Amorphous Al-Mn coating on NdFeB magnets: Electrodeposition from AlCl3-EMIC-MnCl2 ionic liquid and its corrosion behavior

► Amorphous Al-Mn alloy coating was electrodeposited on NdFeB magnet from ionic liquid. ► To remove the surface oxides of NdFeB, anodic etching pretreatment is used. ► The deposited Al-Mn alloy coating shows high adhesion to the NdFeB substrate. ► Corrosion tests show that amorphous Al-Mn alloy coating is anodic coating for NdFeB magnet.