Abstract
Three cupronickels and two brasses from commercial tubes for distillation-type desalination plants were investigated for corrosion resistance to flowing NH3− and H2S-contaminated NaCl solution. Tests of up to 60 days duration were carried out on tubular specimens mounted in a loop operated at 50°c and at flow rates up to 4 m/sec. Anodic polarisation slopes by potential sweep techniques, and also polarisation resistances, were determined as a function of the exposure time.
In both clean and NH3−contaminated solutions aluminium brass showed a better corrosion resistance than 70Cu30Ni(Fe) and 90Cu10Ni(Fe), for flow rates up to 3 m/sec. In the presence of S2− ions 70Cu30Ni(Fe) was superior to aluminium brass.
70Cu30Ni(Cr) appeared to be rather insensitive to the effects of flow rates from 1–4 m/sec, but corrosion kinetics in flowing solutions were markedly higher than in stagnant solutions.
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