NPFC - MIL-C-83488
COATING, ALUMINUM, HIGH PURITY
|Publication Date:||1 May 1985|
This specification establishes the requirements for coating low alloy steel, stainless steel, aluminum alloy and titanium alloy parts with high purity aluminum (99 percent plus).
High Purity aluminum coatings shall be of the following classes, as specified (See 3.5 and 6.2):
Class 1 - 0.0010 inch thick (0.026 mm) (min)
Class 2 - 0.0005 inch thick (0.013 mm) (min)
Class 3 - 0.0003 inch thick (0.008 mm) (min).
High purity aluminum coatings shall be of the following types as specified (See 6.2):
Type I - as coated
Type II - with supplementary chromate treatment (See 3.4). Beneficial comments (recommendations, additions, deletions) and arty pertinent data which may be of use in improving this document should be addressed to: AFWAL/MLSE, Standardization Manager, WPAFB, OH 45433 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.
The high purity aluminum coatings covered by this specification are intended for use as corrosion protective coatings on ferrous and aluminum alloy parts. Coating may be applied by any process... View More
The high purity aluminum coatings covered by this specification are intended for use as corrosion protective coatings on ferrous and aluminum alloy parts. Coating may be applied by any process which produces a high purity (99 percent plus) aluminum coating. The process should not cause hydrogen embrittlement of the basis metal. Ion vapor deposited aluminum and aluminum electrodeposited using an organic electrolyte are processes which meet this criteria. It can also be applied to titanium and stainless steel alloys to provide corrosion compatibility with aluminum structure. Type II (Chromated per 3.4) high purity aluminum coating can also be used for applications which require an electrically conductive surface such as electrical bonding and grounding, and EMI compatibility.
Class 1 and Class 2 coatings are intended as general purpose coatings for corrosion protection of structural and functional ferrous and non-ferrous alloy components.
Class 3 coatings are intended as special purpose coatings where dissimilar metal compatibility is required for close tolerance or threaded parts (such as bushings, pins, fasteners, etc).View Less