Abstract
Corrosion of a material by reaction with a corrosive environment is a common problem across many industries. Iraq is an oil country and corrosion represents a large portion of the total costs for oil producing and a natural potential hazard associated with oil production and transportation. The synthesis of novel thiosemicarbazone, namely 2-(2,4-dimethoxybenzylidene)hydrazinecarbothioamide (DMBHC), was conducted and the chemical structure was elucidated via the 1H and 13C NMR (Nuclear magnetic resonance), and FT-IR (Fourier-transform infrared) spectroscopic spectroscopic techniques in addition to carbon, hydrogen, and nitrogen analyses (CHN analyses). The inhibition properties of the investigated thiosemicarbazone were evaluated for mild steel (MS) corrosion in 1N H2SO4 using electrochemical impedance spectroscopy (EIS), weight loss method, and scanning electron microscopy (SEM). Electrochemical and weight loss techniques revealed that the tested thiosemicarbazone acted as a superior inhibitor for the acidic corrosion of MS and the efficiency increased with increasing concentrations. The EIS results revealed that thiosemicarbazone demonstrated the highest inhibition efficiency of 94.86%, at a concentration of 0.5 mM. Results from the weight loss technique suggested that the thiosemicarbazone acted as a mixed type corrosion inhibitor. The impact of temperature on the mechanism of inhibition of the new synthesized inhibitor of the surface of MS in 1N H2SO4 was investigated at various temperatures (30–60 °C) where the inhibitive efficiency diminished with increasing temperatures. The mechanism of inhibition was additionally verified with the methodological data.
Highlights
Mild steel contains a large proportion of the element iron, which has a wide application in industries, constructional materials, and machines due to its low cost and superior mechanical properties despite its tendency to corrode in aquatic environments, especially in acid solutions [1,2,3]
[32,33,34,35,36], we report on the synthesis and characterization of a new inhibitor derived from characterization of a new inhibitor derived from thiosemicarbazide
The reaction sequences for the synthesis of a new corrosion inhibitor starting from thiosemicarbazide are outlined in Scheme 2
Summary
Mild steel contains a large proportion of the element iron, which has a wide application in industries, constructional materials, and machines due to its low cost and superior mechanical properties despite its tendency to corrode in aquatic environments, especially in acid solutions [1,2,3]. Corrosions of mild steel and other alloy surfaces in corrosive environments (sulfuric acid) are typical uniform corrosion examples [4]. The acidic environment, especially sulfuric and hydrochloric acids, is widely used in industrial fields such as pickling and cleaning operations as well as the use of citrus in boilers for de-sedimentation as well as the acidification of oil drilling in oil wells. H2 SO4 is utilized as a pickling solution for steel alloys [7].
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