Abstract
This research demonstrates the effect of some amide compounds (1 and 2) as corrosion inhibitors on C-steel in 1.0 M of hydrochloric solutions utilizing mass reduction studies, electrochemical [potentiodynamic (PP), AC impedance measurements (EIS), electrochemical frequency modulation] techniques, and surface checks were used to illustrate the importance of amide compounds to the corrosion protection process of C-steel. The tests displayed that the inhibition efficiency (IE%) augmented with increase in amide dose but reduced with growth of temperature. The highest inhibition efficiency is 99% for compound (1) and 98.8% for compound (2) at maximum dose tested (50 µM) by polarization method. PP data show that these compounds affect both cathodic and anodic processes (i.e. mixed type) and were adsorption on the carbon steel obeying Langmuir adsorption isotherm. The EIS results indicate that the changes in impedance parameters are related to the adsorption of amides on the alloy surface. Scanning of electron microscopy, energy transmitted X-ray—Atomic force microscopy studied the morphology of inhibited C-steel.Graphic abstract
Highlights
Due to their environmental threat, the utilized of toxic materials as inhibitors has been restricted, so there is good interest in changing harmful inhibitors with impact nonhazardous substitutes [1,2,3,4,5,6,7,8,9]
“The analysis of the results was obtained in Table 5, it implies surface reaction dominates the overall activity, since the corrosion process ( E*a) is over (20 kJ mol-1) and increase in the activation energy by increasing the dose of amide compounds
This increase is due to the adsorption nature of amide compounds on the C-steel and corresponds to the physical adsorption of the amide compound drugs [41]
Summary
Due to their environmental threat, the utilized of toxic materials as inhibitors has been restricted, so there is good interest in changing harmful inhibitors with impact nonhazardous substitutes [1,2,3,4,5,6,7,8,9]. Adsorption will be based on the theoretical contact of the inhibitor’s π-orbitals with the surface atoms orbitals. This interaction causes greater adsorption on the C-steel surface, resulting in film-protective corrosion [16]. Have considerable similarity with the substructures of many of the commonly used drugs. This feature has prompted scientists across the globe to investigate the applicability of drugs as corrosion inhibitors. Bearing non-toxic characteristics and negligible negative environmental impact, drugs (chemical medicines) have emerged as suitable candidates to replace the conventionally used toxic corrosion inhibitors [21] (Table 1)
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