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通过循环盐雾腐蚀实验模拟镀锌钢在酸雨大气环境中的腐蚀过程。采用腐蚀质量损失测试、扫描电镜(SEM)、能谱仪(EDS)和电化学技术分别对腐蚀48,84,132,180和228 h的镀锌钢试样进行测试分析,得到腐蚀动力学规律、腐蚀产物成分、锈层截面形貌以及表面锈层的电化学特性。研究了锈层对镀锌钢在酸雨条件下大气腐蚀的影响。动力学分析表明,腐蚀过程中镀锌钢的表面形成了具有较好保护性的锈层;电化学测试结果表明,锈层的保护性呈现随腐蚀时间的延长先增强后减弱的变化过程。
The corrosion process of galvanized steel in acid rain and atmospheric environment was simulated by cyclic salt spray corrosion experiment. The corrosive mass loss test, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and electrochemical techniques were used to test the galvanized steel specimens after 48, 84, 132, 180 and 228 h corrosion respectively. The corrosion kinetics law, , Rust layer cross-section morphology and the electrochemical properties of the surface rust layer. The effect of rust layer on atmospheric corrosion of galvanized steel under acid rain conditions was studied. Kinetic analysis shows that the surface of the galvanized steel during the corrosion process forms a rust layer with better protection. The electrochemical test results show that the protective layer of the rust layer presents the process of increasing and then decreasing with the increase of the corrosion time.