ASTM B580-2019 pdf free download

ASTM B580-2019 pdf free download.Standard Specification for Anodic Oxide Coatings on Aluminum
1. Scope
1.1 This specification covers requirements for electrolyti- cally formed porous oxide coatings on aluminum and alumi- num alloy parts in which appearance, abrasion resistance, electrical properties, and protection against corrosion are important. Nonporous, barrier layer anodic coatings used for electrical capacitors are not covered. Seven types ofcoatings as shown in Table 1 are provided. Definitions and typical ex- amples of service conditions are provided in Appendix X1. N OTE 1—It is recognized that uses exist in which modifications of the coatings covered by this specification may be required. In such cases the particular properties desired by the purchaser should be the subject of agreement between the purchaser and the manufacturer. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Manufacture
3.1 Defects in the surface of the basis metal, such as scratches, porosity, inclusions, roll and die marks, cold shuts, and cracks, will adversely affect the appearance and perfor- mance of applied coatings despite the observance of best anodizing practices. Accordingly, defects in the coating that result from such conditions shall not be cause for rejection. N OTE 2—To minimize problems ofthis sort, the specifications covering the basis material or the item to be anodized should contain appropriate 3.2 The basis metal shall be subjected to such mechanical finishing operations, cleaning, and chemical or electrolytic pre-treatments as are necessary to yield anodic coatings with the final quality and appearance specified by the purchaser. 3.3 Except where specifically excluded, anodized parts shall be sealed in water or aqueous chemical solutions of such purity, composition, pH, and temperature, as to impart the properties specified herein.
4. Significant Surfaces
4.1 Significant surfaces are defined as those normally vis- ible (directly or by reflection) which are essential to the appearance of serviceability of the article when assembled in normal position; or those surfaces which can be the source of corrosion products that will deface visible surfaces and inter- fere with functional surfaces on the assembled article. When necessary, the significant surfaces shall be the subject of agreement between purchaser and manufacturer and shall be indicated on the drawings of the parts, or by the provision of suitably marked samples. N OTE 3—When significant surfaces are involved on which the specified thickness or density of the coating cannot readily be controlled, such as threads, holes, deep recesses, and similar areas, the purchaser and the manufacturer should recognize the necessity for either thicker films on the more accessible surfaces or for special racking.
5. Manner of Specifying Requirements
5.1 Coating Description—When ordering articles to be finished in accordance with this specification, the purchaser shall state: 5.1.1 The ASTM designation number, 5.1.2 The coating type and description (see Table 1), 5.1.3 The minimum anodic film thickness, 5.1.4 Special post anodic treatments, 5.1.5 Applicable quality assurance requirements (see Sec- tion 6), 5.1.6 Significant surface appearance requirements such as color, texture, or reflectivity, and 5.1.7 The alloy to which the coating is to be applied. 5.2 Supplementary Coating—Any supplementary coating that is required in addition to normal or special sealing must either be described in detail along with its requirements or the appropriate specification(s) must be referenced.
6. Quality Assurance
6.1 Anodic oxide coatings can be produced to have many different characteristics. No single coating can be expected to have all of these characteristics. Therefore, the quality assur- ance requirements for a given coating should be selected to control those properties necessary to the expected end use for the product. 6.2 Anodic coatings supplied under this specification shall meet the minimum requirements for film thickness as stated in Table 1. 6.3 The following ASTM test methods are applicable to anodic coatings within the scope of this specification: B110, B117, B136, B137, B244, B368, B457, B487, B538, D658, E429, and E430. The selection of tests to be required and the level of performance against each test, with the exception of minimum film thickness, shall be subject to agreement between purchaser and manufacturer. The Dye Stain Test, as described in Test Method B136, shall not be required for Type G coatings or for Types B through F coatings sealed only in dichromate solutions, or for unsealed Type A coatings.