Malaysian Journal of Analytical Sciences Vol 18 No 1 (2014): 21 – 27

 

 

 

SYNTHESIS, CHARACTERIZATION AND CORROSION INHIBITION STUDIES OF o,m,p-DECANOYL THIOUREA DERIVATIVES ON MILD STEEL IN 0.1 M H₂SO₄ SOLUTIONS

 

(Sintesis, Pencirian dan Kajian Perencatan Kakisan Keluli Lembut oleh Terbitan o,m,p-Dekanoil Tiourea Dalam 0.1 M Larutan H₂SO₄ )

 

Noor Khadijah Mustafa Kamal¹, Adibatul Husna Fadzil¹*, Karimah Kassim^1,2, Shadatul Hanom Rashid¹,

Mohd Sufri Mastuli¹

 

¹Faculty of Applied Sciences,

²Institute of Science,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

 

*Corresponding author: adibatul@salam.uitm.edu.my

 

 

Abstract

A series of decanoyl thiourea derivatives, namely N-decanoyl-N’-2-pyridinethiourea (D1), N-decanoyl-N’-3-pyridinethiourea (D2) and N-decanoyl-N’-4-pyridinethiourea (D3) were successfully synthesized and were applied as corrosion inhibitors. The compounds were characterized via elemental analyser, Fourier Transform Infra Red (FTIR) and ¹H and ¹³C Nuclear Magnetic Resonance (NMR) spectroscopies. The inhibition efficiency of each compound was studied on the corrosion of mild steel in 0.1 M H₂SO₄ with different concentrations of the compounds by using weight loss method and linear polarization resistance technique. From both techniques the results indicate that the corrosion process was significantly reduced with the presence of such compounds. It shows that compound D3 has the highest efficiency which is 85.84% compared to D1 and D2. The effects of position of N atom located at ortho, meta and para in chemical structure of pyridine on the corrosion inhibition efficiencies of the compounds were also investigated. 

 

Keywords: Corrosion inhibitor, spectroscopic studies, corrosion studies, inhibition efficiency

 

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