Ni and Cu can be mixed in any ratio to form a solid solution alloy, which is called Monel alloy. Ni-Cu has good resistance to HF, seawater brine and crevice corrosion. Monel alloy Ni70Cu30 is the earliest nickel-based corrosion resistant alloy. It has both high strength and toughness, and excellent resistance to corrosion by reducing acids and strong alkaline media and seawater.It is usually used to manufacture and transport hydrofluoric acid (HF), brine, neutral media, alkali salts and reduction Equipment for acidic media.