Abstract
Acetophenone derivatives are eco-friendly corrosion inhibitors to prevent corrosion of mild steel (MS) in acidic medium. In this work, the inhibition effect of 3-nitroacetophenone (3-NA) on the corrosion of MS in acidic medium (1 N HCl) was investigated using weight loss measurements, electrochemical measurements, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and quantum chemistry analysis. The studies were performed using different concentrations of inhibitors and at different temperatures. The results indicated that the inhibition efficiency of 3-NA increases with an increase in inhibitor concentration and reaches to a maximum of 64% at inhibitor concentration of 250 ppm at 30°C. The potentiodynamic polarization measurement indicated that 3-NA acts as mixed category of interdict. The adsorption of 3-NA on MS surface followed the Langmuir adsorption isotherm. The mode of adsorption of 3-NA on MS surface was further studied by quantum chemical calculations based on density functional theory (DFT). The results plainly revealed that 3-NA performs fairly as corrosion interdict for MS in acidic medium.
Highlights
Mild steel (MS) is widely used in infrastructural construction and has gained popularity due to its mechanical properties, malleability, toughness, availability, and low cost
The abraded MS specimens were immersed in the solution (1 N HCl with various concentrations of the inhibitor) for 1 hour, and corrosion rate (CR) and inhibition efficiency (IE) were calculated and the results are shown in Figure 1 and Table 1
It is evident that the corrosion rate decreases with an increase in the concentration of the 3-NA and the inhibition efficiency increases with an increase in the concentration of the inhibitors which indicated that there is a substantial surface coverage by the interdict and strong bonding to surface of the mild steel
Summary
Mild steel (MS) is widely used in infrastructural construction and has gained popularity due to its mechanical properties, malleability, toughness, availability, and low cost It is substantially applied in different industries for different purposes which comprise production of pipelines, metal tanks, gas cylinders, and heat exchangers. Inhibitors are chemical substances that can successfully impede the metal corrosion in a corrosive environment, and several organic and inorganic compounds with electron-donating substituents are used as an effective corrosion inhibitor in various industries [1]. Successful class of compounds for bioreduction using CRED enzymes [3] Acetophenones and their derivatives are known to act as corrosion inhibitors in aggressive media [4,5,6,7]. Surface morphologies and elemental composition of MS were investigated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), respectively
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