Corrosion resistance and flow velocities

The copper-nickel alloys are among the most corrosion-resistant copper materials. They are resistant to moisture, non-oxidising acids, alkaline and salt solutions and organic acids, as well as dry gases such as oxygen, chlorine, hydrogen chloride, hydrogen fluoride, sulphur dioxide and carbon dioxide.

They do not run the risk of stress crack corrosion, the tendency towards selective corrosion is extremely low and pitting corrosion is rarely observed. The resistance of copper-nickel alloys to seawater corrosion results from the formation of a thin, bonding protective layer, which naturally and quickly builds up when exposed to clean seawater.

CuNi10Fe1Mn is particularly characterised by its very high resistance level in seawater. The flow velocities are generally between 1 m/s and 3.5 m/s. However, higher flow velocities are possible in special application cases.