Influence of blackberry leaf extract on the copper corrosion behaviour in 0.5 M NaCl

The research presented in this paper is focused on blackberry leaf extract (BLE) as a environmentally friendly corrosion inhibitor for copper in 0.5 M NaCl. The caffeic acid, quercetin-3-O-glucoside and kaempferol-3-Oglucoside were identified in BLE by using high-performance liquid chromatography (HPLC-DAD). The BLE functional groups were identified (ATR-FTIR). The electrochemical methods (potentiodynamic polarization, electrochemical frequency modulation and electrochemical impedance spectroscopy) show that BLE acts as a mixed type of inhibitor (max. IE is 97.19 %). The corrosion process is controlled by diffusion (BLE lower than 15 g/L) and charge transfer (15 g/L BLE).

Automated summary

This research focuses on blackberry leaf extract (BLE) as an environmentally friendly corrosion inhibitor for copper in 0.5 M NaCl. High-performance liquid chromatography (HPLC-DAD) was used to identify caffeic acid, quercetin-3-O-glucoside, and kaempferol-3-Oglucoside in BLE. The functional groups of BLE were identified using attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). Electrochemical methods, including potentiodynamic polarization, electrochemical frequency modulation, and electrochemical impedance spectroscopy, show that BLE acts as a mixed type inhibitor with a maximum inhibition efficiency (IE) of 97.19%. The corrosion process is controlled by diffusion when BLE concentration is lower than 15 g/L, and by charge transfer at 15 g/L BLE.