樟树叶提取液在硫酸介质中对碳钢的缓蚀作用

Inhibition of Extractives from Cinnamomum Camphor Leaves on Carbon Steel in H_2SO_4 Solution

应用动电位极化法和电化学阻抗(EIS)研究了樟树叶提取液(CCLE)在硫酸介质中对碳钢的缓蚀性能和缓蚀机理.结果表明,采用酸浸泡法从樟树叶中提取的缓蚀剂,对碳钢在10%H_2SO_4溶液中具有良好的缓蚀作用,随着提取液浓度的增加,缓蚀效率增大;随着实验温度升高,缓蚀效率减小.樟树叶提取液为混合抑制型缓蚀剂,提取液中的有效缓蚀成分在碳钢表面的吸附满足Langmuir等温吸附方程;樟树叶提取液的加入使碳钢在硫酸中反应的表观活化能增加,起到缓蚀作用.

The corrosion inhibition effect of the Cinnamomum camphor leaves extractive for carbon steel in 10% H2SO4 solution was investigated by using potentiodynamic polarization and electrochemical impedance spectroscopy. The results showed that the Cinnamomum camphor leaves extractive had good corrosion inhibition effect for carbon steel in 10% H2SO4 solution. The inhibition efficiency increased with increasing concentration of Cinnamomum camphor leaves extractive, and decreased with increasing temperature. The Cinnamomum camphor leaves extractive was a mixed-type inhibitor, and the adsorption of the effective corrosion inhibition component of Cinnamomum camphor leaves extractive on the carbon steel surface conformed with Langmuir adsorption isotherm equation. The addition of Cinnamomum camphor leaves extractive in sulfuric acid solution enhanced the apparent activation energy of the reaction on carbon steel, which made the corrosion inhibition effective.