采用现场暴晒试验，研究了7A04和2A12两种铝合金在吐鲁番干热大气环境中的腐蚀行为和机理。1 a暴露后的失重分析发现7A04的腐蚀速率大于2A12；采用SEM和EDS观察分析了两种合金表面的腐蚀产物，结果表明，均主要由铝的氧化物和氢氧化物组成。去除腐蚀产物后，7A04表面呈现大量密集腐蚀坑，而2A12表面腐蚀坑则较少。EIS结果表明，两种合金的腐蚀产物层电阻电容差别较大，带腐蚀产物2A12的耐蚀性优于7A04。
The corrosion behavior and mechanism of 7A04 and 2A12 aluminum alloys exposed for 1 year in the hot and dry atmosphere environment in Turpan were studied.The results of weight lose tests showed that the corrosion rate of 7A04 aluminum alloy was greater than that of 2A12.The results of scanning electron microscopy(SEM)and energy dispersive spectra showed that the corrosion products on the surface of the aluminum alloys were composed of aluminum oxides and hydroxides.After removal of corrosion products,the number of corrosion pits on 7A04 aluminum alloy was more than that on 2A12.The results of electrochemical impedance spectroscopy showed that the resistance and capacitance of corrosion product layer had large difference between the two kinds of aluminum alloys, 2A12 aluminum alloy with corrosion products had better corrosion resistance than 7A04 aluminum alloy.
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