Corrosion properties of nickel-aluminium bronze in natural seawater-Effect of galvanic coupling to UNS S31603

The corrosion behaviour of galvanically coupled Nickel-Aluminium Bronze (NAB) and stainless steel (UNS S31603) during three weeks of exposure to natural seawater has been investigated. The approach included extensive testing of freely exposed NAB and cathodically polarized SS. The results imply that the galvanic current is limited by the cathode efficiency of SS, while the coupled potential is dictated by NAB. It is further reported that cathodic polarization of SS by NAB has a large effect on the cathode efficiency of SS.