Azole compounds, copper corrosion

Inhibition of Copper Corrosion by Azole Compounds in Acidic Aqueous Solutions... 

Azole compounds, poly-N-vinylimidazole (PVI-1) and 2-undecylimidazole (UDI), are studied as alternative inhibitors to benzotriazole (BTA) for copper corrosion in aqueous systems using electrochemical techniques. It is shown that UDI, either as a cast film or dissolved in solution at concentrations as low as 7 X inhibits oxygen reduction on... 

Azole compounds such as benzotriazole, benzimidazole, indazole and imidazoles are efficient anti-corrosion agents for copper and copper-base alloys [1-10]. Many experimental techniques [11-15] have been used to study the corrosion inhibition mechanisms, however, the mechanisms are still not well understood. It is believed that the complex formation between copper and nitrogen atoms would inhibit oxygen adsorption on copper surface [16-20]. 

For copper corrosion in hot H2SO4, Ross and Berry found that benzotriazole (BTA) inhibits the rate of copper dissolution flow rate and aeration change the inhibitor concentration profile, and a film composed of the cuprous salt of BTA is formed. Other effective inhibitors for copper in H2SO4 include 2,4-dinitrophenyl-hydrazine, benzimidazole, indazole, and quinoline. Various azoles appear to be effective corrosion inhibitors for brass, as well as copper. Finally, Subra-manyan et al. studied the corrosion inhibition mechanisms of the alkaloids quinine (C21H22N2O2) and strychnine (C21H22N2O2). Both compounds inhibit the corrosion of copper, in 1% H2SO4 at 86°F (30°C), relatively well, and both chemisorb and... 

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