Electrochemical and thermodynamic properties of 1-phenyl-3-(phenylamino)propan-1-one with Na ₂ WO ₄ on N80 steel

Abstract

The corrosion inhibition effect and adsorption behaviour of 1-phenyl-3-(phenylamino)propan-1-one (PPAPO) on N80 steel in hydrochloric acid solution have been investigated by Fourier transform infrared (FTIR), electrochemical method and scanning electron microscopy. The corrosion inhibition mechanism of PPAPO mixed with Na 2 WO 4 was interpreted from the thermodynamic point of view. The results indicated that PPAPO mixed with Na 2 WO 4 acted as a mixed-type inhibitor. The inhibition film formed on N80 steel surface can increase the charge transfer resistance and prevent the occurrence of corrosion reaction, thereby reducing the corrosion rate of metal surface. The inhibition efficiency was up to 96.65%; the inhibitor PPAPO with Na 2 WO 4 showed good synergistic effect on N80 corrosion behaviour in HCl solution. The adsorption behaviour of inhibitors on N80 steel surface was in accordance with the Langmuir adsorption model and mainly belonged to chemisorption. The adsorption process of PPAPO on N80 surface was spontaneous and irreversible endothermic reaction.

Experimental study and mathematical modelling of the corrosi-on inhibition of mild steel with an organic compound in 1 M HCl

“…The negative value of ∆H°ads indicates that adsorption process is exothermic [3,7,23]. An exothermic adsorption process signifies chemical, physical or a mixture of both [24][25][26][27], whereas the endothermic process is attributed to chemisorption [28,29]. Results obtained from thermodynamic calculations for adsorption are in good agreement with the values of inhibition efficiency obtained from the weight loss.…”

Performance of a Composite Inhibitor on Mild Steel in NaCl Solution: Imidazoline, Sodium Molybdate, and Sodium Dodecylbenzenesulfonate

“…Various corrosion inhibitors have been developed to reduce the corrosion rate of mild steel [4,5] and thereby extend the life of the equipment [6,7] in response to this problem. However, there are serious health and environmental hazards associated with conventional high-performance corrosion inhibitors that contain metal salts like tungstates and chromates along with a variety of chemical compounds [8,9]. This contradicts the increasing demand for eco-friendly production.…”