Abstract
The effect of new corrosion inhibitors, namely N-(2-methoxyphenyl)-N’-(2-methylbenzoyl) thiourea (A1). N-(3-methoxyphenyl)-N’-(2-methylbenzoyl)thiourea (A2), N-(4-methoxyphenyl)-N’-(2-methylbenzoyl)thiourea (A3) and N-(2-methylbenzoyl)-N’-phenylthiourea (A4) on mild steel in 1.0 M H2SO4 with variation concentrations of inhibitors: 1 × 10−5, 1 × 10−4 and 1 × 10−3 M was tested by using weight loss method and linear polarization resistance (LPR) technique. These compounds were characterized using elemental analyser, FTIR, 1H and 13C NMR spectroscopy. Result obtained for IR showed the important bands of thiourea compound such as ν(N–H), ν(C=O), ν(C–N) and ν(C=S) which were observed around 3200, 1670, 1250 and 700 cm−1. The 1H chemical shifts for CONH and CSNH had been observed around 11 and 12 ppm respectively. For the 13C resonance, the signal of C=O and C=S had been observed at 180 and 206 ppm. The presence of the inhibitors significantly reduced the corrosion rate of the mild steel. The most promising inhibitors action is at 1 × 10−3 M and was achieved by compound A1 where the inhibition efficiency is 82.4–86.2 %. The effectiveness of the compounds was affected by the presence and absence of methoxy as the substituents in the compounds.
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Acknowledgment
The authors are grateful to the Ministry of Higher Education of Malaysia for the research grant no. 600-RMI/RAGS 5/3 (3/2012)and the Faculty of Applied Sciences, Institute of Science and Universiti Teknologi MARA for providing research facilities.
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Mustafa Kamal, N.K., Fadzil, A.H., Kassim, K. (2015). Synthesis, Characterization and Corrosion Inhibition Studies of 2-Methylbenzoylthiourea Derivatives. In: Hashim, M. (eds) ICGSCE 2014. Springer, Singapore. https://doi.org/10.1007/978-981-287-505-1_40
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DOI: https://doi.org/10.1007/978-981-287-505-1_40
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