ASTM_D_6899_-_03.pdf

Designation:D 6899 03Standard Guide forLaboratory Cyclic Corrosion Testing of Automotive PaintedSteel1This standard is issued under the fixed designation D 6899;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide is designed to assist in determining theappropriate corrosion test methods for automotive paintedsteel.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.2.Referenced Documents2.1 ASTM Standards:B 117 Practice for Operating Salt Spray(Fog)Apparatus2D 16 Terminology for Paint,Related Coatings,Materialsand Applications3D 609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating Products3D 823 Practices for Producing Films of Uniform Thicknessof Paint,Varnish,and Related Products on Test Panels3D 870 Practice for Testing Water Resistance of CoatingsUsing Water Immersion3D 1193 Specification for Reagent Water4D 1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive Environments3D 1735 Practice for Testing Water Resistance of CoatingsUsing Water Fog Apparatus3D 2247 Practice for Testing Water Resistance of Coatings in100%Relative Humidity3D 3170 Test Method for Chipping Resistance of Coatings5D 6675 Practice for Salt-Accelerated Outdoor CosmeticCorrosion Testing of Organic Coatings on AutomotiveSheet Steel3G 1 Practice for Preparing,Cleaning and Evaluating Corro-sion Test Specimens6G 15 Terminology Relating to Corrosion and CorrosionTesting6G 16 Guide forApplying Statistics toAnalysis of CorrosionData6G 113 Terminology Relating to Natural and ArtificialWeathering Tests of Non-Metallic Materials7NOTE1Practice D 6675 describes an outdoor accelerated cosmeticcorrosion test that uses periodic application of an electrolyte solution tomaterials exposed at 45 degrees to the horizontal and facing the equator.2.2SAE Publications:SAE J1563 Guidelines for Laboratory Cyclic CorrosionTest Procedures for Painted Automotive Parts8SAE J2334 Cosmetic Corrosion Lab Test82.3Other Standards:GM 9540P General Motors Accelerated Corrosion TestJASO M610 Cosmetic Corrosion Test Method for Automo-tive PartsJIS Z 2371 Methods of Neutral Salt Spray Testing3.Terminology3.1 DefinitionsFor definition of terms used in this stan-dard,refer to Terminologies D 16,G 15,and G 113.4.Significance and Use4.1 When a laboratory-accelerated test simulates the chang-ing conditions to which automotive finishes are exposed,morerealistic corrosion failures are produced.4.2 Cyclic corrosion tests are effective for evaluating avariety of corrosion mechanisms,such as general,galvanic,crevice,etc.The cyclic corrosion tests make use of many typesof environments,such as salt fog(Practice B 117),humidity(Practice D 2247 or Practice D 1735)and dry conditions to1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.27 on Accelerated Testing.Current edition approved July 10,2003.Published August 2003.2Annual Book of ASTM Standards,Vol 03.07.3Annual Book of ASTM Standards,Vol 06.01.4Annual Book of ASTM Standards,Vol 11.01.5Annual Book of ASTM Standards,Vol 06.02.6Annual Book of ASTM Standards,Vol 03.02.7Annual Book of ASTM Standards,Vol 14.04.8Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.accelerate metallic corrosion.In cyclic corrosion testing,speci-mens can be exposed to many different types of environmentalconditions and cycled from one environment to another.4.3 In all tests it is imperative to expose control specimenswith an established corrosion performance together with thetest specimens to make a comparison possible of the corrosionperformance of the two sets.4.4 Guidelines are included for those who evaluate thecorrosion performance of painted metal parts in cyclic corro-sion tests.These guidelines are intended to help ensure that theresults of the tests can be used to reach conclusions concerningthe variables under study,without being affected by the testprocedure itself.The guidelines are also intended to assist usersof this type of test in obtaining good inter-laboratory agreementof results.4.5 This guide is not intended to be a substitute for thedescribed cyclic corrosion test standard.In all cases,thelaboratory should obtain the most recent published standard forcomplete details.The published standa