Abstract
Abstract The corrosion behaviour of copper-nickel alloys in sulphide polluted sea water has been investigated under simulated jet impingement conditions. At high impingement velocity, corrosion of these alloys decreased with increasing sulphide concentration. A new mechanism is proposed to explain this unexpected behaviour, which is attributed to the sweeping away of corrosive agents at higher jet velocities. In addition it was found that complexing agents such as Erichrome Black–T (EBT) can render sulphide more aggressive and enhance the susceptibility to corrosion. The proposed mechanism is capable of explaining this synergy. It can be concluded that at high jet velocities and long exposure times sulphide ions alone are not as deleterious as has been previously believed.
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