吡唑的缓蚀作用及协同效应的研究
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摘要
本文综述了铜缓蚀剂的研究进展、缓蚀机理以及其协同作用。通过旋转圆盘的循环伏安曲线法、X-射线光电子能谱法、旋转挂片法等研究了在强酸性介质(0.5mol/L硫酸溶液)和弱碱性介质(0.05mol/L碳酸氢钠溶液、1.00mol/L碳酸钾+0.8mol/L碳酸氢钾溶液)中吡唑(Pz)对紫铜的缓蚀作用及机理,讨论了氯离子、次氯酸钠对吡唑缓蚀作用的影响。并吡唑与苯并三氮唑(BTA)和巯基苯并噻唑(MBT)的协同作用进行了研究。得出以下结论:
    1、在含吡唑的0.5 mol/L硫酸溶液中,紫铜的阳极溶解速度受电化学步骤和扩散步骤混合控制。
    2、吡唑在0.05mol/L碳酸氢钠溶液中在紫铜表面的吸附属于Frumkin等温吸附,紫铜的阳极溶解速度受电化学步骤控制。
    吡唑在紫铜表面形成的吸附膜主要是有Cu(II)、O、N和C,组成可能主要是Pz- Cu(II)。
    3、在0.05mol/L碳酸氢钠溶液中氯离子加速了紫铜的腐蚀速度。而一定浓度的次氯酸钠能使紫铜表面钝化,减慢紫铜的腐蚀速率。
    4、BTA、MBT在0.05mol/L碳酸氢钠溶液中在紫铜表面的吸附也遵从Frumkin等温吸附,紫铜的阳极溶解速度受电化学步骤和扩散步骤混合控制。
    5、吡唑与BTA、吡唑与MBT之间有一定的协同作用。前者在紫铜表面的吸附属于特殊等温吸附,后者在紫铜表面的吸附也遵从Frumkin等温吸附。
    吡唑与BTA协同时,紫铜表面膜层含有Cu(I)、Cu(II)、O、N和C,膜的组成可能为Cu-BTA-Pz的混合物。吡唑与MBT协同时,紫铜表面膜层含有Cu(I)、S、O、N和C,膜的组成可能为Cu-MBT-Pz的混合物。
The literatures of copper corrosion inhibitors were reviewed. The inhibitors(pyrazole(Pz)、benzotriazole(BTA)、2-mercaptbenzothiazole(MBT)) effect on the corrosion behavior of copper in 0.5mol/L H2SO4 solution 、0.05mol/L NaHCO3 and 1.00mol/L K2CO3+0.80mol/L KHCO3 solutions were studied and evaluated by cyclic voltammetry curves measurement 、XPS surface analysis technique and rotating disk electrode , and the synergistic effects among them. The influence of chloride、NaClO on pyrazole also were investigated. It was found that :
    
    The anodic dissolution of copper in 0.5mol/L H2SO4 solution contained pyrazole is determined (or controlled) by both the electrochemical step and diffusion step .
    
    The pyrazole adsorption on copper in 0.05mol/L NaHCO3 solution obeys the Frumkin adsorption isotherm, the anodic dissolution of copper is determined by the electrochemical.
    The out layer of the protective film formed by pyrazole on the surface of copper comprised Cu(II)、O、N and C. The protective film probably formed by Pz- Cu(II) and the inner CuO film.
    
    3、The chlorine ion accelerates the corrosion of copper in 0.05mol/L NaHCO3 solution. But the hypochlorite passives the copper and inhibits the corrosion.
    
    4、The BTA and MBT adsorption on copper in 0.05mol/L NaHCO3 solution also obeys the Frumkin adsorption isotherm, the anodic dissolution of copper is determined by both the electrochemical step and diffusion step .
    
    5、There was a synergistic effect between pyazole and BTA, their adsorption on copper in 0.05mol/L NaHCO3 solution obeys certain adsorption isotherm. There was a synergistic effect between pyazole and MBT, their adsorption on copper in 0.05mol/L
    
    
    NaHCO3 solution obeys Frumkin adsorption isotherm.
    The out layer of the protective film formed by pyazole and BTA on surface of copper comprised Cu(II)、Cu(I)、O、N and C. The protective film probably formed by the compound of Cu-BTA-Pz. The out layer of the protective film formed by pyazole and MBT on surface of copper comprised Cu(I)、S、O、N and C. The protective film probably formed by the compound of Cu-MBT-Pz.
引文
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