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使用石英晶体微天平(QCM:quartz crystal microbalance)为主要手段研究了在 85%RH相对湿度)和 NaCI存在的条件下,金属Zn在不同CO2浓度下的大气腐蚀动力学,同时结合 X射线衍射(XRD)和扫描电镜(SEM)研究了Zn在薄液膜下的大气腐蚀机理,并用扫描电子显微#(SEM)对腐蚀产物进行形貌分析,阐述了腐蚀产物的保护特征.实验结果表明,在薄液膜下,NaCl的存在使金属Zn表面生成一层具有良好保护性的膜,对Zn的 CO2大气腐蚀具有缓蚀作用,所以,NaCl和CO2的相互作用对 Zn的大气腐蚀具有协同效应.
The atmospheric corrosion kinetics of metal Zn under different CO2 concentrations was studied by using Quartz crystal microbalance (QCM) as the main method to study the atmospheric corrosion kinetics under the conditions of 85% RH and NaCI, and combined with X-ray diffraction X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the mechanism of atmospheric corrosion of Zn under thin liquid film. The corrosion products were characterized by scanning electron microscopy (SEM). The experimental results show that under the thin liquid film, the presence of NaCl produces a protective film on the surface of metal Zn, which has a corrosion inhibition effect on atmospheric CO2 corrosion of Zn. Therefore, the interaction between NaCl and CO2 has a negative effect on the atmosphere of Zn Corrosion has a synergistic effect.