This paper describes an investigation into the interrelationships between the performance of an impressed current cathodic protection (CP) system and the deposition of scale compounds in a seawater pipe system. Some experiments were conducted on a laboratory set-up but the emphasis was on tests on a 0.25 m diameter steel pipe fed by seawater flowing to a thermal desalination plant. The experimental approach involved monitoring the CP current as a function of time at various set potentials and correlating this data with evidence from visual inspection of the pipe-wall surfaces and small probe specimens. The influences of control potential and seawater flow rate at temperatures of 25-35°C were studied. Selected scale samples were subjected to examination by scanning electron microscopy and X-ray diffraction. The overall findings are discussed in terms of fundamental scale/CP-operation interactions and aspects relevant to practical operation of CP systems on seawater pipe installations.
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Research Article| January 01 2004
Influence of scale deposition on cathodic-protection performance in desalination plant conditions
Water Sci Technol (2004) 49 (2): 221–228.
T. Hodgkiess, N.A. Najm-Mohammed; Influence of scale deposition on cathodic-protection performance in desalination plant conditions. Water Sci Technol 1 January 2004; 49 (2): 221–228. doi: https://doi.org/10.2166/wst.2004.0129
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