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ASTM B734-97(2008)

(Specification)

Standard Specification for Electrodeposited Copper for Engineering Uses

Standard Specification for Electrodeposited Copper for Engineering Uses

ABSTRACT
This specification establishes the requirements for electrodeposited copper coatings used for engineering purposes including surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interference shielding in electronic circuitry, and in certain joining operations. This specification does not cover electrodeposited copper used as a decorative finish, as an undercoat for other decorative finishes, or for electroforming. Coatings shall be classified according to thickness. Metal parts shall undergo pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and peening. Coatings shall be sampled, tested, and shall conform to specified requirements as to appearance, thickness, porosity, solderability, adhesion, embrittlement relief, and packaging.
SCOPE
1.1 This specification covers requirements for electrodeposited coatings of copper used for engineering purposes. Examples include surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interferences (EMI) shielding in electronic circuitry, and in certain joining operations.
1.2 This specification is not intended for electrodeposited copper when used as a decorative finish, or as an undercoat for other decorative finishes.
1.3 This specification is not intended for electrodeposited copper when used for electroforming.

General Information

Status
Historical
Publication Date
31-Jul-2008
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.03 - Engineering Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B734-97(2003)e1 - Standard Specification for Electrodeposited Copper for Engineering Uses
Effective Date
01-Aug-2008
Replaced By
ASTM B734-97(2013) - Standard Specification for Electrodeposited Copper for Engineering Uses
Effective Date
01-Dec-2013
Referred By
ASTM B765-03(2018) - Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings
Effective Date
01-Aug-2008

