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Except for Type A (Hard Coat) used strictly for wear resistance, most anodized layers are porous upon formation. They must be sealed in hot water, steam, or chemical solutions to close the pores. ASTM B580 requires sealing tests (such as acid-dissolution or impedance tests) to ensure maximum corrosion resistance. 3. Abrasion Resistance
. It provides requirements for porous oxide coatings electrolytically formed on aluminum and aluminum alloy parts to improve appearance, corrosion resistance, and abrasion resistance. Scope and Classification The standard identifies seven specific types
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The ASTM B580 standard categorizes anodic coatings into based on their thickness, processing method, and intended environmental application. Coating Type Common Description Minimum Thickness Typical Application Type A 2.0 mils (50 µm) Extreme wear resistance, industrial gears, pistons Type B Architectural (Exterior) 0.7 mils (18 µm) Exterior building panels, window frames Type C Architectural (Interior) 0.4 mils (10 µm) Interior storefronts, trim, handrails Type D Decorative (Medium) 0.2 mils (5.0 µm) Consumer electronics, automotive trim Type E Decorative (Light) 0.1 mils (2.5 µm) Bright trim, indoor lighting reflectors Type F Flash Anodizing Less than 0.1 mils Pre-treatment for paint or temporary protection Type G Chromic Acid Anodizing 0.05 to 0.3 mils Aerospace components, fatigue-sensitive parts Key Technical Requirements of the Standard
ASTM B580-79 is important because it provides a standardized set of requirements for palladium-silver-copper alloy wire used in electrical contacts. This ensures that the wire meets certain performance and reliability standards, which is critical in electrical contact applications.
: Provides a balance of moderate corrosion resistance and high bright-dipped aesthetic clarity. Type E (General Interior / Decorative) They must be sealed in hot water, steam,
Here's some helpful content related to ASTM B580-79:
: Thickness can be measured using various methods, including eddy-current instruments ( ) or microscopical examination ( Availability and Status
Most anodized parts must be sealed in water or aqueous chemical solutions to improve corrosion and stain resistance, except when specifically excluded (like some Type A hard coats). Abrasion Resistance
Are you working with vitreous enamel coatings on metal substrates? You’ve likely come across ASTM B580-79 , the historical standard covering the "Test for Adherence of Porcelain Enamel Coatings to Sheet Metal."
of coatings, categorized by their application and performance requirements: ANSI Webstore