MIL-PRF-23236 Coating Systems For Ship StructuresThis specification covers four types of air pollution regulated ship and structure coatings that comply with the National Emission Standards for Hazardous Air Pollutants \(NESHAP\) for shipbuilding for state and federal regulations. There are nine classes of coating systems. There are four grades of coating systems based on temperature of application and cure. In addition to tanks, all paint systems qualified to this specification are suitable for use on any ship structures, interior or exterior, for corrosion control. Except for trace levels, all types are free of lead, chromium, cadmium, and asbestos \(see 3.2.3\). All types have levels of hazardous air pollutants \(HAPs\) that do not exceed applicable NESHAP levels \(see 3.2.2.2\). Dry Type V, VI, VII, and VIII coating residues and debris are non-hazardous waste under U.S. Environmental Protection Agency \(USEPA\) regulations in effect on the date of this specification. Type VII coating will not have any solvent added to either the base resin component or the hardener component.

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MIL-PRF-23236D

4.5.2.2.2 Cycle B. This test cycle shall be performed by Det Norske Veritas, N-1322, Hvik, Norway, phone

47 67 57 00, FAX 47 67 57 99 11 and shall be as specified in the test program described in Paper no. 505 of the

NACE Corrosion 96 Conference report. Surface preparation and paint application shall be as specified in 4.4 and

shall be performed by Marine Materials AS, unless special application equipment is required that is not available to

Marine Materials. With prior approval of NAVSEA, Marine Materials AS may arrange for application by others

with supervision by Marine Materials AS. If coating system is still satisfactory after twenty cycles in the wave test

chamber portion of the testing, surface prepare the tested coating as specified in 4.4. Recoat the central upper third

of one side of each panel as specified in 4.4 and conduct an additional five cycles of the wave chamber test. After

the additional testing in the wave chamber, the adhesion of the recoat and original coats shall be as specified in the

requirements of 3.9.2. After completion, all test panels shall be rated by the criterion of Paper no. 505 and assigned

a rating. This rating shall be as specified in the requirements of 3.9.2. Test results shall also be as specified in 3.9.2.

4.5.2.3 Potable and freshwater immersion (all types, Class 9, all grades). Class 9 coatings for use in dedicated

potable and freshwater tanks shall be tested to the following cycle with panels prepared as specified in 4.5.2:

a. Immerse two panels totally for 5 days in ASTM D1193 (any type) distilled water, at a temperature of

27�6 �C (80�10 �F).

Remove panels from test and allow to dry for 2 days.

c. Hot water immersion for 2 hours: This operation is intended to simulate conditions encountered in the use

of tank cleaning equipment. Following the drying period (see (b), immerse the panels totally in ASTM D1193 (any

type) distilled water for 2 hours at 80 �C (175 �F) (nominal).

Operations (a) to (c) constitute one complete test cycle. This cycle is repeated and coating deterioration

recorded after each complete cycle. If the coating is still satisfactory after twenty cycles, wipe lightly with a soft

cloth and freshwater, allow 48 hours to thoroughly dry, and recoat the upper one third of one side of each panel,

masking the portion from the edge to 13 millimeters (0.5 inch) inward, with one coat of the finish coat of the coating

system (or primer coat and finish coat if appropriate). Allow a 1-week dry time and complete immersion test with

five additional test cycles. Coating system shall be evaluated for pinhole rusting, ASTM D4541, Type II tester,

adhesion of both original and recoated surfaces, blistering and surface imperfections larger than 1.5 millimeters

(0.0625 inch) in diameter. Type VII coating systems shall be evaluated for edge rusting. Evaluation results shall be

as specified in 3.4.7.

4.5.2.4 Resistance to fuel and salt water at 32 C (90 F) (all types, Class 5, all grades). Panels shall be

prepared in accordance with 4.5.2 except for size. Two test panels approximately 60 by 120 millimeters (2.5 by

5 inches) shall be immersed in 500 millimeters (2 inches) of either natural sea water or ASTM D1141, substitute

ocean water solution covered by 50 millimeters (2 inches) of the fuel specified in 4.5.2.1(b) in a glass jar, closed and

sealed. The jar shall be kept at 32�3 C (90�5 F) by partial immersion in a water bath or other means for 240

hours. The panel shall be removed, immediately examined for any change in appearance, chalking or color change,

film failure such as blistering and rusting, loss of apparent hardness and adhesion of the coating, and edge rusting by

visual observation and Method 6304.2 of FED-STD-141 (knife used may be sharp commercial pocket knife). Panels

shall be in accordance with the requirements of 3.14.

4.5.3 Recoatability (except Types VIII and VIIIa). Recoatability for qualification of the coating system shall be

determined as specified in 4.5.2.1, 4.5.2.2, 4.5.2.3, 4.5.13, 4.5.14, and 4.5.17. Recoatability shall be in accordance

4.5.3.1 Recoatability (Types VIII and VIIIa). Recoatability of the Type VIII and VIIIa powder coatings shall

be demonstrated using the three-coat MIL-DTL-24441/29, Type III and the two-coat MIL-DTL-24441/35, Type IV

systems. Recoatability shall be as specified in 3.9.1, 3.9.2, 3.15, 3.16, and 3.17.

4.5.4 Test for aviation (JP-5 and F-76) fuel and gasoline (MOGAS and aviation gasoline) compatibility (Class 5

only). The effect of coating systems on fuel degradation shall be measured by comparison of test results obtained on

fuel in contact with the coating system and the same age unexposed fuel.