Corrosion Protection of Rotating Copper Rod in a Solution of NaCl and Na2S by Using 4-Amino-4H-1,2,4-Triazole as Corrosion Inhibitor

This work investigates the possibility of improving the corrosion resistance of rotating copper parts in a solution of NaCl and Na2S by using one of triazole derivatives namely 4-Amino-4H-1,2,4-triazole (AHT) as corrosion inhibitor. The potentiodynamic technique was used for investigation of the effect of different variables on the corrosion of rotating copper such as rotational speed, initial S-2 concentration, rotating copper diameter, solution temperature and initial AHT inhibitor concentration. The results showed that AHT inhibitor can improve the corrosion resistance of rotating copper parts by a factor ranging from 1.30 to 1.66 depending on AHT inhibitor concentration and rotational speed. The results show that the activation energy for corrosion of copper in 3.5% sodium chloride solution and 10ppm S-2 without the inhibitor ranges from 0.7 to 1.07kCal/gmol while it ranges from 1.879 to 3.366kCal/gmol in the presence of 10ppm of AHT corrosion inhibitor depending on the rotational speed which indicate that the process is mainly diffusion controlled.