Influence of short annealing treatment on corrosion behaviour of cryorolled commercially pure aluminum

摘要

Purpose - The purpose of this paper is to study the corrosion behavior of as-cryorolled and cryorolled-short annealed commercially pure aluminum (CP-Al) in 3.5 percent NaCl solution. Design/methodology/approach - Cast and homogenized CP-Al samples are cryorolled from 7 to 0.7 mm at -80° C. Samples are short annealed at 125, 150 and 175° C for 3 min. Transmission electron microscope studies are performed to understand the effect of cryorolling and short annealing on microstructure. Corrosion behavior of these samples in 3.5 percent NaCl solution is evaluated by potentiodynamic polarization studies. Findings - Though cryorolling adversely affects corrosion resistance of CP-Al, short annealing can restore the loss in corrosion resistance partially by the recovery process. The extent of restoration of loss in corrosion resistance by short annealing is influenced by the texture. Originality/value - The results obtained by this investigation help in understanding the effect of cryorolling and short annealing on corrosion behavior of CP-Al.