This specification covers the basic requirements for barrel or rack electrodeposited zinc alloy plating over a ferrous substrate. Four alloy plating’s are covered by this specification: zinc cobalt, zinc nickel, zinc iron and tin zinc. Zinc alloy plating is especially suitable for small to medium ferrous parts such as castings, fasteners, stampings, clips and other parts where levels of corrosion protection exceeding pure zinc are required. Table 1 lists the zinc alloy finishes covered by this specification and their alloy concentration limits and % nominal. NOTE: This finish is not recommended for applications where white corrosion is a cosmetic concern.