Corrosion behavior of heat-treated and cryorolled Al 5052 alloys in different chloride ion concentrations

Abstract

Purpose This paper aims to investigate the corrosion behaviour of heat-treated and cryorolled Al 5052 alloys in different Cl− ion concentrations. Design/methodology/approach NaCl solutions with concentrations of 0, 0.5, 3.5 and 5.5 per cent were selected. Samples were subjected to pre-heat treatment (annealing at 300 °C and solution treatment at 540 °C) and cryorolling up to 30 per cent reduction before undergoing corrosion tests. The corrosion behaviour of the samples was then investigated by potentiodynamic polarization. The microstructure of the corroded samples was evaluated under an optical microscope, and the percentages of pits on their surfaces were calculated. Findings The cryorolled samples had a lower corrosion rate than the samples that were not cryorolled. The cryorolled sample that underwent solution treatment showed the highest corrosion resistance among all the samples tested. Practical implications The commercial impact of the study is the possibility of using the cryorolled Al alloy in various ion chloride environment. Originality/value The obtained results help in understanding the corrosion behaviour of cryorolled samples under different heat treatment conditions.

Improving Mechanical and Corrosion Behavior of 5052 Aluminum Alloy Processed by Cyclic Extrusion Compression

“…Figure 6 and Table 3 show that the corrosion current (icorr) decreases with the increment of the CEC pass number. This can be due to the facile formation of a protective oxide layer on the refined It was reported that Al5052 alloy has a favorable corrosion resistance mainly due to the fabrication of a protective surface oxide layer and has a low corrosion rate, especially in saline solutions and marine applications [51]. As it can be inferred from Figure 6, the corrosion resistance of Al5052 alloy is further promoted by the application of the CEC method.…”