MIL-DTL-24625A(SH)
3.5.1.1 Platinized niobium rods (Grade C). Grade C anodes, when bent, shall be free of imperfections,
including cracking and non-adhesion, when viewed at up to 4 times magnification. Ductility shall be tested in
accordance with 4.4.3.
3.5.1.2 Adhesion. Adhesion of platinum plating to niobium substrate shall be tested in accordance with 4.4.2.
The coating shall follow the guidelines for satisfactory adhesion as described in each relevant test found in
ASTM B571.
3.5.2 Electrical cable. The surface of the electrical cable shall be without kinks, dents, cracks, and other defects
that may affect serviceability.
3.6 Reliability and maintainability (R&M).
3.6.1 Anode life. Anodes shall have an expected life equal to 50 percent of the rated output for a 20-year life,
but, in no case, less than 0.002-inch. The consumption factor to be assumed is 20 milligrams/Amp-year. The
density of platinum is 21.45 grams/centimeters-cubed.
3.6.1.1 Type II anode replacement time. Diver replaceable anodes shall have a mean time to repair (MTTR) of
one hour without the use of a cofferdam. All Type II anode metallic components exposed to seawater by the
installation process shall be fabricated from a platinum-plated niobium material to prevent corrosion upon
reactivation of the ICCP anode.
3.7 Operational requirements. Maximum operating current, operating (applied) voltage-to-current ratio, and
voltage at anode working surface when at maximum operating current under standard conditions shall be as
specified (see 6.2).
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2)
b.
Conformance inspection (see 4.3)
4.2 First article inspection. First article inspection shall be performed on three sample anodes. This inspection
shall include all tests of 4.4.
4.3 Conformance inspection. Conformance inspection shall include the tests of 4.4.1, 4.4.4, 4.4.6, and 4.4.8.
4.3.1 Lot. For the purpose of sampling, a lot shall consist of all anodes of the same type from the same
production run offered for delivery at one time. However, this lot shall not exceed a maximum of 200 prepared
anodes or 1,000 feet (ten 100-foot coils) of platinized niobium wire.
4.3.2 Sampling for examination. A random sample of prepared anodes shall be selected from each lot in
accordance with ASTM B602 at verification level II. Each sample specimen shall be examined to assure compliance
with 3.4.1 and 3.4.2.
4.3.3 Sampling for testing. Sampling for the purpose of testing shall be conducted as dictated by the individual
test procedures of 4.4.
4.4 Test procedures.
4.4.1 Appearance. The platinum coating shall be examined at up to 10 times magnification for conformance to
the requirements of appearance as specified in 3.5.1.
4.4.2 Adhesion. Adhesion shall be tested in accordance to ASTM B571. Tests referring to palladium coating
shall be used for the platinum coating of the anodes. Grade A anodes shall be tested in accordance with ASTM E8
tension testing of metallic materials.
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