The effect of different rolling methods on the microstructure and corrosion behavior of AZ31 magnesium alloy in a 3.5% NaCl solution was studied via potentiodynamic polarization scanning, constant current discharge and electrochemical impedance spectroscopy. Results show that the corrosion current densities of cross rolling and unidirectional rolling are 8.60�10-3 and 4.68�10-2 A/cm2, respectively. Their difference is 5.4fold, the charge transfer resistance of cross rolling is large, the corrosion of one-way rolling is more serious than that of cross rolling, the discharge performance of cross rolling is more stable, and the anode polarization is small. After cross rolling, the grain size of the plate is relatively uniform and the corrosion products are non-adherent and less, so it is easy to fall off from its surface, which increases the effective contact between the electrolyte and the alloy surface and has more stable discharge performance.
Process of horizontal twin roll casting magnesium alloy was analyzed by
numerical simulation. Taking solidification welding line in cast rolling
area as research object, the characteristic change of solidification welding
line caused by casting rolling temperature, casting rolling speed and roll
heat transfer capacity and its influence on the forming process of casting
rolling area were analyzed. The results show that increasing casting
temperature, casting speed or reducing heat transfer capacity of roll can
make solidification welding line shift to exit of casting rolling zone.
Increasing casting temperature and casting speed will increase difference
between middle and edge of the solidification welding line along casting
direction. And heat distribution of whole slab is more uniform. However,
effect of improving heat transfer capacity of roll is completely opposite.
According to this, optimum process parameters of casting and rolling
magnesium alloy with plate thickness of 6 mm are put forward to reduce
probability of edge crack.
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