Inhibition of Copper Corrosion by Ethanolamine in ۱۰۰ ppm NaCl

We study copper corrosion inhibition by ethanolamine (ETA)with (۰, ۰.۲ ,۰.۳,۰.۴,۰.۵) vol.% concentrations in ۱۰۰ ppm NaCl solution. This work is carried out by potentiodynamic measurements and Electrochemical Impedance Spectroscopy (EIS). The substrates' surface morphologies are examined by Scanning Electron Microscopy (SEM). ETAis characterized by NMR spectra of ETA۱H and ۱۳C and Fourier Transform InfraRed Spectroscopy (FT-IR).Quantum chemical calculation (DFT) is conducted to correlate the adsorption mechanism with  ETAmolecule structure. The results show thatETA acts as a mixed inhibitor; so at ۰.۴ vol. %, the current density ( i ) and the polarization resistance (Rp) are respectively ۰.۸µA/cm۲ and ۲۸.۶۲ Ω.cm۲ with  ۹۹.۷۸%  corresponding  efficiency . ETA adsorption obeys to Langmuir isotherm and takes place on the copper surface through chemical and physical mixed-type adsorption.

کلیدواژه ها:

Copper Corrosion ، Corrosion inhibitor ، ETA ، EIS ، Polarization