Of the corrosion-resistant, wrought nickel alloys, those containing significant additions of both
chromium and molybdenum are the most versatile. Chromium promotes the passivation of such alloys
in the presence of oxygen, and molybdenum ennobles the alloys under active corrosion conditions.
Major attributes of these Ni-Cr-Mo alloys include high resistance to hydrochloric and sulfuric acids,
and outstanding resistance to chloride-induced localized attack. Despite their versatility, there is a
need within the chemical process and pharmaceutical industries for materials with even higher
resistance to hydrochloric and sulfuric acids. This need is partially satisfied by the binary nickelmolybdenum
alloys; however, these cannot tolerate even small quantities of dissolved oxygen. This
paper describes a new, wrought nickel alloy, much more resistant to hydrochloric and sulfuric acids
than the Ni-Cr-Mo materials, yet tolerant of dissolved oxygen and other oxidizing species.
Furthermore, the alloy is extremely resistant to chloride-induced pitting and crevice attack.