MIL-STD-171F
FOREWORD
The purpose of this standard is to establish finish system codes which link or cross reference specific specification information for finishing and otherwise treating metal and wood surfaces. It also serves as a general guide to the selection of suitable finishing materials, procedures, and systems. It covers both organic (paint, varnish, and the like) and inorganic (metal plating, phosphatized metal, and the like) coatings. Specialized systems particular to individual agencies are covered by drawings, specifications and standards published by those organizations and supplement this standard. Such procurement documents should make direct reference to the applicable specification. For example, MIL-STD-186 covers painting and other
finishing of Army Missile weapon systems. Finish system code numbers in the tables shall not be changed in future revisions of this standard, in as much as those code numbers should be referenced on drawings, in contracts and in end items specifications. Where a system in a
previous edition of MIL-STD-171 has been deleted from the revision, the system to be used as a
substitute is noted in the tables.
For convenience in referencing, all procedures, whether they merely clean a surface, deposit a film, or perform some other desirable function, are cataloged as "finishes".
As an example of how to use this standard, assume a part is to be finished with chromated zinc plate 0.001 inch (25 μm) thick. Turning to table II, Inorganic Finishes, Plating, we find the designation for this finish to be 1.9.2.1. Hence, the instructions on the drawing would be:
Finish 1.9.2.1 of MIL-STD-171.
In this particular case, it is unnecessary to mention any preliminary steps such as cleaning, because ASTM 8633, Coatings of Zinc of Iron and Steel Zinc Plating Electrodeposited referenced in finish 1.9.2.1, provides for this step in these words "It (the basis metal) shall be subjected to such cleaning, pickling, and plating procedures as are necessary to yield deposits as here in after specified".
Again, assume a 155 mm projectile body is to be finished with olive drab lusterless enamel. According to table XIII, this finish is system 20.2. Assume the preparation for painting to be phosphating (finish 5.1.1). The finishing coat would be a phosphate coating plus an enamel conforming to MIL-DTL-11195. Hence the instructions on the drawing would be:
Finish 5.1.1 plus 20.1 of MIL-STD-171, Olive Drab No. 34088 per FED-STD-595.
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