Abstract

A New benzylidene derivative namely benzylidene-5-phenyl-1,3,4-thiadiazol-2-amine (BPTA), was successfully synthesized and characterized using Fourier Transform Infrared Spectroscopy, Nuclear Magnetic Resonance and elemental analysis (CHN) techniques. The inhibition efficiency of BPTA on mild steel corrosion in 1.0 N HCl was tested at various temperatures. The methodological work was achieved by gravimetric method complemented with morphological investigation. The concentrations of inhibitor were 0.1, 0.2, 0.3, 0.4 and 0.5 mM at the temperatures 303, 313, 323 and 333 K. The BPTA, molecules as become superior corrosion inhibitor with 92% inhibition efficiency of mild steel coupon in the acidic environment. The inhibition efficiency increased with increasing concentrations of BPTA and the excellent efficiency was performed with the 0.5 mM concentration and followed with 0.4 mM. In acidic environment, the 0.5 and 0.4 mM gave the optimum performance with weight loss technique and scanning electron microscopy analysis. On the other hand, the inhibition efficiency decreased with the increase of temperature. Results of BPTA indicated mixed type inhibitor and the adsorption on the mild steels surface obeys the Langmuir adsorption isotherm. It was found that the BPTA performance depend on the concentration and the solution temperature. Quantum chemical calculations have been done to correlate the electronic characteristics of BPTA with the corrosive inhibitive impact. Experimental and theoretical results are in good agreement.

Highlights

  • Acidic solutions have many applications in industries such as cleaning, pickling, descaling, and acidizing

  • Organic compounds proved their abilities for corrosion inhibition through adsorption on the metal surface, on the other hand inorganic inhibitors behavior as anodic inhibitor compounds and the iron atoms enclosed in the layer improve their corrosion impedance

  • The sequences for the reaction synthesis of BPTA starting from 2-amino-5-phenyl-1,3,4thiadiazol are outlined in Scheme 1

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Summary

Introduction

Acidic solutions have many applications in industries such as cleaning, pickling, descaling, and acidizing. The uses of HCl in industries was due to its performance action in cleaning in addition to low cost and comparting with other acids. The superior procedure technique to impedance the corrosion of the acidic environment is to use of organic inhibitors. The molecules of organic inhibitors were adsorbing on the surface of the mild steel and retard the active site through blocking the reactions occur on the surface of mild steel [1,2]. Organic compounds proved their abilities for corrosion inhibition through adsorption on the metal surface, on the other hand inorganic inhibitors behavior as anodic inhibitor compounds and the iron atoms enclosed in the layer improve their corrosion impedance. Density functional theory (DFT) were used to corroborate mythological findings

Experimental
Materials and Sample Preparation
Weight Loss Techniques
Density Functional Theory Calculation
Chemistry
Effects of Concentrations
Effect of Temperature
Adsorption Isotherms
Quantum Chemistry
Conclusions
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