Electrochemical, quantum chemical and SEM investigation of the inhibiting effect and mechanism of ciprofloxacin, norfloxacin and ofloxacin on the corrosion for mild steel in hydrochloric acid

被引:21
作者
Pang XueHui [1 ]
Guo WenJuan [1 ]
Li WeiHua [2 ]
Xie JianDong [3 ]
Hou BaoRong [2 ]
机构
[1] Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Peoples R China
[2] Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
[3] Shandong Jianzhu Univ, Inst Design & Res, Jinan 250013, Peoples R China
来源
SCIENCE IN CHINA SERIES B-CHEMISTRY | 2008年 / 51卷 / 10期
关键词
inhibition; mild steel; polarization; electrochemical impedance spectroscopy; SEM;
D O I
10.1007/s11426-008-0099-z
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The inhibiting effect and mechanism of 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylicacid(ciprofloxacin), 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl)-3-quinoline carboxylic acid (norfloxacin) and (-)-(S)-9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-1-piperazinyl)-7-oxo-7 H-pyrido(1,2,3-de)-1,4-benzoxazine-6 carboxylic acid (ofloxacin) on the corrosion of mild steel in 1 mol/L HCl have been studied using electrochemical method, quantum chemical method and SEM at 303 K. The potentiodynamic results showed that these compounds suppressed both cathodic and anodic processes of mild steel corrosion in 1 mol/L HCl. The impedance spectroscopy showed that R-p values increased, and C-dl values decreased with the rising of the working concentration. Quantum chemical calculation showed that there was a positive correlation between some inhibitors structure properties and the inhibitory efficiency. The inhibitors function through adsorption followed Langmuir isotherm, and chemisorption made more contribution to the adsorption of the inhibitors on the steel surface compared with physical adsorption. SEM analysis suggested that the metal had been protected from aggressive corrosion because of the addition of the inhibitors.
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页码:928 / 936
页数:9
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