The condensor tubes of MSF distillers of Water and Electricity Department of Abu Dhabi are made of either 90/10 or 70/30 Cu-Ni alloys or of Al-Brass and are mounted on 90/10 or 70/30 Cu-Ni tube plates. The tubes suffer pitting-, SCC and erosion corrosion from the water side and general attack from the vapour side. The resulting copper and nickel ions are potential health hazards and harmful pollutants to the environment. In the event of retubing, it is recommended to use more corrosion-resistant, environmentally more friendly tube material. High strength Mo-containing stainless steels qualify both reqirements. As they are going to be mounted on the already present copper-base tube plates, galvanic corrosion of the plates is liable to occur. The present study was undertaken to establish the extend of attack that would evolve and its dependence on operation variables. The study was carried out on six Mo-containing stainless steels with Mo contents varying between 0.3 weight-% and 6.0 weight-% and three copper-base alloys (90/10 and 70/30 Cu-Ni alloys and Al-bronze) in sterile Arabian Gulf Water. The study involved the measurement of the OCPs (open circuit potentials) of the single metals and the CPs (couple potentials) till constant values. The corrosion current produced upon coupling was followed simultaneously. The effects of varying cathode/anode surface area, of temperature and of stirring on these parameters were examinated in detail. The results obtained indicated that the stainless steel cathodes were more polarizable than the copper-alloy anodes. The CPs were very near to the OCPs of the anodes. The cathode polarizability decreased slightly with increase of cathode/anode are a ratio in the case of couples involving the 90/10 and 70/30 alloys, but was not affected in the case of Al-Bronze. The rates of galvanic attack of the copper alloys increased linearly with cathode/anode area ratios. Stirring increased the galvanic corrosion rates.


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    Titel :

    Galvanic corrosion of copper-base alloys in contact with molybdenum-containing stainless steels in Arabian gulf water


    Weitere Titelangaben:

    Elektrochemische Korrosion von kupferbasierenden Legierungen im Kontakt mit molybdänhaltigen Edelstählen in Arabischem-Golf-Wasser


    Beteiligte:
    Al Hossani, H.I. (Autor:in) / Saber, T.M.H. (Autor:in) / Mohammed, R.A. (Autor:in) / Shams El Din, A.M. (Autor:in)

    Erschienen in:

    Desalination ; 109 , 1 ; 25-37


    Erscheinungsdatum :

    1997


    Format / Umfang :

    13 Seiten, 6 Bilder, 8 Tabellen, 39 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




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