Copper as Corrosion Resistance

All Copper alloys resist corrosion by fresh
water and steam. In most rural, marine and
industrial atmospheres Copper alloys also
resistant to corrosion. Copper is resistant to
saline solutions, soils, non-oxidising
minerals, organic acids and caustic
solutions. Moist ammonia, halogens,
sulphides, solutions containing ammonia
ions and oxidising acids, like nitric acid, will
attack Copper. Copper alloys also have poor
resistance to inorganic acids.
The corrosion resistance of Copper alloys
comes from the formation of adherent films
on the material surface. These films are
relatively impervious to corrosion therefore
protecting the base metal from further
attack.
Copper Nickel alloys, Aluminium Brass, and
Aluminium Bronzes demonstrate superior
resistance to saltwater corrosion.