Influence of 5-Chlorobenzotriazole on Inhibition of Copper Corrosion in Acid Rain Solution

Abstract

This paper aims to examine the efficiency of 5-chlorobenzotriazole (5Cl-BTA) as a copper corrosion inhibitor in acidic rain solutions with a pH value of 2.42 by the electrochemical polarization method. 5-Chlorobenzotriazole acts similar to a mixed type inhibitor, according to the potentiodynamic polarization measurements. Results obtained in this research suggest that 5Cl-BTA is a good inhibitor; it decreases anodic and cathodic reaction rates, and the highest inhibition efficiency was 91.2%. The inhibitory effect of 5-chlorobenzotriazole is explained by the formation of the layer on the copper surface. Stability of the protective layer increased with inhibitor concentration. Scanning electron microscopy and energy-dispersive analysis of X-rays analysis confirmed that on the electrode surface, a protective layer was formed. Adsorption of 5Cl-BTA obeys the Langmuir adsorption isotherm. 5Cl-BTA showed good inhibitory characteristics even when the Cl– ions were present in examined solutions.

DFT, Monte Carlo and molecular dynamics simulations for the prediction of corrosion inhibition efficiency of novel pyrazolylnucleosides on Cu(111) surface in acidic media

“…These results have shed light on sites through which the inhibitors could interact with the studied surface 53,54 . Donor sites, as we reported previously, are the suitable sites for molecules preferentially bonded with positively polarized anodic reaction sites as with copper surface Cu(111) in acid media [55][56][57] , thereby reducing the migration of corrosive species onto the copper surface, which reflects a decreased rate of anodic copper dissolution reaction 58 . LUMO distribution depicts acceptor parts of the molecules 59 ; this could explain the possibility of an interaction (adsorption) of the inhibitor molecules through its acceptor atoms on the metallic surface, often having a positive charge as mentioned previously [55][56][57] .…”

Synthesis, Experimental and DFT Studies of Some Benzotriazole Derivatives as Brass C68700 Corrosion Inhibitors in NaCl 3 %

“…inhibition efficiencies increases suggesting that these molecules are effective corrosion inhibitors. This can be explained by the formation of a protective layer on the brass surface [15,19,22,23–24] . Moreover, the BTA derivatives addition, changes the anodic (βa) and cathodic Tafel (βc) slopes conducting in a change in brass dissolution and hydrogen evolution mechanisms which can be explained firstly by the adsorption of BTA molecules.…”

“…This can be explained by the formation of a protective layer on the brass surface. [15,19,22,[23][24] Moreover, the BTA derivatives addition, changes the anodic (βa) and cathodic Tafel (βc) slopes conducting in a change in brass dissolution and hydrogen evolution mechanisms which can be explained firstly by the adsorption of BTA molecules. E corr slightly shifted and all the displacements are lower than 85 mV, indicating that BTA compounds act as mixed inhibitors.…”

“…[18] 1,2,3-triazole (BTA) compounds has been reported as a well-known effective corrosion inhibitors of copper in many environments. [19] With the improvement of hardware and software, Recently, quantum chemical methods like functional density theory (DFT) has been used as fast and powerful tool to predict and understand corrosion inhibition performances of inhibitors. [20] Although there is an extensive literature on the corrosion properties of benzotriazole on steel and copper, [21][22] there are very few reports devoted to the various functional groups in BTA derivatives on the corrosion of brass.…”

“…1,2,3‐triazole (BTA) compounds has been reported as a well‐known effective corrosion inhibitors of copper in many environments [19] …”