ASTM B490-92(1998)
(Practice)Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits
Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits
SCOPE
1.1 This practice describes a procedure for measuring the ductility of electrodeposited foils.
1.2 This practice is suitable only for the evaluation of electrodeposits having low ductility.
1.3 The obtained ductility values must only be considered semi-quantitative because this test has a significant operator dependence.
1.4 This practice is best used for in-house process control where measurements are always made by the same operator. A change in ductility value can be used as an indication of possible changes in the electroplating solution.
1.5 This standard does not purport to address the safety problems, 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.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: B 490 – 92 (Reapproved 1998)
Standard Practice for
Micrometer Bend Test for Ductility of Electrodeposits
This standard is issued under the fixed designation B 490; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
NOTE 1—The foils used in this practice are typically 25 to 40 μm thick.
1. Scope
Foils in this thickness range do not have the same properties as bulk metal.
1.1 This practice describes a procedure for measuring the
For example, a nickel electrodeposit 0.5 mm thick, prepared in purified
ductility of electrodeposited foils.
bright nickel electroplating solutions for which this test is being used, had
1.2 This practice is suitable only for the evaluation of
less than 3 % elongation in a tension test, and could not be bent to a 90°
electrodeposits having low ductility. angle without complete fracture. However, foils 25 to 40 μm thick,
electroplated at the same time, had micrometer ductility values in the 10
1.3 The obtained ductility values must only be considered
to 25 % range.
semi-quantitative because this test has a significant operator
dependence.
5. Apparatus
1.4 This practice is best used for in-house process control
5.1 Micrometer, 25-mm with flat jaws to measure the
where measurements are always made by the same operator. A
thickness and to compress the foil.
change in ductility value can be used as an indication of
5.2 Hand or Power Shear, grinding wheel, or hack saw, to
possible changes in the electroplating solution.
trim the edges of the electroplated panel and to separate the foil
1.5 This standard does not purport to address the safety
from the basis metal.
problems, if any, associated with its use. It is the responsibility
5.3 Pair of Sharp Scissors to cut the test specimens.
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
6. Test Specimens
limitations prior to use.
6.1 An electrodeposit shall be prepared using a basis metal
with a smooth surface from which the electrodeposit can be
2. Referenced Documents
readily separated. A stainless steel or nickel electroplated steel
2.1 ASTM Standards:
panel may be used for this purpose, prepared as in 6.2.
B 177 Guide for Chromium Electroplating on Steel for
3 6.2 A piece of cold-rolled steel, of any convenient size, such
Engineering Use
as 100 by 150 mm, shall be properly cleaned, acid dipped, and
3. Summary of Practice electroplated with approximately 7.5 μm of nickel. After
rinsing, the specimen shall be cleaned anodically for 15 s in a
3.1 This practice consists of measuring the bend of a foil
hot alkaline cleaner, rinsed, acid dipped in about 1 N sulfuric
held between the jaws of a micrometer; these are closed until
acid (about 27 mL of concentrated sulfuric acid added to about
fracture or cracks appear.
900 mL of cold water, mixed, and diluted with cold water to 1
4. Significance and Use L), and immediately placed in the electroplating solution of the
metal to be tested. An electrodeposit 25 to 40 μm thick shall be
4.1 This practice is useful as one method of controlling
electroplated on the prepared surface. The deposit shall be
some electroplating solutions. It serves to indicate the presence
plated at an average current density and under conditions
of contamination or some other adverse condition.
(agitation, temperature, etc.) approximating those used on parts
4.2 Ductility measurements are of particular value when
plated in the solution being tested.
electroplated parts are to be subjected to moderate stress such
6.3 The volume of the plating solution used to produce the
as that involved in bolting an electroplated bumper to an
test specimen shall be sufficient so that the concentration of the
automobile.
additives do not drop below 90 % of original additive concen-
tration. Additions to the test solution shall not be made since
This practice is under the jurisdiction of ASTM Committee B-8 on Metallic and
they can alter the original composition.
Inorganic Coatingsand is the direct responsibility of Subcommittee B08.10 on
General Test Methods.
NOTE 2—The ductility of nickel, with or without chromium, will vary
Current edition approved Oct. 30, 1992. Published March 1993. Originally
depending upon plating conditions, contamination, and the additive
published as B 490 –
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