Ivana Martinović, G. Zlatić, Z. Pilić, M. Šušak, F. Falak
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引用次数: 0
摘要
采用扫描速率为100 mV s−1,在0 V ~ 800 mV电位范围内记录的循环伏安图测定了黑参提取物中抗氧化剂含量(抗氧化能力)。提取物的抗氧化能力为4.06 mg GAE g−1 fw(每克鲜重提取物的没食子酸当量mg)。采用动电位极化法和电化学阻抗谱法研究了黑参提取物在3% NaCl溶液中对铝、铜和青铜的缓蚀效果。极化数据表明,萃取物为混合型缓蚀剂,其缓蚀过程为萃取物分子在金属表面的自然物理吸附(Δ G≈-16 kJ mol -1),遵循Freundlich等温线。阻抗谱研究表明,提取物浓度的增加降低了双层电容,增加了电荷转移电阻。当萃取物浓度为1.0 g L -1时,Cu: ~ 57%, CuSn14: ~ 74%, Al: ~ 58%,抑制率最高。
Antioxidant Capacity and Corrosion Inhibition Efficiency of Sambucus nigra L. Extract
The cyclic voltammogram recorded in the potential range between 0 V and 800 mV with scan rate of 100 mV s −1 was used to determine the measure of antioxidants content (antioxidant capacity) present in Sambucus nigra L. extract. The antioxidant capacity of the extract was 4.06 mg GAE g −1 fw (mg of gallic acid equivalents per gram of fresh weight of the extract). The corrosion inhibition efficiency of Sambucus nigra L. extract on aluminium, copper, and bronze in 3 % NaCl solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. Polarization data showed that extract acted as a mixed-type inhibitor, that the corrosion inhibition process was spontaneous physical adsorption (Δ G ≈ –16 kJ mol –1 ) of the extract molecules on metals surfaces and followed Freundlich isotherm. Impedance spectroscopy studies revealed that increasing the concentration of extract reduced the double-layer capacitance and increased the charge transfer resistance. The highest inhibition efficiencies (Cu: ~ 57 %, CuSn14: ~74 % and Al: ~58 %) were achieved for an extract concentration of 1.0 g L –1 .
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