MIL-DTL-5002E
3.8.2.2 Conversion coatings.
3.8.2.2.1 Aircraft applications. All non-clad aluminum and aluminum alloys used in
locations classified as exterior aircraft surfaces by MIL-STD-7179 shall be conversion coated to
produce coatings conforming to MIL-DTL-5541 Class 1A.
3.8.2.2.2 Electrical applications. Chemical films conforming to MIL-DTL-5541 Class 3
shall be used on electrical parts where low electrical contact resistance is required. Other surface
treatments for low electrical resistance and corrosion protection may be used when approved by
the cognizant engineering organization.
3.8.3 Coatings for magnesium and magnesium alloys.
3.8.3.1 Anodic coatings. All magnesium alloys shall be anodized in accordance with
ASTM D1732 Type I, Class A or Class C, or Type II, Class A or Class D. Parts, subsequent to
anodizing, shall be sealed in accordance with SAE AMS-M-3171 Type VII. Anodized
magnesium surfaces may be stripped and re-anodized when approved by the cognizant
engineering organization.
3.8.3.2 Conversion coating. SAE AMS-M-3171 treatments shall only be used for
temporary protection or touch-up of damaged anodic coatings. All surfaces that have the anodic
or chemical film removed or damaged shall be touched up using the SAE AMS-M-3171 Type I
or Type VI process.
3.8.4 Coatings for ferrous metals
3.8.4.1 Phosphate coatings. When approved by the cognizant engineering organization,
phosphate treatments may be used on surfaces where it is impractical to apply an adequate
corrosion control coating or where a corrosion control coating will interfere with the part's
function. When approved for use on steel parts, phosphate treatments shall be in accordance
with MIL-DTL-16232 or TT-C-490 Type I or II. Unless otherwise specified by the cognizant
engineering organization, all phosphate coatings shall be post-treated with a rinse, such as
chromate.
3.8.4.2 Black oxide. When approved by the cognizant engineering organization, black oxide
coatings may be applied to ferrous metals. Black oxide coatings shall be applied in accordance
with MIL-DTL-13924.
3.8.5 Surface treatments for corrosion and heat-resistant steel alloys. Unplated corrosion-
resistant and heat-resistant steel alloys shall be finished as specified by the cognizant engineering
organization.
3.8.6 Passivation treatment for Ferrous Alloys. Stainless steels (200, 300, 400 series) and
precipitation-hardened corrosion resistant steels shall undergo passivation in accordance with
ASTM A967 (stainless steels) or SAE AMS2700 (corrosion resistant steels), or by other methods
approved by the cognizant engineering organization. Passivation shall be followed by a
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