MIL-DTL-18001L
4.3.3.3 Bend test. Type ZRN anodes, selected in accordance with 4.3.3.1, shall be bent 45 degrees around a
mandrel that has a diameter of three times the thickness of the Type ZPN anode. Type ZPN anodes, selected in
accordance with 4.3.3.2, shall be bent 45 degrees around a mandrel of three times the diameter of Type ZPN anodes.
The anodes shall be bent in accordance with procedures specified in ASTM E290. After bending, the convex
surface of the specimens shall be inspected for cracking by visual examination. Any evidence of cracking shall
represent failure of the test and shall be cause for rejection of the entire lot.
4.3.3.4 Torsional shear test. Type ZRN anodes, selected in accordance with 4.3.3.1, shall be subjected to
torsional shear at a rate of 10 to 12 revolutions per hour using a Tinius-Olson torsional shear apparatus, or equal.
Failure of the anode to withstand a torsional shear of 12,000 lb/in2 (8,437,000 kg/m2) shall be cause for rejection of
the lot.
4.3.3.5 Steel strap/pipe core coating test. When the coating is cut or pried into, such as with a stout knife
applied with considerable pressure in a manner tending to remove a portion of the coating, it shall only be possible
to remove small particles of the coating by paring or whittling, and it shall not be possible to peel any portion of the
coating so as to expose the steel. Lack of adhesion of the zinc coating at bend or absence of zinc coating at cut
edges shall not be cause for rejection of fabricated anodes. Cracks in the base metal shall be cause for rejection.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point s packaging activities within the Military Service or
Defense Agency, or within the military service s system commands. Packaging data retrieval is available from the
managing Military Department s or Defense Agency s automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The anodes are primarily intended for use in corrosion prevention in seawater of surface ship
and submarine hulls, steel and aluminum equipment and structures, sea chests, sonar domes, mooring chains, and the
seawater side of condensers and other heat exchangers. The anodes may also be used for corrosion prevention of
pipe lines and other installations underground. The use of a particular anode is determined by the nature and
geometry of the structure to be protected. Refer to applicable installation instructions for types, amounts, locations,
and mounting of anodes.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Class and type (see 1.2).
c.
d. Style of Type ZEP, diameter of Type ZEP (Style B), pipe core size (3/8 inch or ½ inch); size of Type ZMP
(see figure 27); diameter of Type ZDM (see figures 23 to 26); diameter of Type ZRN required (see figure 23); Type
e.
Thickness of Type ZPN anode, whether ½ or 1 inch (see 3.3.2).
f.
Elongation of Type ZSS and ZBS anode straps (see 3.4.6).
g.
Packaging requirements (see 5.1).
h.
Total number of anodes required (see 6.3).
6.3 Ordering by quantity. The order for anodes should specify the exact number of anodes required (see 6.2).
See table IV for National Stock Numbers (NSN) for each anode type.
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