New 8-Hydroxyquinoline-Bearing Quinoxaline Derivatives as Effective Corrosion Inhibitors for Mild Steel in HCl: Electrochemical and Computational Investigations

Coatings

卷:10

Sheerin Masroor¹  IsmatH. Ali²  Hassane Lgaz³  Youngjae Cho⁴  Maryam Chafiq⁵  Rachid Salghi⁵  Abdelkarim Chaouiki⁵  Brahim Lakhrissi⁶  Mohamed Rbaa⁶ 

[1] Department of Chemistry, Anugrah Narayan College, Patliputra University, Patna 800013, India;

[2] Department of Chemistry, College of Science, King Khalid University, P. O. Box 9004, Abha 61413, Saudi Arabia;

[3] Department of Crop Science, College of Sanghur Life Science, Konkuk University, Seoul 05029, Korea;

[4] Department of Food Science and Technology, Pusan National University, 1268-50 Samrangjin-ro, Samrangjin-eup, Miryang 50463, Korea;

[5] Laboratory of Applied Chemistry and Environment, ENSA, University Ibn Zohr, PO Box 1136, Agadir 80000, Morocco;

[6] Laboratory of Organic Chemistry, Catalysis and Environment, Faculty of Sciences, Ibn Tofail University, P.O. Box 133, Kenitra 14000, Morocco;

关键词: corrosion inhibition;    mild steel;    quinoxaline;    SEM;    quantum chemical calculation;    MD simulations;   

DOI  :  10.3390/coatings10090811

来源: DOAJ

【 摘 要 】

There has been substantial research undertaken on the role of green synthesized corrosion inhibitors as a substantial approach to inhibit the corrosion of metals and their alloys in acidic environments. Herein, electrochemical studies, surface characterization, and theoretical modeling were adopted to investigate the corrosion inhibition proprieties of novel synthesized quinoxaline derivatives bearing 8-Hydroxyquinoline, namely 1-((8-hydroxyquinolin-5-yl) methyl)-3,6-dimethylquinoxalin-2(1H)-one (Q1) and 1-((8-hydroxyquinolin-5-yl)methyl) quinoxalin-2(1H)-one (Q2) on mild steel corrosion in 1 mol/L HCl solution. The principal finding of this research was that both inhibitors acted as good corrosion inhibitors with Q1 having the highest performance (96% at 5 × 10⁻³ mol/L). Electrochemical results obtained via potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques demonstrated that quinoxaline compounds belonged to mixed-type inhibitors; their presence significantly increased the polarization resistance, preventing simultaneously anodic and cathodic reactions. Further, experimental results provided preliminary insights about the interactions mode between studied molecules and the mild steel surface, which followed the Langmuir adsorption model, and physical and chemical interactions assisted their inhibition mechanism. Besides, SEM analyses confirmed the existence of protective film on the metal surface after the addition of 5 × 10⁻³ mol/L of quinoxalines. In addition, the temperature and immersion time effects on inhibition performances of quinoxalines were investigated to evaluate their performances in different operating conditions. Besides, Density Functional Theory (DFT) and molecular dynamics (MD) simulations were carried out to explore the most reactive sites of quinoxaline inhibitors and their interaction mechanism. Theoretical results revealed that the inhibitor molecule with additional electron-donating functional group strongly interacted with the steel surface.

【 授权许可】

Unknown