WELD OVERLAYING FOR MARINE CORROSION RESISTANCE

In marine conditions, Inconel Alloy 625 is immune to crevice corrosion and to chloride-ion stress-corrosion cracking. It can be depositied by welding to produce the intrinsic corrosion resistance of the solid alloy. Furthermore of the alloys used for cladding or overlaying, it is one of the most weldable by all commonly used techniques. Inconel alloy 625 withstands a wide variety of severe corrosive situations. In fresh and sea water, neutral salts, and alkaline media there is almost no attack. In more severely corrosive environments, such as those found in the North Sea, the high chromium content resists oxidysing chemicals, while the high nickel and molybdenum contents supply resistance to reducing conditions. Niobium stabilises the alloy against sensitisation during welding, thereby preventing subsequent intergranular corrosion. Weld overlays made with Inconel filler metal 625 and Inconel welding electrode 112 are used on ships' propellers, on the exposed portion of the flanged shafts of ships fitted with controllable-pitch propellers, and on the shaft between the propeller hub and shaft sleeve. Such protection on the wearing surfaces of stabilisers, hydroplanes, and tailshafts is now well established practice by Ministry of Defence (Navy). Other potential uses include periscope housing, O-ring seals and glands, submarine hatches, hull valves, and pump joint assemblies. Order from BSRA as No. 49,211.

  • Corporate Authors:

    IPC Science and Technology Press Limited

    IPC House, 32 High Street
    Guildford, Surrey  England 
  • Authors:
    • White, T H
    • Davis, RVV
  • Publication Date: 1978-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00185304
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM