Effect of Intermediate Annealing on the Corrosion Resistance of Hot-rolled 5059 Aluminum Alloy

doi:10.3969/j.issn.1000-1093.2021.02.015

Abstract

Abstract: The 5059 aluminum alloy plates, such as hot-rolled plate, hot-rolled annealed plate, direct cold-rolled plate and cold-rolled annealed plate, were prepared with intermediate annealing and cold rolling to study the effect of intermediate annealing on the corrosion resistance of the alloy. The intergranular corrosion properties of different plates were analyzed according to U.S. ASTM G67-2013 standard. The results show that the partial recrystallization happens and the corrosion resistance of the plate is significantly improved after the annealing treatment of hot-rolled plate at 400 ℃ for 2 h. With annealing at 400 ℃ for 2 h, the corrosion weight loss of the hot-rolled plate decreases from 8.9 mg/cm² to 3.1 mg/cm², and the depth of corrosion channel on L-S cross-section decreases from 70 μm to 6 μm. The cold-rolled plates prepared with different states of the hot-rolled plates (with and without annealing) show quite different level of corrosion resistance. The corrosion weight losses of the cold-rolled plates with and without intermediate annealing are 17.3 mg/cm² and 9.5 mg/cm², and the depths of corrosion channel on L-S cross-section of the corresponding plates are 65 μm and 45 μm, respectively. The L-T and T-S cross-sections of hot-rolled plate present exfoliation corrosion morphology, and the L-T cross-section shows gully corrosion morphology. After annealing 400 ℃ for 2 h, the corrosion morphologies of 3 cross-sections are all transformed into pitting morphology.

Key words: 5059aluminumalloy, rolling, annealing, corrosionresistance, intergranularcorrosion

CLC Number:

TG166.3

LIN Hongcai, ZHU Qingfeng, SHI Ruwen, JIA Tao, ZHANG Enge, ZHAO Zhihao. Effect of Intermediate Annealing on the Corrosion Resistance of Hot-rolled 5059 Aluminum Alloy[J]. Acta Armamentarii, 2021, 42(2): 379-387.

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