药物莫西沙星对Q235钢在盐酸溶液中的缓蚀作用

摘要

为了探寻新的环境友好型缓蚀剂,采用电化学方法、失重法和量子化学计算研究了莫西沙星在1 mol/L HCl溶液中对Q235钢的缓蚀性能和缓蚀机理. 结果表明,莫西沙星对Q235钢在盐酸溶液中是一种良好的以抑制阴极为主的混合抑制型缓蚀剂,缓蚀效率随其浓度的增加而增大,但随温度增加而减小,35 ℃下,在其浓度为200 mg/L时,缓蚀效率达90%;莫西沙星在Q235钢表面的吸附为自发过程,且符合Langmuir和El-Awady等温方程,同时,计算和讨论了相关的热力学和动力学参数. 此外,采用量子化学计算对莫西沙星的缓蚀机理进行了进一步的分析,结果发现,莫西沙星的缓蚀作用由物理吸附和化学吸附共同产生.%In order to develop new environment-friendly corrosion inhibitors, the corrosion inhibition of Q235 steel by moxifloxacin in 1 mol/L HCl solution and its mechanism were investigated using electrochemical measurements, mass loss method and quantum chemistry calculation.The results reveal that moxifloxacin is an effective mixed-type inhibitor with a predominantly cathodic action for the corrosion of Q235 steel in HCl solution.The inhibition efficiency increases with increased concentration of the inhibitor, but decreases with incremental temperature.The adsorption of moxifloxacin on steel surface is a spontaneous process, and obeys the Langmuir isotherm as well as the El-Awady thermodynamic-kinetic model.Accordingly, the thermodynamic and kinetic parameters were calculated and discussed.Moreover, quantum chemistry calculation was employed to give further insight into the inhibition mechanism of moxifloxacin, and the results showed that the corrosion inhibition of moxifloxacin was caused by physical adsorption and chemical adsorption.