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ASTM B734-97(2008) - Standard Specification for Electrodeposited Copper for Engineering UsesASTM B734-97(2008) - Standard Specification for Electrodeposited Copper for Engineering Uses
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ASTM B734-97(2008) - Standard Specification for Electrodeposited Copper for Engineering Uses
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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
Designation:B734 −97(Reapproved 2008)
Standard Specification for
Electrodeposited Copper for Engineering Uses
This standard is issued under the fixed designation B734; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope parent or Opaque Coatings by Double-Beam Interference
Microscope Technique
1.1 This specification covers requirements for electrodepos-
B602 Test Method for Attribute Sampling of Metallic and
ited coatings of copper used for engineering purposes. Ex-
Inorganic Coatings
amples include surface hardening, heat treatment stop-off, as
B678 Test Method for Solderability of Metallic-Coated
an underplate for other engineering coatings, for electromag-
Products
netic interferences (EMI) shielding in electronic circuitry, and
B697 Guide for Selection of Sampling Plans for Inspection
in certain joining operations.
of Electrodeposited Metallic and Inorganic Coatings
1.2 This specification is not intended for electrodeposited
B762 Test Method of Variables Sampling of Metallic and
copper when used as a decorative finish, or as an undercoat for
Inorganic Coatings
other decorative finishes.
B765 GuideforSelectionofPorosityandGrossDefectTests
for Electrodeposits and Related Metallic Coatings
1.3 This specification is not intended for electrodeposited
copper when used for electroforming. B832 Guide for Electroforming with Nickel and Copper
B849 Specification for Pre-Treatments of Iron or Steel for
2. Referenced Documents
Reducing Risk of Hydrogen Embrittlement
B850 GuideforPost-CoatingTreatmentsofSteelforReduc-
2.1 ASTM Standards:
ing the Risk of Hydrogen Embrittlement
B320 Practice for Preparation of Iron Castings for Electro-
B851 Specification for Automated Controlled Shot Peening
plating
of Metallic Articles Prior to Nickel, Autocatalytic Nickel,
B374 Terminology Relating to Electroplating
or Chromium Plating, or as Final Finish
B487 Test Method for Measurement of Metal and Oxide
D3951 Practice for Commercial Packaging
Coating Thickness by Microscopical Examination of
F519 Test Method for Mechanical Hydrogen Embrittlement
Cross Section
Evaluation of Plating/Coating Processes and Service En-
B499 Test Method for Measurement of Coating Thicknesses
vironments
by the Magnetic Method: Nonmagnetic Coatings on
2.2 Military Standard:
Magnetic Basis Metals
MIL-R-81841 Rotary Flap Peening of Metal Parts
B504 Test Method for Measurement of Thickness of Metal-
MIL-S-13165 Shot Peening of Metal Parts
lic Coatings by the Coulometric Method
MIL-W-81840 Rotary Flap Peening Wheels
B507 Practice for Design of Articles to Be Electroplated on
Racks
3. Terminology
B568 Test Method for Measurement of Coating Thickness
by X-Ray Spectrometry 3.1 Definitions of Terms Specific to This Standard:
B571 Practice for Qualitative Adhesion Testing of Metallic 3.1.1 significant surfaces—those surfaces normally visible
Coatings (directlyorbyreflection)thatareessentialtotheappearanceor
B588 Test Method for Measurement of Thickness of Trans- serviceability of the article when assembled in a normal
position; or which can be the source of corrosion products that
deface visible surfaces on the assembled article. When
This specification is under the jurisdiction of ASTM Committee B08 on
necessary, the significant surface shall be indicated on the
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
drawing of the article, or by the provision of suitably marked
B08.03 on Engineering Coatings.
samples.
Current edition approved Aug. 1, 2008. Published September 2008. Originally
approved in 1984. Last previous edition approved in 2003 as B734 – 97 (2003).
NOTE 1—When significant surfaces are involved on which the specified
DOI: 10.1520/B0734-97R08.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111-5094. Attn: NPODS.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B734−97(Reapproved 2008)
thickness of coating cannot readily be controlled, such as threads, holes,
B734−97 (2008)
deep recesses, and bases of angles, it will be necessary to apply thicker
uncoated areas. The boundaries of electroplating that cover
coatings on the more accessible surfaces, or to use special racking or both.
only a portion of the surface shall, after finishing as indicated
3.1.2 inspection lot—a collection of coated articles that; are
in the drawing, be free of beads, nodules, jagged edges and
of the same type; have been produced to the same specifica-
other detrimental irregularities. Imperfections and variations in
tions; have been coated by a single supplier at one time, or at
appearance in the coating that arise from surface conditions of
approximately the same time, under essentially identical con-
the basis metal (scratches, pores, roll marks, inclusions, etc.)
ditions; and are submitted for acceptance or rejection as a
and that persist in the finish despite the observance of good
group.
metal finishing practices shall not be cause for rejection.
3.2 Definitions—For definitions of the technical terms used
NOTE 3—Electroplated finishes generally perform better when the
substrateoverwhichtheyareappliedissmoothandfreeofdeepscratches,
in this specification see Terminology B374.
tornmetal,pores,inclusions,andotherdefects.Itisrecommendedthatthe
specifications covering the unfinished product provide limits for these
4. Classification
defects. A metal finisher can often remove defects through special
4.1 The electrodeposited copper is classified according to treatments such as grinding, polishing, abrasive blasting, and special
chemical treatments. However, these are not normal treatment steps.
thickness of the electrodeposit in the following table:
When they are desired, they must be agreed upon between the buyer and
Class Minimum Thickness, µm
the producer.
25 25
20 20 6.2 Thickness—The thickness of the copper coating on the
12 12
significant surfaces shall conform to the requirements of the
specified class as defined in Section 4.
x Thickness specified
NOTE 4—Variation in the coating thickness from point-to-point on a
NOTE 2—For electroforming applications, that require much thicker
coated article is an inherent characteristic of electroplating processes.
applications, see Guide B832.
Therefore, the coating thickness will have to exceed the specified value at
some points on the significant surfaces to ensure that the thickness equals
5. Ordering Information
orexceedsthespecifiedvalueatallpoints.Asaresult,theaveragecoating
thicknessonanarticlewillusuallybegreaterthanthespecifiedvalue;how
5.1 The buyer shall supply to the producer in the purchase
muchgreaterislargelydeterminedbytheshapeofthearticle(seePractice
order or engineering drawings; marked samples or other
B507) and the characteristics of the electroplating process. Additionally,
governing documents the following information:
the average coating thickness on an article will vary from article to article
5.1.1 Title, ASTM designation number (Specification
within a production lot. Therefore, if all of the articles in a production lot
B734), and date of issue.
are to meet the thickness requirement, the average coatingthicknessofthe
production lot as a whole will be greater than the average necessary to
5.1.2 Classification or thickness of electrodeposited copper
ensure that a single article meets the requirements.
(see 4.1),
NOTE 5—When electroplating threaded parts such as machine screws,
5.1.3 Significant surfaces if other than defined in 3.1.1,
care is required to avoid too much plate buildup on the crest of the thread.
5.1.4 Sampling plan (Section 7),
In such applications a maximum plate thickness allowable on the crests
5.1.5 Number of test specimens for destructive testing
may require that thicknesses in other areas be thinner.
(Section 8), and
6.3 Porosity—When specified, the coating shall be suffi-
5.1.6 Thickness, adhesion, solderability, porosity and num-
ciently free of pores to pass the porosity test specified in 8.4.
ber of pores acceptable, or hydrogen embrittlement tests and
6.4 Solderability—When specified, the coating shall meet
methods required (Section 8).
the requirements of Test Method B678.
5.2 Where required, dimensional tolerances allowed for the
6.5 Pretreatment of Iron and Steel for Reducing the Risk of
specified electroplated copper thickness shall be specified.
Hydrogen Embrittlement—Parts for critical applications that
5.3 Inadditiontotherequirementsof5.1andwhentheparts are made of steels with ultimate tensile strengths of 1000 MPa,
to be electroplated are supplied to the electroplater by the
hardness of 31 HRC or greater, that have been machined,
buyer, the buyer shall also supply the following information as ground, cold formed, or cold straightened subsequent to heat
required. treatment, shall require stress relief heat treatment when
5.3.1 Identity of the base material by alloy identification specified by the purchaser, the tensile strength to be supplied
such as ASTM, AISI, or SAE numbers, or equivalent compo- by the purchaser. Specification B849 may be consulted for a
sition information,
list of pretreatments that are used widely.
5.3.2 Hardness of the parts, and
6.6 Post Coating Treatment of Iron and Steel for Reducing
5.3.3 Heat treatment for stress relief, whether it has been
the Risk of Hydrogen Embrittlement—Parts for critical appli-
performed or is required.
cationsthataremadeofsteelswithultimatetensilestrengthsof
5.4 If required by either party, the manufacturer of the parts 1000 MPa, hardness of 31 HRC or greater, as well as surface
hardened parts, shall require post coating hydrogen embrittle-
to be electroplated shall provide the electroplating facility with
separate test specimens (see section 8.1). ment relief baking when specified by the purchaser, the tensile
strength to be supplied by the purchaser. Specification B850
6. Coating Requirements
may be consulted for a list of post treatments that are used
widely.
6.1 Appearance—The coating on the significant surfaces of
the product shall be smooth and free of visual defects such as 6.7 Peening of Metal Parts—If peening is required before
blisters, pits, roughness, cracks, flaking, burned deposits, and electroplating to induce residual compressive stress to increase
B734−97 (2008)
fatique strength and resistance to stress corrosion cracking of 8.1.1 Special test specimens us
...

