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 Na2WO4 was interpreted from the thermodynamic point of view. The results indicated that PPAPO mixed with Na2WO4 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 Na2WO4 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.
Highlights
The corrosion of carbon steel is a common phenomenon in the oil and gas fields, while it is easy to suffer from the erosion of high active particles in acid environment
(i) phenyl-3-( phenylamino)propan-1-one (PPAPO) as corrosion inhibitor for N80 steel in HCl solution suppressed the occurrence of anodic metal dissolution and cathodic reaction of hydrogen, thereby reducing the corrosion rate of metal surface
PPAPO is mixed with Na2WO4 to use for N80 steel corrosion in acid solution, which showed a good synergistic effect
Summary
The corrosion of carbon steel is a common phenomenon in the oil and gas fields, while it is easy to suffer from the erosion of high active particles in acid environment. Hydrochloric acid is often used in the solution of acid pickling, chemical cleaning and oil cleaning, removing impurities on the metal surface [1,2]. Chloride ion has the ability to pierce through the surface film due to its small radius and high activity, while the residual chlorine royalsocietypublishing.org/journal/rsos R. Ion is able to destroy the passive film formed on the surface of metal, developing a large amount of corrosion 2 pits and causing serious corrosion of equipment and piping components. Adding inhibitor into corrosion solution is one of the most practical methods to slow down the corrosion rate of metal in some anti-corrosion measures, which has the characteristics of simple process and strong adaptability [4,5]
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