Localised or pitting corrosion can be detrimental for steel pipes and containment structures, since wall perforation may cause system failure. Herein maximum pit depth quantification and its development with time are considered for samples taken from longitudinal welds on 33-year-old tubulars exposed in Newcastle Harbour. Relationships between pit depth and material metallurgy and corrosion properties were investigated by means of standard macro-etching, rest potential and zero resistance ammetry techniques. It is considered that the observed results are the result of the lack of homogeneity at the corrosion interface caused by differences in grain size, grain structure and the potential for pitting to occur preferentially along boundaries. The results are compared to measurements for longitudinal welds obtained previously on samples of API X56 Spec 5L pipe exposed in similar waters for up to 3.5 years, showing a reasonable degree of consistency between the two sets of data. The reasons for this are discussed. The results are compared with the results and trends reported earlier (I.A. Chaves and R.E. Melchers, Corr. Sci., 53 (2011), S. 4026-4032) for maximum pit depth measured on steel welded pipe coupons exposed to similar Pacific Ocean seawater for up to 3.5 years.


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    Title :

    Long term localised corrosion of marine steel piling welds


    Additional title:

    Örtliche Langzeitkorrosion an geschweißten Pfahlkonstruktionen aus Schiffsbaustahl


    Contributors:

    Published in:

    Publication date :

    2013


    Size :

    6 Seiten, 12 Bilder, 2 Tabellen, 28 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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