ANTI-FOULING METALLIC MATERIALS FOR UNDERWATER SHIP HULLS (1ST REPORT)

Ten types of metallic materials including newly developed copper alloys were investigated, commencing with an immersion test in natural sea water. Four types of anti-fouling metallic materials were then investigated by an actual ship test conducted in the underwater hull of a car bulk carrier running for 16 months in the Pacific Ocean, in order to clarify the corrosion resistance, anti-fouling properties and surface roughness of the materials. The following results were obtained by these tests. (1) General corrosion was found on almost all specimens attached to the underwater hull of the car bulk carrier. There was no erosion found on any specimen of tested materials, though the speed of the carrier (7.8 m/sec.) exceeded the critical flow velocities (1.3 m/sec.) for copper and copper alloys in the heat exchangers using sea water. (2) The anti-fouling properties of copper and copper alloys were maintained with the dissolution of copper, that is the corrosion of copper and copper allows. (3) There was slime attached to only a specimen of 90/10 Cu-Ni alloy mounted on the underwater hull. It was considered that in the case of 90/10 Cu-Ni alloy there was a possibility that the necessary anti-fouling properties were not obtained for the underwater hull. (4) The surface roughness of all specimens attached to the underwater hull was in the range of 40 mu m, which was smaller than that of ordinary anti-fouling paints. See also the following abstract.

  • Supplemental Notes:
    • Soc Naval Arch Japan J, v 168 n 2, Dec 1990, p 471 [7 p, 6 ref, 5 tab, 11 fig]
  • Authors:
    • Zama, M
    • Kinoshita, H
    • Saito, M
  • Publication Date: 1990

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00716253
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM