AIA/NAS 1192-2012 pdf download PERFORMANCE SPECIFICATION FOR HARD ANODIC COATINGS ON ALUMINUM ALLOYS
1 .0 SCOPE
1 .1 This specification defines the performance requirements for hard anodic coatings on aluminum and aluminum alloy parts. 2.0 APPLICABLE SPECIFICATIONS MIL-A-8625 Anodic Coatings for Aluminum and Aluminum Alloys FED-STD-1 51 Metals; Test Methods Copies can be obtained from the Department of Defense Single Stock Point (DODSSP). http://dodssp.daps.dla.mil
3.0 REQUIREMENTS
3.1 The hard anodic coating shall comply with MIL-A-8625, Type III and the following:
3.1 .1 Thickness. Unless otherwise specified on the engineering drawings, the thickness of the hard anodic coatings shall be .002 ± .0002 inches on all significant surfaces except (1) blind holes or recesses where the depth is greater than twice the diameter of the opening, and (2) surfaces of open holes which are deeper than seven times the diameter of the opening.
3.1.2 Corrosion Resistance. Hard anodic coatings shall show no evidence of corrosion after exposure to a salt spray test for a period of 240 hours when tested in accordance with 4.2.2.
3.1.3 Adhesion. Hard anodic coatings shall show no evidence of delamination, peeling, or flanking on the tension side when submitted to the bend test described in 4.2.3. Delamination or spalling on the compression side and crazing on the tension side shall not be cause for rejection.
3.1 .4 Workmanship. Hard anodic coatings shall be substantially smooth and uniform in thickness except in small holes, fillets, radii, and deep recesses. When observed visually with the aid of a 5X magnifying glass, surfaces shall be free from scratches, chips, breaks and burned areas. Damage to the base metal by handling shall not be cause for rejection unless it is of such severity as to cause discontinuities in the surface of the hard anodic film. The coatings shall be uniform in appearance and range in color from light amber or light grey to jet black (depending upon the alloy and the coating thickness), but shall not exhibit a chalky appearance. Small irregularities at points of electrical contact will be permitted.
4.0 QUALITY ASSURANCE PROVISIONS
4.1 Test Specimens and Panels
4.1 .1 Preparation. The test specimens or panels specified herein shall be of the same alloy and surface finish as the production work whenever possible. They shall be processed simultaneously with the production work, but in all instances the test specimen or panels shall have a coating thickness of .002 ± .0002 inches. The frequency of specimen preparation and test shall be as specified by the procuring activity.
4.2 Test Procedures
4.2.1 Coating Thickness. The thickness of hard anodic coatings shall be determined on representative parts or specimens per MIL-A-8625. When micrometer measurements are used, the results so obtained shall be calibrated against microscopic measurements on comparable specimens.
AIA/NAS 1192-2012 pdf download
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