(1. 中国电器科学研究院 工业产品环境适应性国家重点实验室，广州 510663；
2. 北京科技大学 腐蚀与防护中心，北京 100083)
摘 要: 在实验室模拟条件下((25±2) ℃，相对湿度(95±5)%)，采用增重法、扫描电子显微镜、傅立叶红外光谱和X射线衍射等方法研究氯化钠和几种模拟环境气氛对7A04铝合金大气腐蚀行为的影响，并对其腐蚀机理进行讨论。结果表明：表面沉积氯化钠的7A04铝合金在几种模拟气氛环境中均明显地加速了材料的腐蚀；随腐蚀时间的延长，腐蚀产物不断增多；腐蚀产物微观形貌呈团块状且凹凸不平；腐蚀增重∆m/A与暴露时间t之间符合指数衰减规律；气氛腐蚀性由强到弱的顺序为50×10−6 SO2＞1%CO2＞空气。
关键字: 7A04铝合金；大气腐蚀；模拟环境
deposited with sodium chloride in simulated environment
（1. State Key Laboratory of Environmental Adaption for Industrial Products,
China National Electric Apparatus Research Institute, Guangzhou 510663, China;
2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China）
Abstract: The corrosion behavior of 7A04 aluminum alloy deposited with NaCl in several simulated environments ((25±2) ℃ and relative humidity (RH) (95±5)%) was investigated by mass gain method, Fourier transform infrared spectroscope, scanning electron microscopy and X-ray diffractometry. The corrosion mechanism for aluminum alloy was discussed. The results show that NaCl can evidently accelerate the atmospheric corrosion of 7A04 aluminum alloy in several simulated environments. The corrosion products increase with prolonging corrosion time. The surface observation reveals that the corrosion products are agglomerate and accidented. The relationship between mass gain of corrosion product and time accords with the exponential attenuation rule. The corrosion sequence of corrosion mediums from strong to ebb is 50×10−6 SO2＞1%CO2＞air.
Key words: 7A04 aluminum alloy; atmospheric corrosion; simulated environment
