Palladium-Nickel alloys were originally developed as a low cost replacement for gold.
Contacts and connectors are typically plated with palladium/nickel and then flashed with gold, which reduces the cost significantly. Plating properties are similar to gold, with excellent corrosion resistance, low porosity, low contact resistance and good solderability.
Alloy deposits can range from 70 percent palladium to 80 percent palladium, with the balance made up by nickel.