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ASTM B489-85(2008)e1

(Practice)

Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals

Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals

SIGNIFICANCE AND USE
The routine measurement of the ductility of electrodeposited and autocatalytically deposited metal coatings can be useful in process control, especially when the electroplating process is used for decorative and engineering purposes.
SCOPE
1.1 This practice covers a test procedure for determining the ductility of electrodeposited and autocatalytically deposited coatings on sheet or strip basis metals. The purpose of the test is to determine the resistance of metal coatings to cracking during distortion.  
1.2 Test Methods E 8 can be used if the coatings are too ductile and require mandrels too small to be practical.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Mar-2008
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.10 - Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM B489-85(2003) - Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals
Effective Date
01-Apr-2008
Replaced By
ASTM B489-85(2013) - Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals
Effective Date
01-Dec-2013
Referred By
ASTM B984-12(2020)e1 - Standard Specification for Electrodeposited Coatings of Palladium-Cobalt Alloy for Engineering Use
Effective Date
01-Apr-2008
Referred By
ASTM B604-91(2019) - Standard Specification for Decorative Electroplated Coatings of Copper Plus Nickel Plus Chromium on Plastics
Effective Date
01-Apr-2008
Referred By
ASTM B456-17(2022) - Standard Specification for Electrodeposited Coatings of Copper Plus Nickel Plus<brk/> Chromium and Nickel Plus Chromium
Effective Date
01-Apr-2008
Referred By
ASTM B488-18 - Standard Specification for Electrodeposited Coatings of Gold for Engineering Uses
Effective Date
01-Apr-2008
Referred By
ASTM B867-95(2018) - Standard Specification for Electrodeposited Coatings of Palladium-Nickel for Engineering Use
Effective Date
01-Apr-2008
Referred By
ASTM B679-98(2021) - Standard Specification for Electrodeposited Coatings of Palladium for Engineering Use
Effective Date
01-Apr-2008
Referred By
ASTM B832-93(2018) - Standard Guide for Electroforming with Nickel and Copper
Effective Date
01-Apr-2008

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ASTM B489-85(2008)e1 - Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on MetalsASTM B489-85(2008)e1 - Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals
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ASTM B489-85(2008)e1 - Standard Practice for Bend Test for Ductility of Electrodeposited and Autocatalytically Deposited Metal Coatings on Metals
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation: B489 − 85 (Reapproved 2008)
StandardPractice for
Bend Test for Ductility of Electrodeposited and
Autocatalytically Deposited Metal Coatings on Metals
This standard is issued under the fixed designation B489; 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.
´ NOTE—The units statement in subsection 1.3 was corrected editorially in April 2008.
1. Scope 4. Significance and Use
1.1 Thispracticecoversatestprocedurefordeterminingthe 4.1 The routine measurement of the ductility of electrode-
ductility of electrodeposited and autocatalytically deposited posited and autocatalytically deposited metal coatings can be
coatings on sheet or strip basis metals. The purpose of the test useful in process control, especially when the electroplating
is to determine the resistance of metal coatings to cracking process is used for decorative and engineering purposes.
during distortion.
5. Apparatus
1.2 Test Methods E8 can be used if the coatings are too
ductile and require mandrels too small to be practical.
5.1 Series of Mandrels, with diameters from 6 to 50 mm, in
3-mmstepswithlengthsof100to150mmsotheycanbeheld
1.3 The values stated in SI units are to be regarded as
in a vise.
standard. No other units of measurement are included in this
standard. 5.2 Micrometer, to measure the thickness of the test speci-
mens.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 5.3 Guillotine Shearsorotherdevicetocutthespecimensto
responsibility of the user of this standard to establish appro- size.
priate safety and health practices and determine the applica-
5.4 File or Grindertoremoveburrsandtoroundorchamfer
bility of regulatory limitations prior to use.
edges.
5.5 Vise, to hold mandrels.
2. Referenced Documents
5.6 Magnifier, 10×.
2.1 ASTM Standards:
B177Guide for Engineering Chromium Electroplating
6. Test Specimen
D1193Specification for Reagent Water
E8Test Methods for Tension Testing of Metallic Materials
6.1 Flat specimens, 10 mm wide, and not less than 150 mm
long, shall be cut from the electroplated or coated article if the
3. Summary of Practice
shapepermits,nocloserthan25mmfromtheedges.Guillotine
3.1 The practice consists of bending a narrow strip of the shears are preferred, but any convenient method may be used.
electroplated or coated article over a mandrel. An elongation
Basis metal thickness and temper shall be suitable to permit
measurement is obtained from the smallest diameter mandrel bending around the smallest diameter mandrel, if necessary.
that does not cause the coating to fracture.
Low-carbonAISI 1010 to 1025 steel strip or sheet, 0.25 to 1.0
mm thick is usually suitable. Basis metals that have low
ductility can initiate cracks that can propagate through the
This practice is under the jurisdiction of ASTM Committee B08 on Metallic
coatings.Theprocedureindicatedin6.2shallthenbefollowed.
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 on
Test Methods.
6.2 When the shape is such that a test specimen cannot be
Current edition approved April 1, 2008. Published April 2008. Originally
obtained from the part, a test panel may be prepared of
approved in 1968. Last previous edition approved in 2003 as B489–85(2003).
appropriate basis metal, such as low-carbon steel (see 6.1),
DOI: 10.1520/B0489-85R08E01.
withthesamecoatingsysteminthesamebaths.Thepanelshall
For a discussion and theory for this test see Mohrnheim,A. F., “The BendTest
forMeasuringtheStrainLimitofSurfaces,” Plating,Vol50,1963,pp.1094–1099.
be sufficiently large to obtain several pieces after trimming 25
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mm from the edges. The specimens shall be prepared in
contactASTM Customer Service at service@astm.org. ForAnnual Book ofASTM
accordance with 6.1. Brass or copper panels may be used
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. instead of copper-electroplated zinc alloy panels.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
B489 − 85 (Reapproved 2008)
6.3 The long edges of the test pieces shall be rounded or 7.3 Exceptforveryductilecoatings,theapparentductilityis
chamfered by filing or grinding. an inverse function of the thickness. If the test is to be used to
evaluate the electroplating or autocatalytic process by periodi-
7. Procedure
cally testing the ductility of coatings produced by the process,
7.1 Place the largest mandrel in the vise. Bend the test
all specimens used must have approximately the same coating
specimen,withthecoatingoutward,overthemandrelsothatas
and total thickness.
the bend progresses the test specimen will remain in contact
with the top of the mandrel. Continue bending with slow,
8. Calculation
steadilyappliedpressureuntilthetwolegsareparallel.Ifthere
8.1 Determi
...

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