1、Designation: F 483 09Standard Practice 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 last
2、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 practice covers the determination of
3、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 parenthese
4、s 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 limitations p
5、rior 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 1193 Specification for Reagent WaterE 2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precisi
6、on 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
7、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 WarningSome aircraft
8、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 glass or fluoroca
9、rbonplastic 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
10、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 95 to 155C (203 to311F) and conforming to requirements for ThermometersS67C or S67F in accordance with Spe
11、cification E 2251.4.6 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 n-Propyl Ketone (MPK)3.5.3 Mineral Spirits, Type IIconforming to SpecificationD 235.6. Tes
12、t 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 replicate specimens
13、 in each1This 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 May 15, 2009. Published June 2009. Originallyapproved in 1977. Las
14、t previous edition approved in 2008 as F 483 08.2For 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 sou
15、rce of supply of Methyl 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
16、of the responsible technical committee,1which you may attend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.concentration of maintenance chemical solution in accordancewith 8.2.1. Take the total area of the specimen as 28.2 cm2(4.4i
17、n.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 D 235 at roomtemperature and swab the surface of the individual specimenthoroughly using clean forceps to hold the
18、 test specimen andthe cotton swab.7.2 Shake off excess solvent. Transfer and immerse the testspecimens separately several times in a beaker of methyln-propyl ketone.7.3 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.
19、 (If oven dried, remove to dessicatorand cool to 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 otherw
20、ise specified, test the specimens insolutions of 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 co
21、ntinue with the test.8.2.2 If water is not used 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
22、mg.9.2 Immerse three weighed specimens of each 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 p
23、ur-poses.9.3 At the end of 24 h, remove the test 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-
24、fication D 329, from a wash bottle and oven dry 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
25、.1 Discoloration and dulling,9.3.3.2 Etching,9.3.3.3 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 m
26、g, calculate weightloss or gain, and record in 168-h column.10. Report10.1 Report the data for each test performed on a form asillustrated in Appendix X1.11. Keywords11.1 in concentrate; in use dilution; maintenance chemicals;temperature control; time control; total immersion corrosion;visual corros
27、ive deterioration; weight change criteriaAPPENDIXX1. RECOMMENDED REPORT FORMX1.1 Report test results on a form as illustrated in Fig.X1.1.F483092FIG. X1.1 Report FormF483093ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentione
28、din 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
29、must 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
30、theresponsible 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).F483094
