The corrosion inhibition effect and adsorption behavior of 1-phenyl-3-(phenylamino)propan-1-one(PPAPO) on N80 steel in hydrochloric solution have been investigated by Fourier transform infrared (FTIR), electrochemical method and scanning electron microscopy (SEM). The corrosion inhibition mechanism of PPAPO with Na₂WO₄ was interpreted from the point of view of the thermodynamic. The results indicated that PPAPO 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 99.65%; and the inhibitor PPAPO with Na₂WO₄ showed good synergistic effect on N80 corrosion behavior in HCl solution. The adsorption behavior 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.

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