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Kongsberg EM 712 Maintenance Manual
Inspecting and replacing sacrificial anodes
Anodes are used on various units to prevent metals from corroding in salt water.
Context
Anodes are constructed of a metal alloy with an active voltage that is greater than the
metal of the structure; thus, the anode corrodes before the material it is protecting. The
three main alloys used are magnesium, aluminum, and zinc.
The sacrificial anodes must be inspected every time the vessel is in dry dock. Replace
the anodes if they are damaged or severely corroded.
Procedure
1
Inspect all anodes for damage and corrosion.
2
Loosen the mounting screws and remove the anode.
3
Clean the new anode and mounting surface using Isopropyl alcohol on a soft cloth
or paper wipe.
4
Grease the mounting screws and threads with Aqua Shield or Molykote P-40 paste.
5
Mount the new anode using the same screws. Make sure there is good electrical
contact with the unit.
40
451106/B
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