MIL-STD-171 Finishing Of Metal And Wood SurfacesThis standard establishes and updates general finish codes and serves as a general guide to the selection of suitable materials, procedures, and system for cleaning, plating, painting and otherwise finishing of metal and wood surfaces.

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MIL-STD-171F

5.1.3 Black oxide finishes. The basis metal shall be substantially free from flaws or defects that will be detrimental to the appearance or performance of the finish. The surface shall be cleaned and chemically finished as required by the detail specification, drawing or contract. The design/procuring activity shall select the desired finish from those shown in table III and shall reference it on drawings, in contracts or in item specifications by the number shown in the table.

TABLE III. Inorganic finishes, black oxide. Finish No. Requirements

General finish requirement headings shall not be specified. The specific finish numbers(s) only shall be specified. See page iii for the proper method of specifying finishes.

5.1.4 Metal treatments, other than metal deposition or black oxide.

5.1.4.1 Steel, noncorrosion-resistant. Prior to being painted, surfaces of noncorrosion- resistant steel (and iron) shall be cleaned and, unless otherwise specified, shall be pretreated. The cleaning shall leave the surface substantially free from oil, grease, dirt, scale, rust, and other foreign matter. Mechanical cleaning (finish 4.1) shall be used only where contamination from the process will not harm the surface being cleaned or any adjacent ones. The design/procuring activity shall select the method of cleaning from table IV (only if the pretreatment specification does not contain a cleaning requirement) and shall reference it on drawings, in contracts, or in item specifications by the number shown on the table. For porous castings see paragraph 4.3.1.