Illuminating of mild steel/HCI interface in the presence of 5-DAT inhibitor

Abstract

In this article, a novel and non-toxic Schiff base containing multi-heteroatom coded with the name 5-DAT (5-(4-(diethylamino)benzylidene)amino)-1,3,4-thiadiazole-2-thiol is designed as the corrosion inhibitor for mild steel (MS) in 1.0 M HCl. The structure of Schiff base is illuminated by NMR, FT-IR, UV spectrophotometers and theoretical (Gaussian and Monte Carlo) calculations. Electrochemical techniques were utilized to determine the inhibition efficiency of synthesized Schiff base on mild steel corrosion. The surface of the MS was characterized by scanning electron microscopy. The inhibition talent of the 5-DAT was described by electrochemical impedance spectroscopy, lineer polarization resistance, and potentiodynamic polarization techniques. 5-DAT synthesized in this study showed high A c c e p t e d M a n u s c r i p t 2 efficiency with 98.9% inhibition efficiency since it contains high electron density heteroatoms such as nitrogen, sulfur and many multiple bonds, which are considered as more adsorption centers compared to the previous ones. While 5-DAT shows efficiency at 298K, according to EIS and LPR results, respectively, 98.41, 98.12; It was observed that the efficiency was not lost much with 93.87, 92.86 efficiencies at 328 K. The presence of a 5-DAT film, which is homogeneously dispersed on the surface, protects the metal surface against corrosion.

Synthesis and Corrosion Inhibition Performance of Mannich Bases on Mild Steel in Lactic Acid Media

“…From constant K ads , the adsorption free energy ΔG ads can be determined as follows 45 = G RT K ln(55. 5 ) ads ads (17) where R is the universal gas constant, T is the thermodynamic temperature, and 55.5 is the molar concentration of water. 45 The calculated ΔG ads values of DTZA and DPZA in a 363 K environment are −34.62 and −28.90 kJ•mol −1 , respectively.…”

“…There has been a vast amount of research literature on corrosion inhibitors for mild steel in strong acid media . Organic molecules with structural moieties, such as imidazoles, tetrazoles, triazoles, pyridines, quinolones, Shiff bases, Mannich bases, and quaternary ammonium salts have been investigated to serve industrial demands. Among them, Mannich bases prepared from acetophenone, formaldehyde, and organic amine represent a very important type of corrosion inhibitors used in highly concentrated acid media and at high temperatures. , Unfortunately, conventional commercial inhibitors that work well in the hydrochloric acid system are unsatisfactory when used in lactic acid.…”

Effect of molecular weight on inhibition performance of modified polyethyleneimine as polymer corrosion inhibitor for carbon steel in neutral medium

“…[11][12][13] Conventional corrosion inhibitors applied in neutral medium are inorganic salts such as nitrite, zine salts, and phosphate, and a small amount of organic substance, and with the enhancement of people's awareness of environmental protection, the usage of these substances is increasingly restricted by environmental development. [14][15][16][17][18][19][20][21][22] Therefore, effective and eco-friendly inhibitors in neutral medium need to be developed urgently.…”

Corrosion inhibition properties of schiff base derivative against mild steel in HCl environment complemented with DFT investigations

“…There is much research on mild steel anticorrosion compounds in corrosive environments 13 , such as organic compounds with structural moieties including tetrazoles, imidazoles, triazoles, quinolones, pyridines, Schiff bases, quaternary ammonium salts, and Mannich bases [23][24][25][26][27][28][29][30] . A particularly significant class of corrosion inhibitors utilized in the highly concentrated acidic environment is Schiff bases made from thiadiazoles and aldehydes 31,32 .…”