Electrochemical impedance spectroscopy of pure copper exposed in bentonite under oxic conditions

2011 ◽  
Vol 56 (23) ◽  
pp. 7862-7870 ◽  
Author(s):  
Bo Rosborg ◽  
Tadeja Kosec ◽  
Andrej Kranjc ◽  
Jinshan Pan ◽  
Andraz Legat
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Pure Copper

scholarly journals Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marziya Rizvi ◽  
Husnu Gerengi ◽  
Savas Kaya ◽  
Ilyas Uygur ◽  
Mesut Yıldız ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Sodium Nitrite ◽  
Electrochemical Impedance ◽  
Pure Copper ◽  
Cooling Water ◽  
Copper Surface ◽  
Corrosion Mechanism ◽  
Maximum Inhibition ◽  
Surface Morphologies

AbstractThe corrosion inhibition behavior of sodium nitrite (NaNO2) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO2 interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated that the surface homogeneity increased on adding sodium nitrite. Sodium nitrite’s adsorption on copper surface followed the modified form of Langmuir, Freundlich and Frumkin isotherms. Physiosorption mode was involved in the corrosion protection. Electrochemical results revealed an corrosion resistance of copper increases on increasing the inhibitor concentration. The DEIS results indicated that copper corrosion mechanism could be hindered by 50% even after interval of 24 h by optimum concentration of sodium nitrite. The maximum inhibition was achieved with 2000 ppm of NaNO2. With this concentration, inhibition efficiency of up to 61.8% was achievable.

scholarly journals An Investigation on Dislocation Density in Cold-Rolled Copper Using Electrochemical Impedance Spectroscopy

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Elyas Rafiee ◽  
Mansour Farzam ◽  
Mohammad Ali Golozar ◽  
Ali Ashrafi
Keyword(s):  
Charge Transfer ◽  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Dislocation Density ◽  
Electrochemical Impedance ◽  
Pure Copper ◽  
Annealed Sample ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Cold Rolled

Variation of electrochemical impedance with dislocation density was investigated using electrochemical impedance spectroscopy (EIS). For this purpose, EIS measurements were carried out on 10, 20, 30, 40, and 50% cold-rolled commercially pure copper in 0.1 M NaCl (pH = 2) solution. Nyquist plots illustrated that the electrochemical reactions are controlled by both charge transfer and diffusion process. Increasing dislocation density, the magnitude of electrochemical impedance of samples was decreased. Decreasing magnitude of impedance at intermediate frequencies indicated increasing double-layer capacitance. Charge transfer resistance decreased from value 329.6 Ωcm2 for annealed sample to 186.3 Ωcm2 for sample with maximum dislocation density (1.72×1015 m−2). Phase angles were lower for samples that contained more dislocation density, indicating more tendencies to loss of electrons and releasing atoms into electrolyte.

Sign in / Sign up

Export Citation Format

Share Document