香根草提取物对冷轧钢在盐酸溶液中的缓蚀作用  

Corrosion Inhibition of Vetiver Extract on Steel in Hydrochloric Acid Environment

作　　者：邓志华[1] 雷然 张智勇 杨维宇 李向红 DENG Zhihua;LEI Ran;ZHANG Zhiyong;YANGWeiyu;LI Xianghong(College of Ecology and Environment,Southwest Forestry University,Kunming 650224,China;College of Chemical Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]西南林业大学生态与环境学院,昆明650224 [2]西南林业大学化学工程学院,昆明650224

出　　处：《中国腐蚀与防护学报》2023年第1期173-178,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：2020年云南省大学生创新创业训练计划;西南林业大学教育科学研究项目(YB202023);云南省教育厅科学研究基金(2021J0163);云南省哲学社会科学基金(SH2021081);云南省哲学社会科学科普项目(2142008)。

摘　　要：采用回流提取法对香根草(Vetiveria zizanioides)提取得到香根草提取物(VZE),利用失重法和电化学法研究了VZE在1.0 mol/L HCl溶液中对碳钢的缓蚀作用。结果表明:温度为40℃,VZE浓度为0.20 g/L时,缓蚀效果最佳,缓蚀率可达91.9%。VZE在钢表面的吸附符合Langmuir吸附等温式,吸附类型为物理吸附和化学吸附相结合的混合吸附型。动电位极化曲线表明,VZE可同时抑制阴极和阳极反应,属于混合抑制型缓蚀剂。Nyquist图谱的容抗弧随VZE浓度的增大而明显增大,碳钢的电荷转移电阻增大,腐蚀反应速率降低,从而起到缓蚀作用。Vetiveria zizanioides was extracted by reflux extraction method to obtain vetiver extract(VZE).The corrosion inhibition of a cold rolled carbon steel by VZE in 1.0 mol/L hydrochloric acid solution was investigated by means of mass loss measurement and electrochemical methods.The results showed that the best corrosion inhibition was achieved by a dose of 0.20 g/L VZE at 30℃,with a corrosion inhibition rate of 91.9%.The adsorption of VZE on the steel surface conforms to the Langmuir adsorption isotherm,and the adsorption type is a mixed adsorption type of combined physical and chemical adsorption.The dynamic potential polarization curve shows that VZE can inhibit both the cathodic and anodic reactions,and is a mixed inhibition type corrosion inhibitor.With the increase of VZE concentration,the electrochemical impedance spectrum capacitive arc increases significantly,the charge transfer resistance of steel increases,and the corrosion reaction rate decreases.In other word,the VZE can provide good corrosion inhibition for the cold rolled carbon steel in 1.0 mol/L hydrochloric acid solution.

关 键 词：香根草提取物 盐酸 钢 缓蚀 吸附 

分 类 号：TG172.42[金属学及工艺—金属表面处理]