MIL-DTL-5002E
3.7 Metallic-ceramic coatings.
3.7.1 Methods of application. Metallic-ceramic coatings shall be applied by spraying,
dipping, electrophoretic deposition, or thermal spraying methods in conformance with applicable
specifications, followed by a fusion or mechanical treatment, if applicable. Where thermal
application processes are used, in no case shall the part be subjected to a temperature that would
adversely affect its mechanical, corrosion, or stress corrosion properties. If the part is shot-
peened prior to coating, the thermal application shall not impair the effectiveness of the shot-
peening operation.
3.7.2 Metallic-ceramic coating. Metallic-ceramic coatings shall be used for surfaces subject
to oxidation, corrosion, galvanic corrosion, and for protection from corrosion due to other
environments (see 3.9). Metallic-ceramic coatings shall be in accordance with MIL-C-81751.
3.8 Surface treatments and oxide coatings.
3.8.1 Secondary passivation. Also designated as post-treatment, sealing, conversion
coating, or rinsing. Most sacrificial metallic coatings, anodizes, and phosphates require a post-
treatment passivation for optimum corrosion and adhesion performance. Secondary passivation
of these processes shall be required unless deviation is authorized by the cognizant engineering
organization.
3.8.2 Coatings for aluminum and aluminum alloys. Unless otherwise specified, all
aluminum and aluminum alloys, including clad aluminum alloy surfaces, shall be either anodized
to produce coatings conforming to MIL-A-8625 or shall receive a chemical conversion treatment
to produce coatings conforming to MIL-DTL-5541. Parts subject to wear, abrasion, erosion, and
severe corrosion conditions shall be anodized.
3.8.2.1 Anodic coatings. Anodic coatings are preferred for aluminum parts subject to wear,
abrasion, erosion, or severe corrosion conditions.
3.8.2.1.1 Anodic coatings for corrosion resistance. Parts anodized in accordance with
MIL-A-8625 Type I or II shall be sealed or post-treated with a corrosion-resistant finish
approved by the cognizant engineering organization. Hot water seal shall not be used unless
authorized by the cognizant engineering organization. Sealing processes can have a significant
effect on the adhesion of primers and polymer coatings. Parts that require painting or bonding
after anodization shall follow the sealing process specified in the contract or order.
3.8.2.1.2 Anodizing for wear resistance. Hard anodic coatings shall conform to
MIL-A-8625 Type III. Hard anodic coatings shall be used on parts where the functional purpose
is to provide a wear or abrasion resistant surface. It should be noted that hard anodic coatings
may have a detrimental effect on the fatigue life of aluminum alloys. Sealing of hard anodize
coatings for increased corrosion resistance may be authorized by the cognizant engineering
organization if there is no detrimental effect on hardness or wear.
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