Some 17 4PH propeller shafts showed severe localised corrosion after a long period of time in Ancona harbour. The shaft is concentrically mounted in an AISI 304 stern tube through two rubber bearings. Both 17 4PH and AISI 304 stainless steels were characterised by anodic polarisation in natural sea water, in order to obtain the necessary corrosion parameters for designing a suitable cathodic protection of the propeller system. The cathodic protection effectiveness was tested on a portion (about 1 m long) of this system. Two cathodic protection methods were tested: an impressed current cathodic protection at -0.3 V(SCE) and a galvanic cathodic protection. The tests were performed both in stagnant and in moving sea water and the results showed that these cathodic protection solutions were able to protect the propeller system; in particular some guidelines are suggested for both old and new ships. The zinc anode is good for protecting the whole system, but the potential of -0.9 V (SCE) is reached in stagnant water and therefore, the risc of 17 4PH hydrogen embrittlement can be present.


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    Title :

    Localised corrosion and cathodic protection of 17 4PH propeller shafts


    Additional title:

    Örtliche Korrosion und kathodischer Schutz von Propellerwellen 17 4PH


    Contributors:
    Bellezze, T. (author) / Roventi, G. (author) / Fratesi, R. (author)

    Published in:

    Publication date :

    2013


    Size :

    6 Seiten, 10 Bilder, 1 Tabelle, 15 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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