ASTM_F_1110_-_09_2014.pdf

Designation:F111009(Reapproved 2014)Standard Test Method forSandwich Corrosion Test1This standard is issued under the fixed designation F1110;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()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method defines the procedure for evaluatingthe corrosivity of aircraft maintenance chemicals,when presentbetween faying surfaces(sandwich)of aluminum alloys com-monly used for aircraft structures.This test method is intendedto be used in the qualification and approval of compoundsemployed in aircraft maintenance operations.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for information.1.3 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.Specific hazard statements appear in Section 9.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1748 Test Method for Rust Protection by Metal Preserva-tives in the Humidity CabinetG46 Guide for Examination and Evaluation of Pitting Cor-rosion2.2 Industry Standards:3SAE-AMS-QQ-A-250/4 Al Alloy 2024,Plate and SheetSAE-AMS-QQ-A-250/5 Al Alloy Alclad 2024,Plate andSheetSAE-AMS-QQ-A-250/12 Al Alloy 7075,Plate and SheetSAE-AMS-QQ-A-250/13 Al Alloy Alclad 7075,Plate andSheet2.3 Military Specification:MIL-A-8625 Anodic Coatings forAluminum andAlAlloys43.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 sandwich corrosion testa comparative acceleratedenvironmental test of the corrosivity of liquid or solid materialspresent between faying surfaces of structural aluminum alloyscommonly used in aerospace construction.4.Summary of Test Method4.1 Aluminum coupons having clad or anodized noncladsurfaces are sandwiched together with a filter paper saturatedwith the test material between the coupons.The sandwichedcoupons are cycled between warm ambient air and warmhumid air for 7 days.The coupons are then inspected todetermine whether corrosion more severe than that caused byreagent water has occurred on the surfaces exposed to the testmaterial.This test method is used for solutions of dry granularmaterial or for liquid materials.5.Significance and Use5.1 The data generated by this test method shall be used todetermine whether aircraft structural aluminum alloys areliable to be corroded or damaged by application of the testmaterial during routine maintenance operations.5.2 Interpretation of the sandwich corrosion test results isbased on a comparison of the appearance of faying surfaces ofthree sets of coupons.One set of test coupons is exposed withreagent water only in the faying surfaces,to establish thebaseline(controls)against which the panels exposed to the testmaterial are compared.Disregard corrosion at cut edges of thetest coupons.5.3 The relative corrosion severity rating system is providedin order to allow a numerical classification of the test resultsand to eliminate the necessity for elaborate weight lossmeasurements.Pitting corrosion,which is rated 4extensive(severe)corrosion,may involve only a negligible weight loss.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft and is the direct responsibility of Subcommittee F07.07 onQualification Testing of Aircraft Cleaning Materials.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1986.Last previous edition approved in 2009 as F1110 09.DOI:10.1520/F1110-09R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001.4Available from Department of Defense Single Stock Point(DODSSP);http:/dodssp.daps.dla.milCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.4 Relative corrosion severity rating system:Appearance/Corrosion:0No visible corrosion and no discoloration present1Very slight corrosion or very slight discoloration,and/or up to 5%of areaAcorroded2Discoloration and/or up to 10%of areaAcorroded3Discoloration and/or up to 25%of areaAcorroded4Discoloration and/or more than 25%of areaAcorroded,and/or pittingpresentA”Area”refers to area under the filter paper,or if no filter paper is used,the areawhere the test m