Applications
 Click here for Ship Building and Repair |
 Click here for Offshore Units |
 Click here for Desalination |
 Click here for Power Generation |
Images provided by courtesy of the Copper Development Association Inc. (U.S.A.)
To have more information about Copper applications : » www.copper.org «
NITON 10 have an excellent behaviour when exposed to all forms of marine corrosion.
This property is mainly due to the fact that the alloy prevents dissolution by forming a very strong protective surface film.
NITON 10 and NITON 30 possible factors of corrosion
| Corrosive environment | Probable corrosion | Behaviour in service |
|---|---|---|
| Clean sea water circulation at a velocity of up to 1 m/s | Uniform or general | 0.0025 - 0.025 mm/year |
| Clean sea water circulation at a velocity of up to 3.5 m/s* : NITON 10 and 4.5 m/s* : NITON 30 | Impact corrosion | Satisfactory |
| Polluted sea water | General corrosion and accelerated pitting corrosion | Less resistance |
| Deposits accumulated at the surface | Local attack | Generally good |
| Corrosion + stress | Stress corrosion | Very resistant |
| * the local speeds resulting from obstructions can be higher | ||
Behaviour of NITON 10 and NITON 30 in the presence of sea water,
brine and sea atmospheric exposures
| Type of corrosion | Behaviour |
|---|---|
| General corrosion | Slightly sensitive to this type of corrosion Corrosion rate is less than 25 µ/year |
| Pitting corrosion | Insensitive to this type of attack Penetration rate less than 25/130 µ/year |
| Selective corrosion | Insensitive Do not lose the alloying component like brasses and aluminium bronzes |
| Stress corrosion | Never affected by this type of corrosion |
| Fouling corrosion | Insensitive Even at a low circulation speed, and although not affected by general corrosion, perfectly resist to the build-up of marine organisms |
| Corrosion-Erosion (impingement attack) |
Very slightly sensitive The addition of an optimum quantity of iron improves the nature of the protective film and makes the alloy very resistant to this type of agression |
| Galvanic corrosion | Insensitive in the presence of other copper based metals With a dissolution potential of 200 mv/ECS in sea water, NITON 10 is compatible with all other copper based metals |
Behaviour of NITON 10 and NITON 30 in other environments
- good resistance in an ammoniacal environment
- the behaviour of copper nickel in the presence of crude petroleum is correct in the vapour phase, with however, the risk of the protective film being destroyed
Resistance of NITON 10 to fire
Tests of resistance to fire have been made in simulating the service conditions of a pipeline during an offshore fire : piping empty - during 5 minutes - at 700 degrees Celsius, partly in the flame, then 15 minutes on water (with the start of the sprinklers).
They have shown the total reliability of NITON 10 : no rupture of the weld or of the brazing, no leakage, no permanent deformation.
After the end of the fire, the piping in NITON 10 has needed no replacement.
