, Tafel, inhibition efficiency

• Main Author: Peridoti Purwaman, Bella
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32197
• Institution: Institut Teknologi Bandung

Corrosion occurred at the inner-part of carbon steel pipelines for oil/natural gas distribution is a major problem in the oil and gas industry. To reduce the corrosion rate, corrosion inhibitors were used at certain concentrations and continuously injected along with the fluid flow through the pipelines. In this study, two curcumin-like compounds, namely 1,5-bis-(4-methoxyphenyl)-penta-1,4-dien-3-one (1) and sodium salt of (E)-6-(4-methoxy-phenil)-4-oxo-hexa-1,5-dien-2-olate (2) were synthesized to be used as corrosion inhibitors of carbon steel at 1% NaCl environment. Compounds 1 and 2 were synthesized by reacting 4-methoxybenzaldehyde with acetone and 4-methoxybenzaldehyde with acetylacetone, respectively, at room temperature for 10 minutes. Structure of compound 1 and 2 were confirmed by the measurements of FTIR, 1H-NMR, 13C-NMR, and LC-MS spectroscopies. Based on the analysis of 13C-NMR spectra, the compound 1 contained a ketone group (?: 189 ppm) and benzene moieties (?: 114-127 ppm), while the compound 2 contained a conjugated ketone group (?: 191 ppm) and benzene moiety (?: 114-128 ppm). The corrosion inhibition efficiency tests of compounds 1 and 2 were conducted using EIS and Tafel methods at temperature of 45 °C in medium of 1% NaCl. The maximum inhibition efficiency of compound 1 at a concentration of 4 ppm by 41,29% at 45? and compound 2 at a concentration of 2,5 ppm was 87,31% at 65?. Based on the results of Tafel measurements, compound 1 is an ohmic inhibitor (mixed inhibitor), whereas compound 2 is a cathodic inhibitor.