ASTM_F_482_-_09_2014.pdf

Designation:F48209(Reapproved 2014)Standard Practice forCorrosion of Aircraft Metals by Total Immersion inMaintenance Chemicals1This standard is issued under the fixed designation F482;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the determination of the corrosive-ness of tank-type aircraft maintenance chemicals on aircraftmetals and the corrodibility of metals in these maintenancechemicals with time.The determination is made under condi-tions of total immersion by a combination of weight changemeasurements and visual qualitative determinations of change.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 limitations prior to use.For specificprecautions,see Section 6.2.Referenced Documents2.1 ASTM Standards:2D235 Specification for Mineral Spirits(Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D329 Specification for AcetoneD1193 Specification for Reagent WaterE1 Specification for ASTM Liquid-in-Glass Thermometers3.Significance and Use3.1 This practice not only provides information on theaccumulated effects of corrosion at specific time periods undera given set of conditions,but also provides information on theinitial rate of corrosion of virgin metal,the corrosion rate ofmetal per unit time after long exposure,and the initialcorrosion rate of virgin metal after long exposure of thecorroding fluid to metal.The test also provides a means ofdetermining the direction corrosion will take with time,al-though causes for increase or decrease in the corrosiveness andcorrodibility of media and metal(such as passive film forma-tion or destruction,depletion of corrosive contaminate,and soforth)as a function of time are not given.4.Apparatus4.1 Wide-Mouth Glass Jar or Flask of suitable sizes(3000to 4000 mL),capable of accommodating a reflux condenser,athermometer,and a specimen support system.Fig.1 shows atypical arrangement,but any array meeting the provisions of4.2 4.5 is acceptable.4.1.1 If agitation is required,use an apparatus capable ofaccepting a stirring mechanism,such as a magnetic stirrer orimpeller.Choose the glass jar or flask such that the specimenswill remain fully immersed in a vertical position during thetest,and the ratio of area of immersed metal to volume ofsolution will be in accordance with 9.1.4.2 Specimen-Supporting Devicea glass or fluorocarbonplastic supporting system designed to keep the specimen fullyimmersed while assuring free contact with the corrodingsolution,and designed to physically isolate the specimens fromeach other.4.3 Condensera glass reflux condenser of the water-cooled type,having a condenser jacket 200 to 300 mm inlength.4.4 Constant-Temperature DeviceUse any suitable regu-lated heating device(mantle,hot plate,or bath)to maintain thesolution at the required temperature.4.5 Thermometeran ASTM 75-mm(3-in.)immersionthermometer having a range from 18 to 150C(0 to 302F)and conforming to requirements for Thermometer 1F in accor-dance with Specification E1.1This practice is under the jurisdiction 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.Originallypublished in 1977.Last previous edition approved in 2009 as F482 09.DOI:10.1520/F0482-09R14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Reagents and Materials5.1 Mineral Spirits(Petroleum Spirits)(Hydrocarbon DryCleaning Solvent,conforming to Specification D235.5.2 Methyl n-propyl ketone(MPK).35.3 Acetone,conforming to Specification D329.5.4 Reagent Water,conforming to Specification D1193.6.Safety Precautions6.1 The solvents used in the cleaning of test specimens areflammable and harmful if inhaled.Keep away from sparks andopen flames.Avoid breathing vapors and prolonged or repeatedcontact with the skin.Use with adequate ventilation.6.2 Flammable solvents,acids,or alkalis,or other toxiccompounds are occasionally found in the material used foraircraft maintenance.Take suitable precautions to preventpersonnel injury.7.Test Specimens7.1 The test specimens of a given alloy sha