表面技术2017，Vol.46Issue(4)：246-251,6.DOI:10.16490/j.cnki.issn.1001-3660.2017.04.040
硫酸介质中桂花果提取液对Q235钢的缓蚀作用
Corrosion Inhibition Effect of Osmanthus Fragrans Fruit Extract in 0.5M H2SO4 Medium on Q235 Steel
摘要
Abstract
The work aims to study corrosion inhibition effect and mechanism of osmanthus fragrans fruit extract on Q235 steel in 0.5 mol/L sulphuric acid solution medium. The inhibition performance of osmanthus fragrans fruit extract to Q235 steel in 0.5 mol/L sulphuric acid solution medium was studied in electrochemical methods including weight loss method, polarization curves and electrochemical impedance spectroscopy (EIS). Effects of osmanthus fragrans fruit extract concentration on inhibi-tion efficiency at 25℃ were investigated extract. The inhibition mechanism extract was discussed as well. The osmanthus fra-grans fruit extract prepared with 95% alcohol as extractive solvent exhibited excellent corrosion inhibition effect on Q235 steel in 0.5 mol/L sulphuric acid solution medium. The inhibition efficiency increased as the concentration of osmanthus fragrans fruits extract increased, and the inhibition efficiency was up to 92.90% when the concentration of osmanthus fragrans fruit ex-tract was 10 g/L. Electrochemical test results showed that the osmanthus fragrans fruits extract was a mixed-type inhibitor which inhibited corrosion of Q235 steel mainly by inhibiting hydrogen evolution process on the cathode, and the inhibition mechanism belonged to geometric blocking effect. The adsorption of effective inhibition part on the Q235 steel surface accorded with the Langmuir isothermal equation, and the adsorption equilibrium constant was 1.09 L/g.The osmanthus fragrans fruits extractis a natural and green corrosion inhibitor having wide application prospect, which has significant corrosion inhibition effect on Q235 steel in 0.5 mol/L sulphuric acid solution medium.关键词
桂花果提取液/硫酸/Q235钢/缓蚀作用/极化曲线/电化学阻抗谱Key words
osmanthus fragrans fruit/hydrochloric acid/Q235 steel/corrosion inhibition/polarization curve/electrochemi-cal impedance spectroscopy分类
矿业与冶金引用本文复制引用
文家新,何建新,刘云霞,周永福..硫酸介质中桂花果提取液对Q235钢的缓蚀作用[J].表面技术,2017,46(4):246-251,6.基金项目
重庆市教委资助项目(KJ122103) Supported by the Education Commission of Chongqing(KJ122103) （KJ122103）
