Corrosion of condenser tube materials in distilled water

This paper reports studies related to problems of vapour-side corrosion of copper/nickel alloys in multistage flash desalination plant. The main objec tive of the work was to obtain basic information and understanding of the c orrosion behaviour of copper/nickel alloys in distilled water over a range of relevant environmental conditions. Some attention was also devoted to ti tanium and an austenitic stainless steel. The experiments were conducted in controlled laboratory conditions with assessment of corrosion behaviour ma inly involving electrochemical monitoring. The results demonstrated a clear superiority of the Cu/30Ni alloy over Cu/10Ni material at ambient temperat ures and also nonprotective behaviour of both alloys upon initial exposure to distilled water at 80 degreesC. In the time scales of the experiments (u p to 15 days), no evidence was found that the presence of carbon dioxide at 80 degreesC made the water significantly more aggressive to the copper/nic kel alloys. The superiority of the Cu/30Ni alloy over Cu/10Ni at lower temp eratures did not appear to extend to the higher temperatures (80 degreesC) studied. Certainly at short exposure times, titanium and UNS S31603 stainle ss steel posses considerably superior corrosion resistance than the copper/ nickel alloys over the entire range of conditions studied.