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.

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MIL-STD-1568C

e. Chlorinated cutting oil

f. Halogenated hydrocarbons g. Methyl alcohol

5.3.2 Surface damage. Damage to any previously applied surface treatment or protective finish shall be repaired. Damage to surfaces that will become inaccessible because of mating

with other parts shall be touched up prior to mating. Organic coatings used for repair shall be the same as those on the undamaged areas.

5.3.3 Marking pencils. Ordinary lead pencils containing graphite shall not be used to mark metal parts. Nongraphitic marking pencils shall be used.

5.3.4 Cleaning after assembly. All closed compartments shall be cleaned after assembly to remove debris such as metal chips, broken fasteners, and dust. Particular attention shall be given to ensure that drain holes are not blocked.

5.3.5 Protection of parts during storage and shipment. All parts and assemblies shall be given adequate protection to prevent corrosion and physical damage during temporary or long term storage and shipment. Packaging practices shall conform to MIL-STD-2073-1.

5.4 Inorganic finishes.

5.4.1 Detail requirements. Cleaning, surface treatments, and inorganic finishes for metallic surfaces of aerospace weapons systems parts shall be in accordance with MIL-DTL-5002. Those parts or surfaces or parts, located in corrosion susceptible areas that form exterior surfaces of the system, shall require chemical finishing to provide maximum corrosion resistance.

5.4.1.1 Aluminum. All nonclad parts made from 7000 series aluminum alloys shall be sulfuric acid anodized in accordance with MIL-A-8625, Type II or chromic acid anodized, in accordance with MIL-A-8625, Type IB, Type IC, or Type IIB. All nonclad parts made from

2000 series aluminum alloys shall be anodized in accordance with MIL-A-8625, Type I or II. Clad 2000 and 7000 series aluminum alloys may be anodized in accordance with MIL-A-8625, Type I or II, or shall have a chemical conversion coating in accordance with MIL-DTL-5541 as a minimum corrosion preventative coating. All 5000 and 6000 series aluminum alloys shall have a chemical conversion coating in accordance with MIL-DTL-5541 as a minimum corrosion preventative coating. For galvanic couples, anodized coatings are preferred due to their low electrical conditions.

5.4.1.2 Cadmium coatings. Cadmium coatings for all steel parts including fasteners shall have a minimum thickness of 0.008 mm (0.0003 inch) and shall be subsequently treated with a chromate conversion coating. High strength steels having an ultimate tensile strength of 1241

MPa (180 ksi) and above, shall be plated with MIL-STD-1500, the vacuum deposition process in accordance with SAE AMS-C-8837, or SAE AMS-QQ-P-416, Type II, Class 2.