(1. 中國電器科學研究院 工業(yè)產品環(huán)境適應性國家重點實驗室，廣州 510663；
2. 北京科技大學 腐蝕與防護中心，北京 100083)
摘 要: 在實驗室模擬條件下((25±2) ℃，相對濕度(95±5)%)，采用增重法、掃描電子顯微鏡、傅立葉紅外光譜和X射線衍射等方法研究氯化鈉和幾種模擬環(huán)境氣氛對7A04鋁合金大氣腐蝕行為的影響，并對其腐蝕機理進行討論。結果表明：表面沉積氯化鈉的7A04鋁合金在幾種模擬氣氛環(huán)境中均明顯地加速了材料的腐蝕；隨腐蝕時間的延長，腐蝕產物不斷增多；腐蝕產物微觀形貌呈團塊狀且凹凸不平；腐蝕增重∆m/A與暴露時間t之間符合指數衰減規(guī)律；氣氛腐蝕性由強到弱的順序為50×10−6 SO2＞1%CO2＞空氣。
關鍵字: 7A04鋁合金；大氣腐蝕；模擬環(huán)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
