(1. 中國(guó)電器科學(xué)研究院 工業(yè)產(chǎn)品環(huán)境適應(yīng)性國(guó)家重點(diǎn)實(shí)驗(yàn)室，廣州 510663；
2. 北京科技大學(xué) 腐蝕與防護(hù)中心，北京 100083)
摘 要: 在實(shí)驗(yàn)室模擬條件下((25±2) ℃，相對(duì)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(duì)7A04鋁合金大氣腐蝕行為的影響，并對(duì)其腐蝕機(jī)理進(jìn)行討論。結(jié)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(shí)間的延長(zhǎng)，腐蝕產(chǎn)物不斷增多；腐蝕產(chǎn)物微觀形貌呈團(tuán)塊狀且凹凸不平；腐蝕增重∆m/A與暴露時(shí)間t之間符合指數(shù)衰減規(guī)律；氣氛腐蝕性由強(qiáng)到弱的順序?yàn)?0×10−6 SO2＞1%CO2＞空氣。
關(guān)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
