Aluminum-based alloys are widely used in sea water as galvanic anodes. Conversely, their use in soil is not recommended because they tend to passivate when chloride content is low. However, there are chloride contaminated soil where the use of aluminum anodes may be of interest. The aim of this research is to evaluate the effectiveness of aluminum galvanic anodes in low salinity solutions at different chloride/sulfate ratios. The research followed two phases: electrochemical characterization of anodes through potentiodynamic and free corrosion potential tests in solution with different chloride/sulfate concentration, and galvanic coupling tests performed in soil saturated with chloride solutions (diluted natural or artificial seawater until reaching: 2,000, 6,000 and 19,000 ppm chlorides). The potentiodynamic tests showed that pitting potential decreased as chloride concentration increased; sulfate ions exhibited a passivating effect or a potential nobilisation as also observed on free corrosion potential tests. In coupling tests, anodes showed an acceptable working potential also at lowest tested chloride concentration.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effectiveness of aluminum anodes for cathodic protection in low chloride environments


    Additional title:

    Wirksamkeit von Aluminiumanoden zum kathodischen Schutz in Medien mit geringem Chloridgehalt


    Contributors:
    Bolzoni, F. (author) / Contreras, G. (author) / Lazzari, L. (author) / Benedetti, A. (author) / Perez, E. (author)


    Publication date :

    2008


    Size :

    12 Seiten, 10 Bilder, 5 Tabellen, 12 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Cathodic protection by means of zinc anodes

    Bikkers, A.G. | Engineering Index Backfile | 1962


    Effectiveness of cathodic protection

    Ruck, G.T. / Thomson, N.G. / Birchmeier, J.R. et al. | Tema Archive | 1983


    Cathodic protection of active ship using zinc anodes

    Tytell, B.H. / Preiser, H.S. | Engineering Index Backfile | 1956


    Cathodic protection of ship hulls by galvanic anodes: Design evaluation

    Darchivio, F. / Cassanelli, A. / Simison, S. | Tema Archive | 2009


    Evaluation of zinc anodes for cathodic protection of ballast tanks

    Nelson, E.E. | Engineering Index Backfile | 1962