1、Designation:F48309(Reapproved 2014)Standard Practice forTotal Immersion Corrosion Test for Aircraft MaintenanceChemicals1This standard is issued under the fixed designation F483;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the yea
2、r of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()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 practice covers the determinat
3、ion of the corrosive-ness of aircraft maintenance chemicals on aircraft metals withtime under conditions of total immersion by a combination ofweight change measurements and visual qualitative determina-tion of change.1.2 The values stated in SI units are to be regarded asstandard.The values in pare
4、ntheses are for information only.1.3 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 limitation
5、s prior to use.2.Referenced Documents2.1 ASTM Standards:2D235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D329 Specification for AcetoneD1193 Specification for Reagent WaterE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision
6、Liquids3.Significance and Use3.1 Many aircraft maintenance chemicals are used on com-ponents and structures which would be adversely affected byexcessive dimensional change.This practice screens thesechemicals to ensure compliance with specified weight changecriteria.4.Apparatus4.1 Wide-Mouth Sealab
7、le Glass Jar or Stoppered Flask ofSuitable SizeThe glass jar or flask should be so chosen so thatthe specimens will remain fully immersed in a vertical positionduring testing and the ratio of area of immersed metal tovolume of solution will be in accordance with 8.1.4.1.1 WarningSome aircraft mainte
8、nance chemicalswhen heated have high vapor pressures or may produce gasesduring testing.Suitable precautions should be taken to preventthe containing vessel from exploding or the vessel should be sochosen as to withstand the resulting pressure.4.2 Specimen-Supporting DeviceA glass or fluorocarbonpla
9、stic supporting system designed to keep the specimen fullyimmersed while ensuring free contact with the solution,anddesigned to isolate the specimens from each other physically.4.3 For materials containing low boiling point solvents,ameans of preventing evaporation losses shall be used.4.4 Constant-
10、Temperature DeviceAny suitable regulatedheating device(mantle,hot plate,or bath)may be used tomaintain the solution at the required temperature.4.5 Thermometer,having a range from 95 to 155C(203 to311F)and conforming to requirements for ThermometersS67C or S67F in accordance with Specification E2251
11、.4.6 Oven,low temperature explosion-proof,capable ofmaintaining 38 6 3C(100 6 5F)through 120 6 5C(248 65F).5.Reagents and Materials5.1 Acetoneconforming to Specification D329.5.2 Methyl n-Propyl Ketone(MPK).35.3 Mineral Spirits,Type IIconforming to SpecificationD235.1This practice is under the juris
12、diction of ASTM Committee F07 on Aerospaceand Aircraft and is the direct responsibility of Subcommittee F07.07 on Qualifica-tion Testing of Aircraft Cleaning Materials.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1977.Last previous edition approved in 2009 as F48
13、3 09.DOI:10.1520/F0483-09R14.2For 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.3The sole source of supply of Methyl
14、n-propyl ketone(MPK)known to thecommittee at this time is Eastman Chemical Company,Kingsport,TN,USA.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical com
15、mittee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Test Specimens6.1 Take test specimens of a given alloy from the same sheetstock,which shall be in new or like-new condition,andmeasure 50.8 by 25.4 by 1.6 mm(2
16、 by 1 by 0.06 in.)with a3.2-mm(0.125-in.)diameter mounting hole suitably located atone end of the specimen.Test three replicate specimens in eachconcentration of maintenance chemical solution in accordancewith 8.2.1.Take the total area of the specimen as 28.2 cm2(4.4in.2).6.1.1 Identify each panel with Numbers 1,2,3,or 4.7.Precleaning Test Specimens7.1 Immerse the test specimens in a beaker of mineralspirits,Type II,conforming to Specification D235 at roomtemperature and swab the surface of the
