MIL-STD-1568 Materials And Processes For Corrosion Prevention And Control In Aerospace Weapons SystemsThis standard establishes the requirements for materials, processes and techniques, and identifies the tasks required to implement an effective corrosion prevention and control program during the conceptual, validation, development and production phases of aerospace weapons systems. The intent is to minimize life cycle cost due to corrosion and to obtain improved reliability.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22

MIL-STD-1568C

5.4.1.3 Aluminum coatings. Aluminum coating per MIL-DTL-83488 or equivalent as approved by the procuring activity, may be considered acceptable alternative coatings to cadmium.

5.4.1.4 Magnesium. Magnesium alloys shall be treated in accordance with

ASTM D1732 prior to painting. Hole(s) drilled after finishes have been applied shall be treated in accordance with SAE AMS-M-3171,Type VI. Parts, subsequent to anodizing, may be given a surface sealing treatment in accordance with SAE AMS-M-3171, Type VII.

5.5 Organic finishes.

5.5.1 Detail requirements. All finishes and coatings shall be in accordance with

MIL-STD-7179.

5.5.1.1 Organic finishes and systems. The organic finishes or finish systems used shall provide the necessary protection against corrosion for all materials used in areas subjected to corrosive environments. All exterior paints and colors shall be consistent with thermal design requirements. The exterior paints and colors finish systems shall be MIL-PRF-85285 aliphatic polyurethane over MIL-PRF-23377, Type I or II, Class C1 or C2 or MIL-PRF-85582, Type I or II, Class C1 or C2 primer. This organic finish system is for temperature requirements to 350 °F (177 °C). All interior surfaces exposed to an exterior environment shall be considered as exterior finishes and shall be primed and top coated. Interior primer shall conform to MIL- PRF-23377, Type I, Class C1, or C2 or MIL-PRF-85582, Type I, C1, or C2 except in high temperature areas, the selected material shall be approved by the procuring activity. Integral fuel tank coatings shall meet the requirements of SAE AMS-C-27725. All exterior plastic parts that are subjected to rain or solid particle erosion shall be protected by coatings conforming to SAE AMS-C-83231 or

SAE AMS-C-83445. Materials other than those specified herein shall not be used unless approval has been obtained by the procuring activity (see 6.5).

5.5.1.2 Organic finish applications. The MIL-PRF-85285 aliphatic polyurethane coating shall be applied in two coats to a thickness of 0.045 to 0.058 mm (0.0017 to 0.0023 inch), for an overall average total topcoat thickness of 0.51 mm (0.0020 inch). Primers in accordance with MIL-PRF-23377, Type I or II, Class C1 or C2 or MIL-PRF-85582, Type I or II, Class C1 or C2 shall be applied to a thickness of 0.015 to 0.023 mm (0.0006 to 0.0009 inch), for an overall average primer thickness of 0.020 mm (0.0008 inch). Organic finishes shall be applied in accordance with MIL-F-18264.

5.5.1.3 Magnesium surfaces. Magnesium surfaces shall receive two coats of primer and two coats of topcoat prior to assembly. All faying surfaces shall be sealed with a corrosion inhibiting sealant conforming to MIL-PRF-81733 and all fasteners shall be wet installed with MIL-PRF-81733 sealant or MIL-PRF-23377 primer.