MIL-DTL-5002E
3.4.2.3 Low-strength steels. Steels of Rockwell hardness less than C40 (180 ksi) shall be
cleaned using either mechanical means, alkaline or electrolytic alkaline descaling, molten salt
bath methods, acid pickling, or combinations thereof. Immersion times in the pickling bath shall
be kept at a minimum to prevent hydrogen absorption.
3.4.2.4 Corrosion and heat resistant steels. Corrosion and heat resistant steels having a
Rockwell hardness less than C40 (180 ksi) shall be cleaned by chemical or mechanical
processes, or combinations thereof as specified in 3.4.2.3. High strength corrosion and heat
resisting steels, Rockwell C40 (180 ksi) or greater, shall be cleaned as specified in 3.4.2.2. For
metals and alloys that are sensitive to contamination by gaseous constituents, such as hydrogen,
oxygen, and nitrogen, and are exposed to atmospheres containing such materials during
processing (e.g. heat treatment), sufficient metal shall be removed during manufacture to
eliminate the contaminated material. Verification of the complete elimination of contaminated
material shall be documented. If chemical cleaning methods are used to remove the impurities,
the cleaning shall not result in any attack of the surface, either pitting or intergranular. After
chemical cleaning, the surface shall be examined using a microscopic method at a magnification
that clearly establishes the absence of attack. Parts with pitted surfaces or showing signs of
intergranular attack shall be subject to rejection.
3.4.2.5 Magnesium and its alloys. Magnesium and its alloys shall be cleaned in accordance
with SAE AMS-M-3171, or by other processes approved by the cognizant engineering
organization.
3.4.2.6 Titanium and its alloys. For removal of contamination other than organic soil (see
3.4.1), titanium and its alloys shall be cleaned in accordance with ASTM B600.
3.4.3 Flux removal. Soldering, welding, and brazing fluxes shall be removed by the use of
hot water, soap and water, alcohol (TT-I-735), degreasing solvent (MIL-PRF-680), or other
methods that do not result in attack of the metal. Methyl alcohol shall not be used on magnesium
or titanium and their alloys. Acid or alkaline materials shall not be used, unless approved by the
cognizant engineering organization. The completeness of flux removal shall be determined in
accordance with the applicable welding, soldering, or brazing specification.
3.4.4. Use of abrasives. Abrasives used on any metal or alloy shall not have been used on
other metals or alloys unless they were used for a similar base metal (for example, aluminum
abrasives on aluminum alloys).
3.4.5 Rinsing. When either acid (pH<5) or alkaline (pH>8) materials are employed, the
cleaned parts shall be given a thorough rinse with water of a purity that removes all acid or alkali
prior to the coating operations, such that no residual contamination remains.
3.5. Methods of application. Metallic coatings shall be applied by electrodeposition,
vacuum deposition, mechanical deposition, metallic compound deposition, thermal spraying
methods, hot dip methods, or ion vapor deposition, in conformance to applicable specifications.
Metallic coatings may be applied by sputtering as specified and approved by the cognizant
engineering organization.
6
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business