MIL-DTL-18001 Anodes, Sacrificial Zinc AlloyThis specification covers the requirements for zinc anodes \(galvanic protectors\) in the form of plates, slabs, discs and rods for corrosion protection \(cathodic protection\) of metals and alloys. It also includes features of anode design and fabrication such as cast-in cores for mounting purposes. The material described by this specification contains elements for which the Occupational Safety and Health Administration \(OSHA\) has set standards for exposure limits. Handling, storage, and application of this material should be in accordance with the most recent Code of Federal Regulations Title 29, Part 1910 and 1915 and any other safety and health regulations \(local or otherwise\) which may apply.

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MIL-DTL-18001L

3.7 Workmanship.

3.7.1 Zinc. The zinc anodes shall be free of flash burrs, cracks, blow holes, pipes, and surface slag consistent

with good commercial practice (see 4.2.2). The cast anodes shall be free of shrinkage cavities exceeding � inch

(6.35 millimeters) in depth, except that anodes 2 inches (50.8 millimeters) thick or more shall be free of shrinkage

cavities exceeding 3/8 inch (9.53 millimeters) in depth, when measured from a straight edge placed diagonally across

the opposite edges of the anode. For Type ZPN anodes, the shrinkage cavities shall be measured over a 12- by

12-inch (304.8- by 304.8-millimeter) area. In addition to the above allowable shrinkage cavities, surface

irregularities of the anode exceeding ⅛ inch (3.18 millimeters) in depth shall not be permitted on one face of slab or

disc type anodes unless at least ⅛ inch (3.18 millimeters) of sound metal covers the entire strap of core area. Types

ZDM, and ZRN anodes shall be smooth on their curved surfaces.

3.7.2 Metal cores. Metal cores extensions from the anodes shall be smooth and free of sharp burrs. The cast-in

cores shall have metallurgical bonds specified herein free of air pockets and inclusions consistent with good

commercial practice.

4. VERIFICATION

4.1 Conformance inspection. Conformance inspection shall include the examinations of 4.2 and the tests of

4.1.1 Lot. For the purpose of sampling, a lot shall consist of all zinc anodes of the same class and type, poured

or cast from one homogeneous heat or melt of a single charge or raw materials. The addition of any material to the

heat or melt at any time constitutes a new lot.

4.2 Visual and dimensional examination. Each anode selected in accordance with 4.2.1 shall be examined for

conformance to requirements of 3.3 through 3.7. If any anodes do not conform to 3.3 through 3.7, it shall be cause

for rejection of the entire lot.

4.2.1 Sampling for visual and dimensional examination. As a minimum, a sample quantity of anodes shall be

selected from each lot in accordance with table III. If one or more defects are found in any sample, the entire lot

shall be rejected. The contractor has the option of screening 100 percent of the rejected lot for the defective

characteristic(s) or providing a new lot which shall be inspected in accordance with the sampling plan provided

herein.

4.2.2 Examination procedure. Anodes selected in accordance with 4.2.1 shall be measured for weight and

dimension, and be visually inspected at 10 times the magnification for workmanship. No cracks with a surface

length greater than ⅛ inch (3.175 millimeters) shall be allowed. The entire lot of each type anode shall meet the

weight requirements as specified in 3.3.3. If the weight is less than the minimum weight for the type of anode

specified, it shall be cause for rejection of the entire lot.