چكيده به لاتين
Abstract
One of the problems hindering the adequate application of Lead-Acid batteries is corrosion, which occurs on the anode and cathode plates inside the battery. In this study, the accumulative roll bonding (ARB) and annealed methods were used to enhance specific mechanical properties and corrosion resistance attributes in sheet metals. Within this study, sheet metals with 2, 4, 8, 16, 32, and 64 layers were fabricated using the ARB method. Also, eight samples were annealed at 80°C, 120°C, 160°C and 200°C for 10 and 20 minutes and the other five samples were annealed at 100°C for 30, 60, 90, 120 and 300 minutes. Mechanical properties such as yield strength, elongation, and hardness were measured by tensile and micro-hardness tests. The typical corrosion resistance attributes, including corrosion rate and corrosion current, were also measured by the Tafel test. Metallography and fractography evaluations were used for additional investigations and results analysis.
According to ARB tests and experimental characterizations, it was observed that a higher number of rolling steps led to decreased yield strength (78.44MPa to 34.07MPa) and increased elongation (20.26% to 111.51%). Surprisingly, after 1 hour of heat treatment, increased strength (93.85 MPa to 120.85 MPa) resulted in the annealed samples. However, except minor cases, annealed samples at different temperatures and times exhibited lower yield strength and better ductility. Microhardness test exhibited that the ARB specimens had decreased hardness, but no significant changes were observed for those annealed specimens at 100 °C. According to Tafel test, the ARB specimens had a lower corrosion rate than annealed specimens. Better performance was observed in those annealed samples, tempered 100°C within 0-1.5 hours. Subsequently, better performance was also at 120 °C and 200°C. Based on fractography tests.
