Preparation of amorphous Ni-W coating for the current collector of Na/S battery by electrodeposition

Stainless steel 430 (SS430) was usually used as current collector of sodium‑sulfur batteries, but it had limited corrosion resistance in high temperature sulfur environment. In this paper, the amorphous Ni-W coating was synthesized on the SS430 surface by the electrodeposition technique. The element Ce was added to improve the density of the coating moreover. Their structure and electrical conductivity were investigated by XRD, SEM, XPS and four probe tester respectively. The corrosion resistance of SS430 and two kinds of coatings had been studied in sulfur environment at 350 °C. The results indicated that amorphous Ni-W coating could slow down the corrosion of SS430 in high temperature molten sulfur environment and improve the conductivity. And the introduction of Ce could prompt the crystalline bulks refinement and the microstructure compact. The corrosion rate of Ni-W-Ce coating was 0.0612 mm/y after corrosion for 120 h in high temperature sulfur environment and the block resistance was 0.3055 mΩ.