engleski

Effect of Flow on Corrosion Inhibition of Copper in Acid Media

The aim of this work is to study the influence of flow velocity and temperature on corrosion and protection of copper in hydrochloric acid. The efficiency of imidazole derivatives (4-methylimidazole and 1-phenyl-4-methylimidazole) as copper corrosion inhibitors in flow conditions has been investigated. Electrochemical measurements were performed in flow-through electrochemical cell at different flow rates (v1=0.005 ms-1, v2=0.009 ms-1, v3=0.014 ms-1) and temperatures (25„a C, 35„a C, 35„a C). Reynolds numbers calculated show that all experiments were performed under conditions of laminar flow (Re < 2320). Corrosion rate (corrosion current density) was determined by Tafel extrapolation methods and by polarization resistance measurements (Ą§linearĄ¨polarization). The results of the investigation have shown that the increase of flow velocity and temperature influence on growth of copper corrosion in uninhibited hydrochloric acid. The addition of imidazole derivatives decreases copper corrosion at all flow rates and temperatures. The influence of the flow rate on copper corrosion in inhibited solution of hydrochloric acid is small. The influence of the temperature is smaller in the solution of HCl with the addition of 1-phenyl-4-methylimidazole that has better protection degree of copper than 4-methylimidazole.

copper; hydrochloric acid; imidazoles; corrosion; inhibition; flow regime

nije evidentirano