Electrophoretically Deposited Graphene Oxide on La(Fe,Si)13 Magnetocaloric Alloys for Improved Corrosion Resistance

The durability of La(Fe, Si)13-based magnetocaloric alloys in magnetic cooling devices present challenges mainly due to the material's susceptibility to corrosion in water-related heat transfer fluids. This study proposes an electrophoretic deposition method to deposit graphene oxide coatings on LaFe13.9Si1.4 thin plates under various applied voltages. The results show that the coating prepared at 5 V significantly enhanced corrosion resistance, achieving an inhibition efficiency of 36 %. Additionally, the LaFe13.9Si1.4-GO sample exhibited no reduction in the maximum magnetic entropy change. This study demonstrates that graphene oxide coatings can serve as effective corrosion-resistant coatings for La-Fe-Si magnetocaloric alloys, offering guidance to ensure the integrity of magnetic cooling devices over long term.