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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 - 31 - 32 - 33 - 34 - 35 - 36 - 37 - 38 - 39 - 40 - 41 - 42 - 43 - 44 - 45 - 46 - 47 - 48 - 49 - 50 - 51 - 52 - 53 - 54 - 55 - 56 - 57 - 58 - 59 - 60 - 61 - 62 - 63 - 64 - 65

MIL-STD-171F

TA8LE VII. Surface treatments and finishes for aluminum. Finish No. Requirements

*	7.1	Anodic film, chromic-acid, MIL-A-8625, type I, ASTM 8580, type G, or
		ASTM D1730, type 2, method 2
	7.1.1	Class 1, nondyed
	7.1.2	Class 2, dyed, color to be specified
	7.1.3	Anodic film, chromic-acid, MIL-A-8625, type I8 (10W voltage process,
		20V)
*	7.2	Anodic film, sulfuric acid, MIL-A-8625, type II or ASTM D1730, type 2,
		method 1
	7.2.1	Class 1, nondyed
	7.2.2	Class 2, dyed, color to be specified
*	7.3	Chemical film, chromate, MIL-DTL-5541 or ASTM 8449
	7.3.1	Type II, Class 1A, for maximum protection against corrosion, painted
		or unpainted
	7.3.2	Discontinued: Use finish 7.3.1
	7.3.3	Class 3, for protection against corrosion where low electrical
		resistance is required
	7.4	Use finish 5.2, pretreatment coating
*	7.5	Hard anodic coating, MIL-A-8625, type III, or ASTM 8580, type A,
		thickness 0.002 ± 0.0002 inch
		(50.8 ± 5 μm) unless otherwise specified.
	7.5.1	Class 1, nondyed
	7.5.2	Class 2, dyed, color to be specified
	7.6 thru	Discontinued: use finish 7.5
	7.9

*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.

5.1.4.5 Magnesium alloys. Surfaces of magnesium alloys shall be cleaned by vapor- degreasing (finish 4.10), nonetching alkaline cleaner (finish 4.9) or as otherwise specified (e.g., non-metallic abrasive blasting). They shall then be given immediately one ------- of the treatments specified in Table VIII. Finish 8.1.2 is very corrosion resistant but is a hard, brittle coating and is subject to chipping, cracking or spalling, therefore is recommended only for rigid parts. The design/procuring activity shall select the finish and shall reference it on drawings, in contracts, or in item specifications by the numbers shown in the table. Finish 8.6 is used for touch-up applications or where dimensional tolerances must be maintained.

5.1.4.6 Copper and copper alloys. Surfaces of copper, brass, and bronze shall be cleaned by vapor-degreasing (finish 4.10), or as otherwise specified. Surfaces that are to be painted shall be treated with finish 3.2 or sandblasted (finish 4.1) just prior to being painted. The thickness of metal removed by blasting should not exceed 0.005 inch (130 μm). The design/procuring activity shall reference the amount on drawings. The design/procuring activity shall select the method of cleaning (unless cleaning is covered in the treatment specifications of table IX) and pretreatment coating and shall reference them on drawings, in contracts, or in item specifications by numbers shown in tables III, IV, VI and IX.