ASTM F483-2008 Standard Test Method for Total Immersion Corrosion Test for Aircraft Maintenance Chemicals.pdf

1、Designation: F 483 08Standard Test Method forTotal Immersion Corrosion Test for Aircraft MaintenanceChemicals1This standard is issued under the fixed designation F 483; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la

2、st 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 Department of Defense.1. Scope1.1 This test method covers the determinati

3、on of the corro-siveness of aircraft maintenance chemicals on aircraft metalswith time under conditions of total immersion by a combina-tion of weight change measurements and visual qualitativedetermination 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 limitat

5、ions prior to use.2. Referenced Documents2.1 ASTM Standards:2D 235 Specification for Mineral Spirits (Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D 329 Specification for AcetoneD 740 Specification for Methyl Ethyl KetoneD 1193 Specification for Reagent WaterE1 Specification for ASTM Liquid-i

6、n-Glass Thermometers3. Significance and Use3.1 Many aircraft maintenance chemicals are used on com-ponents and structures which would be adversely affected byexcessive dimensional change. This test method screens thesechemicals to ensure compliance with specified weight changecriteria.4. Apparatus4.

7、1 Wide-Mouth Sealable Glass Jar or Stoppered Flask ofSuitable SizeThe glass jar or flask should be so chosen sothat the specimens will remain fully immersed in a verticalposition during testing and the ratio of area of immersed metalto volume of solution will be in accordance with 8.1.4.1.1 WarningS

8、ome aircraft maintenance 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 glas

9、s or fluorocarbonplastic 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

10、 be used.4.4 Constant-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 18 to 150C (0 to302F) and conforming to requirements for Thermometer 1F inaccordance with Spe

11、cification E1.4.6 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 D 329.5.2 Methyl Ethyl Ketoneconforming to SpecificationD 740.5.3 Mineral Spirits, Type IIconforming to Specifi

12、cationD 235.6. 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 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 r

13、eplicate 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 4.1This test method is under the jurisdiction of ASTM Committee F07 onAerospace and Aircraft a

14、nd is the direct responsibility of Subcommittee F07.07 onQualification Testing of Aircraft Cleaning Materials.Current edition approved May 1, 2008. Published June 2008. Originallyapproved in 1977. Last previous edition approved in 2002 as F 483 98 (2002)1.2For referenced ASTM standards, visit the AS

15、TM 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unit

16、ed States.7. Precleaning Test Specimens7.1 Immerse the test specimens in a beaker of mineralspirits, Type II, conforming to Specification D 235 at roomtemperature and swab the surface of the individual specimenthoroughly using clean forceps to hold the test specimen andthe cotton swab.7.2 Shake off

17、excess solvent. Transfer and immerse the testspecimens separately several times in a beaker of methyln-propyl ketone.37.3 Shake off excess methyl n-propyl ketone and dry in avacuum desiccator or in a low-temperature oven at 120 6 5C(2486 5F) for 15 min. (If oven dried, remove to dessicatorand cool t

18、o ambient.)8. Conditioning8.1 Ratio of Area of Immersed Metal to Volume ofSolutionThe ratio of area of immersed metal to volume ofsolution shall be 8 mL per cm2. Use fresh solution for each setof replicates.8.2 Solution Concentration:8.2.1 Unless otherwise specified, test the specimens insolutions o

19、f the maintenance chemical in the concentratedas-received condition and at the recommended use dilutionusing water that conforms to Specification D 1193, Type IV. Incase the maintenance chemical is not soluble to the extentnoted, record this fact and continue with the test.8.2.2 If water is not used

20、 as the diluent, record the type andspecification of diluent used in the test.8.3 TemperatureUnless otherwise specified, the test tem-perature shall be 38 6 3C (100 6 5F).9. Procedure9.1 Weigh three of four specimens of the same alloy to thenearest 0.1 mg.9.2 Immerse three weighed specimens of each

21、alloy in thetest solution at the prescribed temperature. Place only speci-mens of the same alloy in the containing vessel. Maintain at therequired temperature for the prescribed exposure period. Re-tain the fourth specimen of each alloy for comparison pur-poses.9.3 At the end of 24 h, remove the tes

22、t specimens andproceed as follows:9.3.1 Rinse thoroughly under hot tap water, 49 to 60C (120to 140F) . Follow with a rinse in water conforming toSpecification D 1193, Type IV at room temperature.9.3.2 Rinse with a stream of acetone, conforming to Speci-fication D 329, from a wash bottle and oven dry

23、 at 120C(250F), dessicate until cooled to ambient, weigh and record.9.3.3 Then examine for and record on a form as illustratedin Appendix X1 in the 24-h column the following visiblechanges in comparison with the fourth virgin specimen of eachalloy.9.3.3.1 Discoloration and dulling,9.3.3.2 Etching,9.

24、3.3.3 Presence of accretions and relative amounts,9.3.3.4 Pitting, and9.3.3.5 Presence of selective or localized attack.9.4 Immerse the panels in the same test solution for a further144 h, then repeat 9.3.1-9.3.3.5.9.5 Reweigh specimens to nearest 0.1 mg, calculate weightloss or gain, and record in

25、168-h column.10. Report10.1 Report the data for each test performed on a form asillustrated in Appendix X1.11. Precision and Bias11.1 No statement is made about either precision or bias ofthis test method for measuring the immersion corrosion behav-ior of maintenance chemicals.Aerospace industry and

26、 multilo-cation laboratory use and acceptance of this test methodindicates a high degree of repeatability.12. Keywords12.1 in concentrate; in use dilution; maintenance chemicals;temperature control; time control; total immersion corrosion;visual corrosive deterioration; weight change criteriaAPPENDI

27、XX1. RECOMMENDED REPORT FORMX1.1 Report test results on a form as illustrated in Fig.X1.1.3Methyl n-propyl ketone, 90% purity or better.F483082FIG. X1.1 Report FormF483083ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedi

28、n this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and mu

29、st be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of th

30、eresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F483084