1、Designation: D1611 12Standard Test Method forCorrosion Produced by Leather in Contact with Metal1This standard is issued under the fixed designation D1611; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、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 qualitative and quantita
3、tivedetermination of corrosion produced by leather in contact withmetal. This test method does not apply to wet blue.1.2 The values stated in inch-pound units are to be regardedas the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. I
4、t 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.2. Referenced Documents2.1 ASTM Standards:2D91 Test Method for Precipitation Number of LubricatingOils2.2 Military Standar
5、d:3MIL-H-6083 (latest revision) Hydraulic Fluid, PetroleumBase, for Preservation and Operation3. Terminology3.1 Definitions:3.1.1 corrosiona modification of the metal surface incontact with a leather specimen, evidenced by visible pittingand erosion of the metal surface or by a change in mass of the
6、metal tested in comparison with a blank determination. Anypermanent discoloration in film form on the specimen (metal)that does not readily buff off with a nonabrasive cloth shall becalled incipient corrosion, while any visible pitting of the metalsurface or formation of a layer of reaction products
7、 on themetal surface shall be considered as corrosion. In the latter caseand for quantitative purposes, the corrosion level should beassessed by determination of the mass changes which occur inthe metal panel.3.1.2 staininga discoloration of the metal surface aftercontact with a leather specimen, wh
8、ich discoloration is causedby minor amounts of leathermetal interreaction productsformed on the metal surface. Such stains should readily buff offthe metal surface without permanent marring of its surfaceappearance.4. Summary of Test Method4.1 A conditioned piece of leather and two plates of thesame
9、 metal are dipped in a noncorrosive oil and drained to thedrip point. They are stacked together under a load of 25 6 5 lbf(111 6 22 N) and placed in a desiccator containing a relativehumidity of 90 to 95 % at 73.5 6 2F (23 6 1C) for a periodof 14 days. For quantitative purposes, the metal plates are
10、weighed before and after the test.5. Significance and Use5.1 The procedure is primarily intended to evaluate chromeleather intended for use in hydraulic systems under circum-stances where metal corrosion is a serious factor. A highrelative humidity is used for the purpose of accelerating theresults.
11、6. Apparatus6.1 Desiccator, containing a saturated solution of ammo-nium dihydrogen phosphate.6.2 Four Plates of the Metal to Be Tested4The surfaceroughness should be 8 to 20 in (203 to 508 nm) rms finish.They should be approximately 2 by 4 in. (51 by 102 mm) andof uniform thickness.1This test metho
12、d is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of D31.01 on Vegetable Leather. This test method wasdeveloped in cooperation with the American Leather Chemists Assn. (StandardMethod E52-1961).Current edition approved April 1, 2012. Published April 2012. O
13、riginallyapproved in 1958. Last previous edition approved in 2010 as D161100 (2010).DOI: 10.1520/D1611-12.2For 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 standa
14、rds Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.4The sole source of supply of the steel test panels-Q Panel QD35, 3 by 5 in.,surface roughness 203305 nm, known to the commi
15、ttee at this time is The Q PanelCompany, 15610 Industrial Parkway, Cleveland, OH 44135. If you are aware ofalternative suppliers, please provide this information to ASTM Headquarters. Yourcomments will receive careful consideration at a meeting of the responsibletechnical committee1, which you may a
16、ttend.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.3 Mass,256 5lb(11.36 2.3 kg).6.4 Nonabrasive ClothThe cloth should not scratch ormar the surface of the metal plates when the plates are rubbedwith the cloth, or cause any chang
17、e in the mass of the metalplates.6.5 Forceps.6.6 Analytical Balance.6.7 Piece of Glass, of approximately the length and width ofthe metal panels.7. Reagents7.1 Noncorrosive Oil, conforming to Military SpecificationMIL-H-6083 is recommended.7.2 Precipitation Naphtha, conforming to specificationsgiven
18、 in Test Method D91.8. Test Specimen8.1 The specimen shall be a piece of leather 25 by 80 mmand split to a uniform thickness.9. ProcedureQualitative9.1 Condition the leather specimen by placing it in adesiccator at 90 to 95 % relative humidity and 73.5 6 2F (236 1C) for a period of 72 h.9.2 Buff the
19、 metal plates with a nonabrasive cloth and washthem with precipitation naphtha.9.3 Immerse the humidified specimen and the metal platesin a noncorrosive oil and drain them to the drip point. Place thespecimen between the two metal plates, hold them togetherunder a mass of 25 6 5lb(11.36 2.3 kg), and
20、 place them inthe desiccator. Insert a glass plate between the top metal plateand the mass to avoid contact between dissimilar metals. Alsoprepare two control plates in the same manner. Place them inthe desiccator so that they do not touch each other or thespecimen. Then close the desiccator and hol
21、d the specimen andplates at 90 to 95 % relative humidity at 73.5 6 2F (23 61C) for a period of 14 days.9.4 At the end of 14 days, inspect the surfaces of the platesthat were in contact with the leather specimen and comparethem with the control plates. To facilitate inspection andevaluation, the plat
22、es may be washed with precipitation naph-tha and buffed with the nonabrasive cloth.10. ProcedureQuantitative10.1 For quantitative evaluation, the procedure shall be thesame as for qualitative testing, except that the metal plates shallbe handled with forceps and weighed to the nearest 1 mg afterbuff
23、ing and washing with precipitation naphtha and beforedipping in the noncorrosive oil. At the conclusion of the test,weigh the plates again after washing in naphtha and buffingwith the nonabrasive cloth.10.2 Handle the two metal control plates having the samedimensions as the test plates in exactly t
24、he same manner as thetest plates with the exception that they shall not be brought intocontact with the specimen.10.3 At the conclusion of the test, apply any change in massof the control plates as a correction to the change in mass of thetest plates. The result is the change in mass of the test pla
25、tesfrom being in contact with the leather specimen.11. Report11.1 For qualitative purposes, report the leather as beingeither noncorrosive, causing staining, causing incipient corro-sion, or causing corrosion.11.2 For quantitative purposes, if visible pitting is evidentrecord the total number of pit
26、 marks. If erosion is evident,report the percent area of erosion. In the absence of visiblepitting or erosion, express the corrosion level as a gain or lossin milligrams per square centimetre. This is obtained bydividing the change in mass of the test plates from being incontact with the specimen (1
27、0.3) by the area of the leatherspecimen in contact with the plates. If there is no change in themass of the plates from being in contact with the specimenreport the leather as being noncorrosive.12. Precision and Bias12.1 The precision of the quantitative results depends on theprecision of the measu
28、rement of the mass changes of the metalpanels, the method of determining the area of erosion, andcorrectly counting pit marks.13. Keywords13.1 corrosion; leather; metal corrosion by leatherASTM International takes no position respecting the validity of any patent rights asserted in connection with a
29、ny item mentionedin 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 technica
30、l 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 addressed to ASTM International Headquarters. Your comments will receive careful consideration
31、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, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor
32、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D1611 122
