Synthesis, Structural, Density Functional Theory, and X-Ray Diffraction Study of Zn(II) N-Isopropylbenzyldithiocarbamate: Anti-Corrosion Screening in Acid Media

Noor Syafiqah Habdul Latif (Faculty of Applied Sciences, Universiti Teknologi MARA Negeri Sembilan Branch, Kuala Pilah Campus, 72000 Negeri Sembilan, Malaysia)
Sheikh Ahmad Izaddin Sheikh Mohd Ghazali (Faculty of Applied Sciences, Universiti Teknologi MARA Negeri Sembilan Branch, Kuala Pilah Campus, 72000 Negeri Sembilan, Malaysia)
Erna Normaya Abdullah (Experimental and Theoretical Research Laboratory, Department of Chemistry, Kulliyah of Science, International Islamic University Malaysia, Bandar Indera Mahkota, 25200 Kuantan, Pahang, Malaysia)
Azizul Hakim Lahuri (Department of Basic Science and Engineering, Faculty of Agriculture and Food Sciences, Universiti Putra Malaysia Bintulu, 97008 Sarawak, Malaysia)
Mohammad Fadzlee Ngatiman (Center for Research and Instrumentation Management (CRIM), Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia)
Nur Nadia Dzulkifli (Faculty of Applied Sciences, Universiti Teknologi MARA Negeri Sembilan Branch, Kuala Pilah Campus, 72000 Negeri Sembilan, Malaysia)

Indonesian Journal of Chemistry
Vol 18, No 4 (2018)

Corrosion of metal is a serious issue across many industries and is considered costly. Acids used during the cleaning process in industries may contribute to metal erosion. Dithiocarbamate is a ligand that can act as a corrosion inhibitor due to the presence of sulfur and nitrogen as electronegative atoms. Zn(II) N-isopropylbenzyldithiocarbamate (Zn[N-isopbenzdtc]2) complex was synthesized through direct synthetic method of < 4 °C and characterized using Fourier Transform Infrared-Attenuated Total Reflectance (FTIR-ATR), Ultraviolet-Visible (UV-Vis), Nuclear Magnetic Resonance (NMR), X-ray crystallography study, molar conductivity, melting point, and gravimetric analysis. Corrosion inhibition of mild steel was studied for different corrosive media (1 M HCl and 1 M H2SO4). The synthesized inhibitor was studied at different concentrations of 1, 2, 3, 4, and 5 mM at 40 °C. As a conclusion, as the inhibitor concentration decreased, the efficiency of the corrosion inhibitor also decreased at a constant temperature. In this study, it showed that the corrosion activity of mild steel in 1 M H2SO4 was higher compared to 1 M HCl due to the higher concentration of H+, which makes H2SO4 more corrosive than HCl.