Records obtained by B.S.R.A. over a number of years indicate that whereas about 15 years ago a ship's hull roughened at approximately 75 microns/year, the modern ship built from shot-blasted and primed plate and using a modern anti-corrosive paint system in conjunction with cathodic protection, roughens at the rate of 25 microns/year. A superficial examination of the combined paint types and designs of cathodic protection employed on modern ships leads to a consideration of what the optimum requirements are to ensure satisfactory protection of the steel hull and maximum economic life of the paint system. It can be accepted that an electrical potential of--800 mV with reference to a silver/silver chloride electrode will prevent steel corroding in sea water. The object of fitting a cathodic-protection system to a hull is therefore to obtain and maintain a uniform potential of--800mV over the underwater surface of the hull, and the difficulties experienced in trying to achieve this are discussed. Order from BSRA as No. 49,691.

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  • Supplemental Notes:
    • Paper presented at a conference on Hull Surface Maintenance: Its Role in Operating Economics organized by BSRA in 1977. Paper appeared in Motor Ship, Special Feature, Volume 58.
  • Corporate Authors:

    IPC Industrial Press Limited

    Dorset House, Stamford Street
    London SE1 9LU,   England 
  • Authors:
    • Trotman, D
  • Publication Date: 1978-4

Media Info

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Filing Info

  • Accession Number: 00195387
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 31 1979 12:00AM