MIL-A-8625F-TYPE I&II

MILITARY SPECIFICATION

ANODIC COATINGS FOR ALUMINUM AND ALUMINUM ALLOYS

This specification is approved for use by all Departments and Agencies of the Department

of Defense.

1. SCOPE

1.1 Scope. This specification covers the requirements for six types and

two classes of electrolytically formed anodic coatings on aluminum and

aluminum alloys for non-architectural applications (see 6.1). ~

1.2 Classification. The anodic coating Types and Classes covered by this

specification are as specified herein (see 6.2 and 6.21):

1.2.1 Types

TYPE I

--Chromic acid anodizing, conventional coatings produced from chromic acid

bath (see 3.4.1)

TYPE II --Sulfuric acid anodizing, conventional coatings produced from sulfuric acid bath

(see 3.4.2)

3.4.1 Type

I, IB,

and IC coatinqs. Type I and

IB

coatings shall be the

result of treating aluminum and aluminum alloys electrolytically in a bath

containing chromic acid to produce a uniform anodic coating on the metal

surface. Type IC coatings shall be the result of treating aluminum and

aluminum alloys electrolytically in a bath containing mineral or mixed

mineral/organic acids (non-chromic acid) to produce a uniform anodic coating

on the metal surface. Unless otherwise specified in”the contract, purchase

order or applicable drawing, Type I coatings shall not be applied to aluminum

alloys with a nominal copper content in excess of 5.0 percent; nominal silicon

contents in excess of 7.0 percent; or when the total allowable contents of

nominal alloying elements exceed 7.5 percent. Heat treatable alloys which are

to receive a Type

I, IB,

or IC coating shall be in the required temper

obtained by heat treatment, such as -T4, -T6, or T73, prior to anodizing.

3.4.2

Type II and 116

coatlnqs. Type II and

116

coatings shall be the

result of treating aluminum and aluminum alloys electrolytically in a bath

containing sulfuric acid to produce a uniform-anodic coating on-the metal

surface. Heat treatable alloys shall be in the required temper obtained by

heat treatment, such as -T4, -T6,or T73, prior to anodizing.

Class 1

-Non-dyed (see 3.5.)

Beneficial comments (recommendations, additions, deletions) and any

pertinent data which may be of use tn improving this document should be

addressed to: commanding Officer, Naval Air Warfare Center Aircraft

Oivtslon Lakehurst, Code SR3, Lakehurst, NJ 08733-5100, by using the

self-addressed Standardization Document Improvement Proposal (DD Form 1426)

appearing at the end of this document or by letter.

3.5 Class 1. When class 1 is specified in the contract or purchase order

(see 6.2), the anodic coating shall not be dyed or pigmented. Any natural

coloration resulting from anodic treatment with the various alloy compositions

shall not be considered coloration. The characteristic color Imparted by the

sealing process shall also be considered as non-dyed.

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number and date of this specification.

b. Type of anodic coating (see 1.2.11).

c. Class of anodic coatinq (see 1.2.21).

d. Special process operatinq conditions, if applicable ( see 3.2).

e. Special cleaning and fabrication requirements (see 3.3.1, 3.3.2,and 3.3.3).

f.

If

coating weight for Type IC can exceed the maximum specified inTable I.

g. Color and uniformity of Class 2 coatings, if applicable (see 3.6.1 and 3.12}.

h. Degree of non- uniformity of dyed casting alloys (see 3.6.1.1).

i. Light fastness resistance, if applicable, and a Delta E value if different than 3 (see

3.7.1.3).

j. Type

III

coating thickness, if applicable (see 3.7.2.1).

k. Coating weight for thickness, Type

III, if substituted (see 3.7.2.1.1).

l.

Special sealing requirements (see 3.8).

m. When applicable, the allowable difference in anodic coating appearance resulting from

inherent base metal differences (see 3.13).

n. Provide the specific location of contact marks if important to the function of the part (see

3.13.1 and 6.14).

o. Acceptance criteria for quality conformance inspections (see 4.4.2 and 6.20).

P.

If

paint adhesion testing is required for quality conformance testing (see 4.4) and the

required paint system (if different than that in 4.4.3.1).

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