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

4.5.15 Ultraviolet fluorescence (applicable to primers of all types, all classes, all grades). Mix primer in

accordance with the manufacturer's data sheet. Apply primer to any convenient substrate. Cure hard. In a darkened

room, use a Spectroline BIB-150B Black Light Lamp (KTA-TATOR, Inc.) or equivalent 365-nanometer ultraviolet

black light, to illuminate the primer. Determine if primer fluoresces uniformly and is sufficiently bright to easily

ascertain presence of primer on all coated portions of substrate. Result shall be in accordance with the requirements

of 3.18.

4.5.16 Cathodic protection (CP) compatibility. Two steel panels shall be prepared as specified in 4.5.2 and

electrically connected to a commercial magnesium anode conforming to ASTM G8 and shall have a 0.25-inch

(nominal) hole drilled through the coating to the metal at the center of the test panel. The electrical resistance

between a point on the surface of the anode and the metal in the drilled hole of the test panel shall be less than 0.01

ohms, when checked with an ohm meter. Connecting points on the test panel shall be coated with an epoxy

compound for insulation. The test panel shall be installed in a modified ASTM G8 test in such a manner as to

separate the test panel from the magnesium anode by 2 feet (nominal) for a period of 3 months. At the completion

of the 3-month test, inspect each test panel for peeling, flaking, blistering, dissolving, or other failure. Lifting,

peeling or undercutting around the drilled hole shall be measured. Test results shall be in accordance with the

requirements of 3.5.

4.5.17 Surface tolerant coating systems (Class 15) (not applicable to Types VIII or VIIIa). Establish a uniform

rusted condition over the entire surface of six steel panels (150 by 300 by 3 millimeters (6 by 12 by 0.125 inch)) by

exposure for 300 hours in an ASTM B117 test apparatus. Surface preparation and paint application shall be as

follows:

a. The first pair of panels shall be painted with the coating system applied to one panel in the clean, dry, SP

15 condition and one panel in the SP 15 condition, but covered with a uniform film of oil similar to 10W40 motor

oil. The film of oil shall be established by wiping an oil soaked rag over the panel until a uniform film is

established. There shall be no "pooling" of oil on the surface. Paint the oily panel in accordance with the

manufacturer's instructions and cure in accordance with the manufacturer's instructions, but for a minimum of 7

days. Immerse both panels for ten cycles, or to prior failure, in the desired test medium. At the end of the ten

cycles, remove from the desired test medium, dry for 48 hours and determine compliance with 3.19. Test for

adhesion by ASTM D4541, Type II tester.

b. The second pair of panels shall be painted with the coating system applied to one panel in the clean, dry,

SP 15 condition and one panel in the SP 15 condition, but covered with a uniform film of water. The film of water

shall be established by wiping a sea water soaked rag over the panel until a uniform film is established. There shall

be no "pooling" of water on the surface. Paint the wet panel in accordance with the manufacturer's instructions and

cure in accordance with the manufacturer's instructions, but for a minimum of seven days. Immerse both panels for

ten cycles, or to prior failure, in the desired test media. At the end of the ten cycles, remove from the desired test

medium, dry for 48 hours and determine compliance with 3.19. Test for adhesion by Method ASTM D4541, Type

II tester.

c. The third pair of panels shall be painted with the coating system applied to one clean, dry panel prepared in

accordance with SP-2, and one panel prepared in accordance with SP-2, but do the surface preparation of the second

panel underwater (sea water). Paint the first panel in the dry condition and paint the second panel underwater in

accordance with the manufacturer's instructions and cure the second panel underwater in accordance with the

manufacturer's instructions. Immerse both panels in sea water for 6 months, remove the panels, dry for 48 hours

and determine compliance with 3.19. Test for adhesion by Method ASTM D4541, Type II tester.

4.5.18 Bilge coating systems (Class 17). Bilge coating systems shall be tested in accordance with the following

test sequence:

a. Paint and cure two steel test panels (150 by 300 by 3 millimeters (6 by 12 by 0.125 inch)) with one coat of

Navy Formula 150 (Type IV) and one coat of Navy Formula 156 (Type IV). Observe the dry through times of MIL-

DTL-24441. Scribe one panel to the metal substrate with an "X" and expose both panels for 300 hours in an ASTM

B117 test apparatus.