tailieunhanh - Corrosion inhibition capacity of two heterocyclic oximes on copper in nitric acid: electrochemical, quantum chemical and surface morphological investigations

Two heterocyclic oximes (E)-N-hydroxy-1-(pyridin-2-yl)methanimine (Hp2ylm) and (E)-N-hydroxy-1-(pyridin-3-yl)methanimine (Hp3ylm) were synthesized from pyridine-2-carbaldehyde and pyridine-3-carbaldehyde, respectively. | Corrosion inhibition capacity of two heterocyclic oximes on copper in nitric acid electrochemical quantum chemical and surface morphological investigations Current Chemistry Letters 8 2019 1 12 Contents lists available at GrowingScience Current Chemistry Letters homepage Corrosion inhibition capacity of two heterocyclic oximes on copper in nitric acid electrochemical quantum chemical and surface morphological investigations C. Sini Varghesea K. Joby Thomasa Vinod P. Raphaelb and K. S. Shajub a Research Division Department of Chemistry St. Thomas College Autonomous Thrissur Kerala 680001 India b Department of Chemistry Government Engineering College Thrissur Kerala 680009 India CHRONICLE ABSTRACT Article history Two heterocyclic oximes E -N-hydroxy-1- pyridin-2-yl methanimine Hp2ylm and E -N- Received September 9 2018 hydroxy-1- pyridin-3-yl methanimine Hp3ylm were synthesized from pyridine-2- Received in revised form carbaldehyde and pyridine-3-carbaldehyde respectively. These oximes were characterized by November 9 2018 various spectroscopic tools like UV IR MASS and NMR. The inhibition capacity of these Accepted December 14 2018 oximes against copper corrosion in M HNO3 was determined by polarization and Available online impedance spectroscopic studies EIS . At all concentrations Hp3ylm exhibited higher December 14 2018 inhibition efficiency than Hp2ylm. Attempt was made to illustrate the mechanism of corrosion Keywords inhibition by these oximes with the help of adsorption isotherm scanning electron microscopic Corrosion SEM and quantum chemical studies. Inhibitor Polarization Impedance Adsorption 2019 by the authors licensee Growing Science Canada. 1. Introduction Copper is a noble and widely using engineering metal in various fields like electrical electronics and automobile Due to the less corrosive behaviour only powerful oxidizing agents can or react with copper. For the fabrication of electronic components copper .