山梨酸钾与Zn^2+在NaCl溶液中对Q235钢的缓蚀协同作用  

Synergistic Inhibition Effect of Potassium Sorbate and Zn^2+ Ions on Corrosion of Q235 Steel in NaCl Solution

作　　者：王凤平[1] 胡晓强 丁言伟[1] 李杰兰[1] 张薇 WANG Fengping;HU Xiaoqiang;DING Yanwei;LI Jielan;ZHANG Wei(College of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China)

机构地区：[1]辽宁师范大学化学化工学院,辽宁大连116029

出　　处：《应用化学》2020年第8期960-968,共9页Chinese Journal of Applied Chemistry

基　　金：辽宁省教育厅科学技术研究项目(LF201783609)资助。

摘　　要：采用失重法、电化学法、X射线光电子能谱(XPS)和扫描电子显微镜(SEM)研究了0.5 mol/L NaCl溶液中,山梨酸钾(PS)与Zn^2+对Q235钢的缓蚀协同效应。失重实验结果表明,在0.5 mol/L NaCl溶液中,PS对Q235钢具有一定的缓蚀效果,缓蚀效率随PS质量浓度的增加而增大,当添加PS的质量浓度为25.0 g/L时,最大缓蚀效率仅为38.37%,而PS与Zn^2+复配后存在显著的缓蚀协同作用,缓蚀效率高达91.03%。动电势极化结果表明,PS与Zn^2+混合物可同时抑制Q235钢的阴、阳极反应,属于阳极型缓蚀剂。阻抗谱表明,该混合物可在电极表面形成致密的保护膜。XPS分析证明保护膜是由PS、铁的氧化物/氢氧化物和Zn(OH)_2沉淀组成。The synergistic inhibition effect of potassium sorbate(PS)and Zn 2+ions on the corrosion of Q235 steel in 0.5 mol/L NaCl solution was studied by weight loss method,electrochemical method,X-ray photoelectron spectroscopy(XPS)and scanning electronic microscopy(SEM).The results of weight loss measurement show that potassium sorbate has some inhibition of corrosion of Q235 steel in 0.5 mol/L NaCl solution,the inhibition efficiency increases with the increase of concentration.When the added PS concentration is 25.0 g/L,the maximum inhibition efficiency is 38.37%.The combination of PS and Zn 2+ions has a significantly synergistic inhibition effect,the corrosion inhibition efficiency is as high as 91.03%.Potentiodynamic polarization shows that the mixture of PS and Zn 2+ions can simultaneously inhibit the cathodic,anodic corrosion reactions of Q235 steel,belonging to an anodic-type corrosion inhibitors.Impedance spectroscopy shows that the mixture can form a dense corrosion inhibitor film on the electrode surface.XPS analysis confirms that the corrosion inhibitor film consists of potassium sorbate,iron oxide/hydroxide and Zn(OH)2 precipitate.

关 键 词：山梨酸钾 ZN^2+ Q235钢 NACL溶液 缓蚀协同效应 

分 类 号：O646[理学—物理化学]