Corrosion behavior of 7A04 aluminum alloy deposited with sodium chloride in simulated environment

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 SO21%CO2air.