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MIL-STD-171 is the military standard that established the minimum requirements for finishing, and otherwise treating, metal and wood surfaces, and to serve as a general guide to the selection of suitable finishing materials, procedures, and systems.

As the standard pertains to aluminum parts and finishes:

 

  • MIL-STD-171, 7.2.1 calls out Anodic film on aluminum, sulfuric acid, MIL-A-8625*, Type II Class 1, non dyed

  • MIL-STD-171, 7.2.2 calls out Anodic film on aluminum, sulfuric acid, MIL-A-8625,* Type II Class 2, dyed, color to be specified

  • MIL-STD-171, 7.3.1 calls out Chemical film, chromate, MIL-C-5541 Class 1A, for maximum protection against corrosion, painted or unpainted

  • MIL-STD-171, 7.3.3 calls out Chemical film, chromate, MIL-C-5541 Class 3, for protection against corrosion where low electrical resistance is required

  • MIL-STD-171, 7.5.1 calls out Hard anodic coating on aluminum, MIL-A-8625*, Type III, Class 1 - thickness 0.002” ± 0.0002” unless otherwise specified, non dyed

  • MIL-STD-171, 7.5.2 calls out Hard anodic coating on aluminum, MIL-A-8625*, Type III, Class 2 - thickness 0.002” ± 0.0002” unless otherwise specified, dyed, color to be specified.

 

Hardcoat Anodize – Natural and Colors

MIL-A-8625, Type III, Class1     AMS 2468
MIL-A-8625, Type III, Class2     AMS 2469
AMS-A-8625, Type III, Class1     BAC 5821
AMS-A-8625, Type III, Class2     PS 13208
MIL-STD 171, 7.5.1      PS 13201
MIL-STD 171, 7.5.2      PS 13201.1
HP 4-79

Hardcoat Anodize w/Teflon

MIL-A-63576, Type I
AMS 2482

Sulfuric Anodize - Clear and Colors

MIL-A-8625 Type II, Class 1      AMS 2471
MIL-A-8625 Type II, Class 2     AMS 2472
AMS-A-8625, Type II, Class1      DPS-11.05
AMS-A-8625, Type II, Class2      DPS-11.06
MIL-STD-171, 7.2.1
MIL-STD-171, 7.2.2

Clear and Color Anodizing to Aluminum Association (AA) & American Architectural Manufacturers Association (AAMA) finish designations

Chemical Conversion Coating (Alodine, Iridite, Chem Film)

MIL-DTL-5541F
MIL-STD-171
AMS 2473
AMS 2474
 

GENERAL SPECIFICATION DEFINITIONS FOR ALUMINUM ANODIZING:

Type II = Sulfuric Acid Anodize
Type III = Sulfuric Acid Hardcoat Anodize
Class 1 = Non-dyed Coatings
Class 2 = Dyed Coatings (color to be specified)

Mil-A-8625

Type II - Classes 1 & 2
Type III - Classes 1 & 2

AMS-2471

Type II - Class 1 & 2
AMS-2472
Type II - Class 2 - Dyed
AMS-246
Type III - Hardcoat Anodize
Mil-Std-17
7.2.1 - Type II - Class 1 - Non-Dyed
7.2.2 - Type II - Class 2 - Dyed
7.2.1 - Type III - Class 1 - Non-Dyed
7.2.1 - Type III - Class 2
- Dyed
Mil-F-14072
Code 511 - Type II & III
Code 514 - Type III
ASTM B 580-79 Mil-Std-18
Code 202 - Type II - Class 1 - Non-Dyed
Code 203 - Type II - Class 2 - Dyed
Code 204 - Type III - Class 2 - Dyed
Code 207 - Type III - Class 1
- Non-Dyed

TITANIUM ANODIZING

AMS-2488 - Type II Coating