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Abstract
The 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.
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1 Duzce University, Corrosion Research Laboratory, Department of Mechanical Engineering, Faculty of Engineering, Duzce, Turkey (GRID:grid.412121.5) (ISNI:0000 0001 1710 3792)
2 Sivas Cumhuriyet University, Department of Pharmacy, Health Services Vocational School, Sivas, Turkey (GRID:grid.411689.3) (ISNI:0000 0001 2259 4311)
3 Duzce University, Department of Electricity and Energy, Duzce Vocational High School, Duzce, Turkey (GRID:grid.412121.5) (ISNI:0000 0001 1710 3792)
4 Gdansk University of Technology, Corrosion and Materials Engineering, Department of Electrochemistry, Faculty of Chemistry, Gdańsk, Poland (GRID:grid.6868.0) (ISNI:0000 0001 2187 838X)
5 Ibn Zohr University, Applied Chemistry-Physics Team, Materials and Environment Laboratory, Faculty of Sciences, Agadir, Morocco (GRID:grid.417651.0) (ISNI:0000 0001 2156 6183)