parkerizing - a rust-proofing process in which iron or steel is given a protective coating of phosphate by immersing it for a short time in a hot acidic solution of a metal phosphate (usu. manganese dihydrogen phosphate)
Hoop and strip, of iron or steel, hot-rolled or cold-rolled: ... C. Clad, coated or otherwise surface-treated: ... Other (for example, copper-plated, artificially oxidized, lacquered, nickel-plated, varnished, clad, parkerized, printed)
