采用現(xiàn)場(chǎng)暴曬試驗(yàn)，研究了7A04和2A12兩種鋁合金在吐魯番干熱大氣環(huán)境中的腐蝕行為和機(jī)理。1 a暴露后的失重分析發(fā)現(xiàn)7A04的腐蝕速率大于2A12; 采用SEM和EDS觀察分析了兩種合金表面的腐蝕產(chǎn)物，結(jié)果表明，均主要由鋁的氧化物和氫氧化物組成。去除腐蝕產(chǎn)物后， 7A04表面呈現(xiàn)大量密集腐蝕坑，而2A12表面腐蝕坑則較少。EIS結(jié)果表明，兩種合金的腐蝕產(chǎn)物層電阻電容差別較大，帶腐蝕產(chǎn)物2A12的耐蝕性優(yōu)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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