Experimental and surface morphological studies of corrosion inhibition on carbon steel in HCl solution using some new hydrazide derivatives

Abstract

The inhibitory effect of three newly synthesized hydrazide derivatives on carbon steel corrosion in hydrochloric acid showed better inhibition efficiency (97.5%) and their inhibition mechanism is presented.

Efficient corrosion inhibition by sugarcane purple rind extract for carbon steel in HCl solution: mechanism analyses by experimental and in silico insights

“…The slope of log f vs. log | Z| approached −1 with an increase in the concentration of SPRE concentration, suggesting the favorable capacitive characteristic at the steel/electrolyte interface. 38 …”

Corrosion inhibition and thermodynamic studies on carbon steel in well water by ethanolic extract of Alpinia officinarum leaves (Lesser galangal)-Zn2+

“…The positive values of E a reveal that a highly adsorption on the CS surface (54) . The values of ∆H indicate that adsorption of AO extract is endothermically on the CS surface (31,53,(55)(56)(57) .…”

“…Thermodynamic parameters are computed to detemine the type of adsorption on the surface of CS. Adsorption of ethanolic extract of AO leaves has a spontaneous process (40) onto CS surface with physisorption (57) , as evidenced by the free energy of adsorption (∆G ads ) and heat of adsorption (q ads ) negative values (27,53) . ∆G ads have negative values of less than -20KJmol -1 , implying that the nature of adsorption is physisorption (30,53,(56)(57)(58)(59) for the investigative inhibitor system.…”

“…Adsorption of ethanolic extract of AO leaves has a spontaneous process (40) onto CS surface with physisorption (57) , as evidenced by the free energy of adsorption (∆G ads ) and heat of adsorption (q ads ) negative values (27,53) . ∆G ads have negative values of less than -20KJmol -1 , implying that the nature of adsorption is physisorption (30,53,(56)(57)(58)(59) for the investigative inhibitor system. When compared to the other three temperatures, ∆G ads has the highest negative value of -18.4KJmol -1 at 303K and the lowest negative value of -16.4KJmol -1 at 333K.…”

“…When compared to the other three temperatures, ∆G ads has the highest negative value of -18.4KJmol -1 at 303K and the lowest negative value of -16.4KJmol -1 at 333K. The negative values of entropy of adsorption (∆S ads ) show that an ethanolic extract of AO leaves form a protective layer on the CS surface (53,54,(56)(57)(58)60) . Result of thermodynamic parameters are given in Table 7 .…”