%0 Journal Article
%T Corydalis yanhusuo extract as a green inhibitor for J55 steel in 3.5%NaCl solution saturated with CO2
%A Jinchang Wang
%A Wanying Liu
%A Xi Luo
%A Xuefeng Deng
%A Yuanhua Lin
%A Zhipeng Sun
%J Green Chemistry Letters and Reviews
%D 2019
%R https://doi.org/10.1080/17518253.2019.1642961
%X ABSTRACT In this study, Corydalis yanhusuo extract acts as a green inhibitor for J55 steel in 3.5% NaCl solution saturated with CO2. Rapid resolution liquid chromatography shows the concentrations of Palmatine to be 0.6358£¿g/L, Tetrahydropalmatine 0.7715£¿g/L, and Corydaline 0.3755£¿g/L. Potentiodynamic polarization results suggest that Corydalis yanhusuo extract is a mixed-type inhibitor. The inhibition efficiency of Corydalis yanhusuo extract increases with the increase of concentration and reaches 92.36% at 5%v/v but decrease with the increased temperature. The inhibition efficiency is 69% at 80¡ãC. The protective film formed on the metal surface was confirmed by Fourier transforms infrared spectroscopy, UV¨Cvisible, scanning electrochemical microscope and scanning electron microscope methods. The quantum chemical calculations predicate that Palmatine acts as the major component for inhibition performance. GRAPHICAL ABSTRAC
%U https://www.tandfonline.com/doi/full/10.1080/17518253.2019.1642961