Adsorption and corrosion inhibition properties of pyridine‐2‐aldehyde‐2‐quinolylhydrazone for Q235 steel in acid medium: Electrochemical, thermodynamic, and surface studies. Issue 11 (18th July 2018)

• Record Type: Journal Article
• Authors: Zhang, Weiwei; Li, Hui‐Jing; Wang, Yiwei; Liu, Ying; Wu, Yan‐Chao
• Is Part Of: Materials and corrosion. Volume 69:Issue 11(2018)
• Page Start: 1638
• Page End: 1648
• Publication Date: 2018-07-18
• Subjects: corrosion inhibition -- polarization curves -- Q235 steel -- SECM -- SEM; Materials -- Periodicals; Metals -- Periodicals; Corrosion and anti-corrosives -- Periodicals; 620.1122305
• DOI: 10.1002/maco.201810252
• Languages: English
• ISSNs: 0947-5117

Abstract

Abstract : A new organic compound pyridine‐2‐aldehyde‐2‐quinolylhydrazone (PAQ) was synthesized and its structure was characterized by 1 H NMR and FTIR spectroscopy. The inhibition effect of PAQ on the Q235 steel corrosion was investigated with potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM)/energy dispersive X‐ray spectroscopy (EDX), and scanning electrochemical microscope (SECM). The inhibition mechanism was further studied in view of the effect of inhibitor concentration and temperature on the corrosion of steel. Polarization studies showed that the PAQ acted as a mixed‐type inhibitor. The adsorption of PAQ inhibitor on Q235 steel surface follows Langmuir adsorption isotherm and contains both physical and chemical type adsorptive. The formation and characteristic of protective layer on the steel surface were verified by surface analysis techniques (SEM, EDX, SECM). Abstract : Pyridine‐2‐aldehyde‐2‐quinolylhydrazone (PAQ) was found to be a water‐soluble, high‐temperature resistance, and highly efficient corrosion inhibitor for Q235 steel in 1 M HCl solution, which was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy, SEM/EDX, and SECM.