Corrosion resistance and XPS studies of Ni-rich Ni–Pd–P–B bulk glassy alloys

New Ni-rich Ni–Pd–P–B bulk glassy alloys with high glass-forming ability were formed by water quenching. The Ni60Pd20P17B3 and Ni65Pd15P17B3 alloys possess high corrosion resistance in 1N H2SO4 and 3 mass% NaCl solutions. In both solutions, their corrosion resistance decreases with increasing Ni content in the alloys. The origin of high corrosion resistance for the Ni60Pd20P17B3 alloy in the corrosive solutions is explained by formation of the Pd-enriched sub-surface layer, which is able to protect the alloy against the corrosion.