ASTM D8365-20

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D8365 − 20
Standard Test Method for
Corrosion of Metal Produced by Contact with Leather
This standard is issued under the fixed designation D8365; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope visible pitting of the metal surface or formation of a layer of
reaction products on the metal surface shall be considered as
1.1 This test method covers the qualitative determination of
corrosion.
corrosion produced by leather in contact with metal. This test
3.1.2 sandwich corrosion test, n—acomparativeaccelerated
method does not apply to wet blue or wet white.
environmental test of the corrosivity of solid materials such as
1.2 The values stated in inch-pound units are to be regarded
various alloys in contact with leather.
as standard. The values given in parentheses are mathematical
3.1.3 staining, n—a discoloration of the metal surface after
conversions to SI units that are provided for information only
contact with a leather specimen, which discoloration is caused
and are not considered standard.
by minor amounts of leather—metal interaction products
1.3 This standard does not purport to address all of the
formedonthemetalsurface.Suchstainsshouldreadilybuffoff
safety concerns, if any, associated with its use. It is the
the metal surface without permanent marring of its surface
responsibility of the user of this standard to establish appro-
appearance.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Summary of Test Method
1.4 This international standard was developed in accor-
4.1 Leather swatch and a metal plate are stacked together
dance with internationally recognized principles on standard-
under a load of 25 6 5 lbf (111 6 22 N) and placed in a
ization established in the Decision on Principles for the
humidity/temperature test chamber maintained at a relative
Development of International Standards, Guides and Recom-
humidity of 90 to 95% at 38 6 1°C (100 6 2°F) for a period
mendations issued by the World Trade Organization Technical
of 14 days.
Barriers to Trade (TBT) Committee.
2. Referenced Documents 5. Significance and Use
5.1 The procedure is primarily intended to evaluate corro-
2.1 ASTM Standards:
D1193Specification for Reagent Water sion produced by leather in contact with metals or metal
objects that are used in construction and production of
E104Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions upholstery, briefcases, watches, jewelry, gun holsters, knife
sheaths and any other circumstances where leather is in direct
3. Terminology contact with various metal hardware and under circumstances
where metal corrosion is a serious factor. A high relative
3.1 Definitions:
humidity and increased temperature is used for the purpose of
3.1.1 corrosion, n—a modification of the metal surface in
accelerating the results.
contact with a leather specimen, evidenced by visible pitting
and erosion of the metal surface in comparison with a blank 5.2 Therelativecorrosionseverityratingsystemisprovided
determination. Any permanent discoloration in film form on in order to allow a numerical classification of the test results
the specimen (metal) that does not readily buff off with a and to eliminate the necessity for elaborate weight loss
nonabrasiveclothshallbecalledincipientcorrosion,whileany measurements. Pitting corrosion, which is rated 4—extensive
(severe) corrosion, may involve only a negligible weight loss.
1 6. Apparatus and Reagents
ThistestmethodisunderthejurisdictionofASTMCommitteeD31onLeather
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather.
6.1 Humidity/Temperature Test Cabinet, capable of main-
Current edition approved Dec. 1, 2020. Published December 2020. DOI:
taining 5 to 100 % relative humidity at 38 6 1°C (100 6 2°F).
10.1520/D8365-20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Desiccator, containing a saturated solution of ammo-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
nium dihydrogen phosphate (may use combination of salts
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. from Practice E104 to achieve same humidity level).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D8365 − 20
6.3 Oven,forcedaircirculation,capableofmaintaining37.7 Metal #3=Type 321 Stainless Steel,
6 1°C (100 6 2°F). Metal #4=Type Grade 2 Titanium.
6.4 Metal to Be Tested—The surface roughness should be 8
Section A – Leather in contact with metal
to 20 µin. (203 to 508 nm) rms finish. They should be
8.4 Place the metal plate (or metal object that is specified in
approximately 25 by 100 mm and of uniform thickness.
agreement) next to the leather specimen (place the side of
Surface may be cleaned using acetone.
leather, that is, grain or flesh side that most likely will be in
6.5 Mass, 25 65lb(11.3 6 2.3 kg).
contact with metal during use), hold the metal/leather combi-
6.6 Nonabrasive Cloth—Theclothshouldnotscratchormar nation under a mass of 25 65lb(11.3 6 2.3 kg), and place
the surface of the metal plates when the plates are rubbed with them in the humidity/temperature test chamber.Also test blank
the cloth, or cause any change in the mass of the metal plates. controlmetalplateinthesamemanner.Holdthespecimenand
platesat90to95%relativehumidityat38 61°
...