New insights into copper corrosion in presence of benzotriazole and chloride ions

作者：Zhang, Y.; Chen, Y.^*

来源：Corrosion Engineering, Science and Technology, 2019, 54(1): 75-85.

DOI：10.1080/1478422X.2018.1537157

• Copper
• benzotriazole
• chloride ion
• electrochemical noise

The effect of Cl- concentration and temperature on the copper corrosion in NaCl solution in presence of 40 mg L-1 benzotriazole was investigated using cyclic voltammetry, electrochemical impedance spectroscopy, electrochemical noise (EN) and scanning electron microscopy (SEM). Results revealed that the charge transfer resistance decreased with increasing the Cl- concentration and temperature. The EN generated at low Cl- concentration and low temperature had small noise amplitude, while the EN showed large potential oscillation amplitude in the case of high Cl- concentration and high temperature. A parameter, named corrosion active energy C-AE, was proposed to further study the relationship between the EN feature and corrosion rate and corrosion severity (SEM). The variation trend of corrosion active energy C-AE with Cl- concentration and temperature was found to be opposite with energy gap E-g and charge transfer resistance. Thus, C-AE shows a promising potential to in situ evaluate the corrosion rate and corrosion severity.

• 出版日期2019-1-2
• 单位滨州学院