阳极氧化铝汽车零件

[中文适用范围]： 汽车零件可由卷材、平板或挤压型材制成。合金的选择取决于光洁度要求、成型特性和机械性能。光亮阳极氧化合金 5657 和 52521 板材具有高光泽，最适合采用中间回火（例如 H25）形成的装饰。光亮阳极氧化合金 5457 用于需要高伸长率和完全退火（“0”）回火的零件。 6463合金是一种中等强度光亮阳极氧化挤压合金；合金 X7016 是一种高强度光亮阳极氧化挤压合金，主要适用于保险杠应用。为了满足某些装饰应用的防眩光要求，合金板 5205 和挤压合金 6063 能够提供所需的低光泽阳极氧化表面处理。 [外文原描述]： Automotive parts can be fabricated from either coiled sheet, flat sheet or extruded shapes. Alloy selection is governed by finish requirements, forming characteristics, and mechanical properties.Bright anodizing alloys 5657 and 5252 2x sheet provide a high luster and are preferred for trim which can be formed from an intermediate temper, such as H25. Bright anodizing alloy 5457 is used for parts which require high elongation and a fully annealed ("0") temper. Alloy 6463 is a medium strength bright anodizing extrusion alloy; Alloy X7016 is a high strength bright anodizing extrusion alloy primarily suited for bumper applications.To satisfy anti-glare requirements for certain trim applications, sheet alloy 5205 and extrusion alloy 6063 are capable of providing the desired low-gloss anodized finish.Bright anodizing alloys require control of the chemical composition of the alloy to enhance response to chemical brightening and to result in the formation of anodic coatings that are essentially transparent. Additionally, aluminum producers employ fabricating practices to minimize other metallurgical factors that adversely affect response to bright anodizing procedures. For non-heat-treatable alloys, a highly fragmented grain structure is preferred. Fully annealed, recrystallized grain structures are not optimum for bright anodizing. Where high elongations are required with intermediate tempers, fabricating practices are selected to minimize grain recrystallization.Another factor to be considered for trim application is the type of mill surface finish that is required. When the metal working treatments do not mar the mill produced surface appreciably, the smooth, bright rolled, "automotive trim" surface is desirable since it often eliminates the need for expensive mechanical buffing operations. Where trim fabricating procedures might be expected to damage a bright-rolled surface, duller mill finishes can be used and parts are buffed after forming. Bright rolled mill surfaces occasionally are protected with a removable tape or water soluble film.Selection of anodic coating required to protect aluminum parts is influenced by the required corrosion performance and appearance characteristics. Generally, anodic coatings 0.0003–0.0005 in (0.0076–0.0127 mm) thick are used for exterior trim application. Thinner anodic coatings 0.0001–0.0003 in (0.0025–0.0076 mm) are sufficient for interior trim components. Anodic coatings can be dyed to impart color, painted, or inlaid with vinyl or other plastics for aesthetic and/or functional purposes.The Aluminum Association's "Designation System for Finishes" is a recommended guide to assist in specifying anodic coatings for automotive trim.The American Society for Testing and Materials (ASTM) offers several test methods which are commonly used as the basis for many user specifications. These are:ASTM B110—Dielectric Strength of Anodically coated AluminumASTM B457—Measuring Impedance of Anodic Coatings of AluminumASTM B244—Measuring Thickness of Anodic Coatings on Aluminum with Eddy Current InstrumentsASTM B136—Resistance of Anodically Coated Aluminum to Staining by DyesASTM B137—Weight of Coating on Anodically Coated AluminumASTM B368—Copper-Accelerated Acetic Acid Salt Spray (Fog) Testing (CASS Test)ASTM B538—Fact (Ford Anodized Aluminum Corrosion Test) TestingASTM B580—Guide to the Specification of Anodic Oxide Coatings on AluminumASTM 429—Measurement and Calculation of Reflecting Characteristics of Metallic Surfaces Using Integrating Sphere InstrumentsASTM E430—Measurement of Gloss of High Gloss Metal Surfaces Using Abridged Goniophotometer or GoniophotometerCross Reference: ASTMB110,ASTMB136,ASTMB137,ASTMB244,ASTMB368,ASTMB429,ASTMB457,ASTMB538,ASTMB580,ASTME430