Abstract
AbstractThe inhibition of the corrosion of mild steel in 0.1 M H2SO4 by 3-nitrobenzoic acid was studied using weight loss, electrochemical impedance spectroscopy (EIS), linear polarization resistant, potentiodynamic polarization, scanning electron microscopy, Fourier transformed infra-red spectroscopy and quantum chemical techniques. The results obtained indicated that 3-nitrobenzoic acid inhibited the corrosion of mild steel in solution of H2SO4. Maximum inhibition efficiency obtained from weight loss, potentiodynamic, linear polarization and EIS methods were 87.15, 90.51, 95.42 and 99.40% at inhibitor’s concentration of 0.01 M respectfully. The activation energies (which ranged from 26.02 to 59.02 J/mol) supported the mechanism of charge transfer from charged inhibitor to charged metal surface, which favours the mechanism of physical adsorption. The adsorption of the inhibitor was found to be exothermic and spontaneous. Although the adsorption characteristics of the inhibitor fitted the Langmuir adsorpt...
Highlights
Metals are valuable components of almost all industrial installations and the cost of their installation is very expensive, indicating that they should have considerably long life span
The plots revealed that weight loss of mild steel in solutions of H2SO4 increases with increase in the period of contact and with increasing temperature
These observations suggest that the rate of corrosion of mild steel in solutions of H2SO4 increases with increase in the period of contact and with increase in temperature
Summary
Metals are valuable components of almost all industrial installations and the cost of their installation is very expensive, indicating that they should have considerably long life span. Their life span is often shortened by corrosion. Some of the options that are available for preventing metals against corrosion are painting, anodic/cathodic protection, electroplating and the use of corrosion inhibitors (Shukla & Ebenso, 2011). The use of corrosion inhibitors is widely acceptable as one of the most efficient method of corrosion protection. Trend in the choice of corrosion inhibitors, in recent times, has been directed towards the use of inhibitors that are less toxic, less expensive, biodegradable and environmental friendly (Kamal & Sethuraman, 2012; Umoren, Ogbobe, Okafor, & Ebenso, 2007; Yaro, Khadom, & Wael, 2014)
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