The effect of environmental factors on long‐term atmospheric corrosion behavior of commercially pure aluminum AA1035

Abstract

Atmospheric corrosion behavior of a commercially pure aluminum AA1035 in rural environment with high Cl À deposition, urban, coastal, and industrial environments was investigated by over 20-year field test in China. AA1035 showed an accelerated corrosion rate in urban environment, a decelerated corrosion rate in industrial environment, and a constant corrosion rate in rural and coastal environment. The corrosion rate of AA1035 in industrial environment was approximately 1.5, 5.0, and 10.0 times as fast as that in coastal, rural, and urban environments, respectively. Moreover, AA1035 in coastal environment (Cl À deposition rate ¼ 45.54 mg Á m À2 Á d À1 ) and rural environment (Cl À deposition rate ¼ 25.62 mg Á m À2 Á d À1 ) suffered intergranular corrosion, and the maximum depth was about 250 and 50 µm after 20-year exposure, respectively. The higher the deposition rate of Cl À was, the more serious intergranular corrosion AA1035 suffered. In addition, in industrial and urban environments, AA1035 mainly suffered pitting corrosion, and the maximum pit depth was approximately 250 and 10 µm after 20-year exposure, respectively.