Malaysian Journal of Analytical Sciences Vol 22 No 5 (2018): 758 - 767

SYNTHESIS, CHARACTERISATION AND EFFECT OF TEMPERATURE ON CORROSION INHIBITION BY THIOSEMICARBAZONE DERIVATIVES AND ITS TIN(IV) COMPLEXES

(Sintesis, Pencirian dan Kesan Suhu Perencat Kakisan oleh Ligan Terbitan Tiosemikarbazon dan Kompleks Timah(IV))

Nur Nadira Hazani^1,2, Nur Nadia Dzulkifli¹*, Sheikh Ahmad Izaddin Sheikh Mohd Ghazali¹, Yusairie Mohd², Yang Farina³, Nurul ‘Ain Jamion¹

¹Faculty of Applied Sciences,

Universiti Teknologi MARA, Kampus Kuala Pilah, 72000 Kuala Pilah, Negeri Sembilan, Malaysia

²Faculty of Applied Sciences,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia

³Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

*Corresponding author: nurnadia@ns.uitm.edu.my

Received: 29 August 2017; Accepted: 5 August 2018

Abstract

Thiosemicarbazone derivatives and its tin(IV) complexes used in this study were 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc), 2-acetylpyridine 4-methyl-3-thiosemicarbazone (HAcMTSc), 2-acetylpyridine 4-ethyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcETSc)PhenCl₂), and 2-acetylpyridine 4-methyl-3-thiosemicarbazone dichlorophenyltin (Sn(HAcMTSc)PhenCl₂). All these title compounds were characterised using an elemental analyser, Fourier-transform infrared-attenuated total reflectance spectroscopy (FTIR-ATR), ultraviolet-visible spectroscopy (UV-Vis), and nuclear magnetic resonance (NMR). The efficiency of the synthesised compounds as a corrosion inhibitor of mild steel in 1.0 M HCl was investigated using weight loss technique at different concentrations, 1, 2, and 3 mM, and at a temperature range of 30–60 °C. The thiosemicarbazone ligand and its tin(IV) complexes affirmed the hypothesis where the inhibitor efficiency tends to increase as the inhibitor concentration increases, indicating their potential use as a corrosion inhibitor for mild steel. Moreover, inhibitor efficiency decreases when temperature increases.

Keywords: thiosemicarbazone, corrosion inhibitor, temperature, mild steel

Abstrak

Terbitan tiosemikarbazon dan kompleks timah(IV) yang digunakan dalam kajian ini adalah 2-asetilpiridina 4-etil-3-tiosemikarbazon (HAcETSc), 2-asetilpiridina 4-metil-3-tiosemikarbazon (HAcMTSc), 2-asetilpiridina 4-etil-3-tiosemikarbazon dikloridastanum (Sn(HAcETSc)PhenCl₂) and 2-asetilpiridina 4-metil-3-tiosemikarbazon dikloridastanum (Sn(HAcMTSc)PhenCl₂). Kesemua sebatian telah dicirikan menggunakan analisis unsur, spektroskopi inframerah transformasi Fourier-pantulan keseluruhan dikecilkan (FTIR-ATR), spektroskopi ultralembayung-sinar nampak (UV-Vis) dan resonans magnetik nuklear (NMR). Kecekapan sebatian yang telah disintesis dikaji sebagai perencat kakisan terhadap keluli lembut dalam 1.0 M HCl dengan kepekatan berbeza, 1, 2, dan 3 mM, serta suhu antara 30-60 °C menggunakan kaedah kesusutan berat. Ligan tiosemikarbazon dan kompleks timah(IV) membuktikan hipotesis di mana kecekapan perencat cenderung untuk meningkat apabila kepekatan perencat meningkat, menunjukkan ia berpotensi untuk digunakan sebagai perencat kakisan terhadap keluli lembut. Tambahan lagi, kecekapan perencat menurun apabila suhu meningkat.

Kata kunci: tiosemikarbazon, perencatan kakisan, suhu, keluli lembut

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