1、Designation: F 2111 01a (Reapproved 2005)e1Standard Practice forMeasuring Intergranular Attack or End Grain Pitting onMetals Caused by Aircraft Chemical Processes1This standard is issued under the fixed designation F 2111; the number immediately following the designation indicates the year oforigina
2、l adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEEditorial changes were made throughout in September 2005.1. Scope1.1 Th
3、is practice covers the procedures for testing andmeasuring intergranular attack (IGA) and end grain pitting onaircraft metals and alloys caused by maintenance or productionchemicals.1.2 The standard does not purport to address all qualifica-tion testing parameters, methods, critical testing, or crit
4、eria foraircraft production or maintenance chemical qualifications.Specific requirements and acceptance testing along with asso-ciated acceptance criteria shall be found where applicable inprocurement specifications, materials specifications, appropri-ate process specifications, or previously agreed
5、 upon specifi-cations.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 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 sta
6、ndard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E3 Practice for Preparation of Metallographic SpecimensG1 Practice for Preparing, Cleaning, and Evaluating Cor-rosion Test Sp
7、ecimensG15 Terminology Relating to Corrosion and CorrosionTestingG46 Guide for Examination and Evaluation of PittingCorrosion2.2 ASME Standard:B46.1 Surface Texture (Surface Roughness, Waviness, andLay)33. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 longitudinal grain directi
8、on (L)the dimension par-allel to the rolling or extruded direction of the extrusion in theoriginal shape.3.1.2 long transverse (LT)the longest dimension perpen-dicular to the rolling or extruded direction of the extrusion inthe original shape.3.1.3 pita depression or cavity with a width to depth rat
9、ioof 6 to 1.3.1.4 short transverse (ST)the shortest dimension perpen-dicular to the rolling or extruded direction of the extrusion inthe original shape.3.1.5 surface roughness (Ra)filtered mean line in. (m)as defined in ASME B46.1, Surface Texture.4. Significance and Use4.1 If not properly qualified
10、, chemicals and chemical pro-cesses can attack metals used during aircraft maintenance andproduction. It is important to qualify only processes andchemical formulas that do not have any deleterious effects onaircraft metallic skins, fittings, components, and structures.This test procedure is used to
11、 detect and measure intergranularattack or pitting depth caused by aircraft maintenance chemicalprocesses, hence, this test procedure is useful in selecting aprocess that will not cause intergranular attack or end grainpitting on aircraft alloys.4.2 The purpose of this practice is to aid in the qual
12、ificationor process conformance testing or production of maintenancechemicals for use on aircraft.4.2.1 Actual aircraft processes in the production environ-ment shall give the most representative results; however, thetest results cannot be completely evaluated with respect to1This practice is under
13、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 Sept. 1, 2005. Published September 2005. Originallyapproved in 2001. Last previous edition approve
14、d in 2001 as F 2111 01a.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 American Society of M
15、echanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ambient conditions which normally vary from day to day.Additionally, when testing ch
16、emicals requiring dilutions, waterquality and composition can play a role in the corrosion ratesand mechanism affecting the results.4.2.2 Some examples of maintenance and productionchemicals include: organic solvents, paint strippers, cleaners,deoxidizers, water-based or semi-aqueous cleaners, or et
17、chingsolutions and chemical milling solutions.5. Apparatus and Materials5.1 Metallurgical Microscope, capable of 5003 or greatermagnification with scaled filar units in microscope eyepiece.5.2 Metallurgical Polishing Wheel, capable of polishing testspecimen to a surface finish of 5-in. Raor finer.5.
18、3 Noncorrosive Metallurgical Quality Polishing Media orCompound, capable of polishing test specimens to 5-in. Raorfiner.6. Test Specimens6.1 Unless otherwise specified, manufacture test specimensas follows:6.1.1 Prepare at least one test specimen (or more whenspecified by applicable process specific
19、ation) from plate, sheet,extrusion, or hand forging as illustrated in Fig. 1.6.1.2 Cut out metallurgical test specimen and polish Face Ato 0.812 m (32 in.) Raor preferably finer with polish as givenin 5.3.7. Procedure7.1 Expose entire polished specimen through normal pro-duction or maintenance cycle
20、. Use test temperatures andperiods of time representative of the highest usage temperatureand longest exposure times associated with the chemicalprocess. For conformance testing, process specimens withrepresentative-like alloy parts through all operations includingprecleaning, post rinsing, and so f
21、orth, for the time necessary toremove the amount of metal specified by process or to achieveprocess specified cleanliness.7.2 For chemicals normally used at room temperature forperiods of less than 8 h, use 40.6 6 1C (105 6 1.8F) for anexposure time of 24 h.7.2.1 A range of conditions shall be used
22、over which theprocess is expected to operate. For example, if the process willbe used from 10 to 37.8C (50 to 100F), data points shall begenerated from 10 to 37.8C (50 to 100F) for completeness.7.3 If required, clean specimen by removing corrosionproducts in accordance with Practice G1. An ideal pro
23、cedureshould remove only corrosion products and not result in theremoval of any base metal.7.4 After exposing the test specimens to the required timesand temperatures, clean and mount metallurgical test specimenas illustrated in Fig. 2 in accordance with Practice E3.7.5 After mounting, metallurgical
24、 polish to a surface rough-ness of 0.127-m (5-in.) Raor finer.7.6 Metallurgical Evaluation of Polished Test Specimens:7.6.1 Unless otherwise specified, observe the entire surfaceof Face A of the test specimen under 100 to 5003 magnifica-tion for end grain pitting and intergranular attack.7.6.1.1 Mea
25、sure maximum width and depth of pit as illus-trated in Fig. 3.7.6.1.2 Measure maximum length of intergranular attackstarting from the surface of the metal into the bulk material inthe grain direction as illustrated in Fig. 3.7.6.1.3 Guide G46is permitted to be used as an alternatemethod to evaluate
26、pitting only.FIG. 1 Test SpecimenF 2111 01a (2005)e127.6.2 See Terminology G15for definitions of terminologyrelating to corrosion and corrosion testing as a guidancedocument.8. Report8.1 Report the following information:8.1.1 Contents of test report,8.1.1.1 Description of chemical tested (examples:
27、part num-ber, formula, MSDS, or other manufacturers identificationnumber, and so forth),8.1.2 Manufacturer of chemical,8.1.3 Batch number or lot number,8.1.4 Date of manufacture,8.1.5 Dilution ratio (if applicable),8.1.6 Test alloy and material specification (metallurgicalheat number is optional),8.
28、1.7 Exposure method (examples: immersion, dip andhang, brush, spray, or other),8.1.8 Exposure temperature C (F),8.1.9 Exposure period (seconds, minutes, hours, or days),8.1.10 Measured maximum pit depth and magnification,8.1.11 Measured width of maximum pit and magnification,8.1.12 Measured length o
29、f maximum intergranular corro-sion and magnification,8.1.13 Signature of test engineer and date,8.1.14 Approval signature of laboratory supervisor or man-ager and date,8.1.15 Date tested, andFIG. 2 Mounted SpecimenFIG. 3 Maximum Width and Depth of PitF 2111 01a (2005)e138.1.16 Qualification document
30、 for conformance testing (ifapplicable) (examples: material specifications, process specifi-cations, procurement specifications).9. Keywords9.1 aircraft maintenance chemicals; end grain pitting; inter-granular attack; metallographic inspection; pit; pitting corro-sion; pitting depthASTM Internationa
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32、wn responsibility.This standard is subject to revision at any time by the responsible technical committee and 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 a
33、ddressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of 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,
34、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).F 2111 01a (2005)e14