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ASTM
ASTM B555-86(2023)(Guide)
Standard Guide for Measurement of Electrodeposited Metallic Coating Thicknesses by Dropping Test

SIGNIFICANCE AND USE
4.1 The thickness of a metal coating is often critical to its performance.  
4.2 This procedure is useful for an approximate determination when the best possible accuracy is not required. For more reliable determinations, the following methods are available: Test Methods B487, B499, B504, and B568.  
4.3 This test assumes that the rate of dissolution of the coating by the corrosive reagent under the specified conditions is always the same.
SCOPE
1.1 This guide covers the use of the dropping test to measure the thickness of electrodeposited zinc, cadmium, copper, and tin coatings.  
Note 1: Under most circumstances this method of measuring coating thicknesses is not as reliable or as convenient to use as an appropriate coating thickness gauge (see Test Methods B499, B504, and B568).  
1.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.3 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.

  • Guide
    5 pages
    English language
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ASTM
ASTM B734-97(2023)(Specification)
Standard Specification for Electrodeposited Copper for Engineering Uses

ABSTRACT
This specification establishes the requirements for electrodeposited copper coatings used for engineering purposes including surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interference shielding in electronic circuitry, and in certain joining operations. This specification does not cover electrodeposited copper used as a decorative finish, as an undercoat for other decorative finishes, or for electroforming. Coatings shall be classified according to thickness. Metal parts shall undergo pre- and post-coating treatment for reducing the risk of hydrogen embrittlement, and peening. Coatings shall be sampled, tested, and shall conform to specified requirements as to appearance, thickness, porosity, solderability, adhesion, embrittlement relief, and packaging.
SCOPE
1.1 This specification covers requirements for electrodeposited coatings of copper used for engineering purposes. Examples include surface hardening, heat treatment stop-off, as an underplate for other engineering coatings, for electromagnetic interferences (EMI) shielding in electronic circuitry, and in certain joining operations.  
1.2 This specification is not intended for electrodeposited copper when used as a decorative finish, or as an undercoat for other decorative finishes.  
1.3 This specification is not intended for electrodeposited copper when used for electroforming.  
1.4 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.

  • Technical specification
    4 pages
    English language
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