ASTM B689-97(2023)

Standard Specification for Electroplated Engineering Nickel Coatings

ABSTRACT
This specification covers the requirements for electroplated nickel coatings applied to metal products for engineering applications (for example, for use as a buildup for mismachined or worn parts), for electronics applications (including as underplates in contacts or interconnections), and in certain joining applications. Coatings shall be available in any one of the following types: Type 1, coatings electroplated from solutions not containing hardeners, brighteners, or stress control additives; Type 2, electrodeposits used at moderate temperatures, and contain sulfur or other codeposited elements or compounds that are present to increase the hardness, refine grain structure, or control internal stress; and Type 3, electroplates containing dispersed submicron particles such as silicon carbide, tungsten carbide, and aluminum oxide that are present to increase hardness and wear resistance at specified temperatures. Metal parts shall undergo pre- and post-coating treatments to reduce the risk of hydrogen embrittlement, and peening. Coatings shall be sampled, tested, and conform accordingly to specified requirements as to appearance, thickness (measured either destructively by microscopical or coulometric method, or nondestructively by magnetic or X-ray method), adhesion (examined either by bend, file, heat and quench, or push test), porosity (assessed either by hot water, ferroxyl, or flowers of sulfur test), workmanship, and hydrogen embrittlement relief.
SCOPE
1.1 This specification covers the requirements for electroplated nickel coatings applied to metal products for engineering applications, for example, for use as a buildup for mismachined or worn parts, for electronic applications, including as underplates in contacts or interconnections, and in certain joining applications.  
1.2 Electroplating of nickel for engineering applications (Note 1) requires technical considerations significantly different from decorative applications because the following functional properties are important:  
1.2.1 Hardness, strength, and ductility,  
1.2.2 Wear resistance,  
1.2.3 Load bearing characteristics,  
1.2.4 Corrosion resistance,  
1.2.5 Heat scaling resistance,  
1.2.6 Fretting resistance, and  
1.2.7 Fatigue resistance.  
Note 1: Functional electroplated nickel coatings usually contain about 99 % nickel, and are most frequently electrodeposited from a Watts nickel bath or a nickel sulfamate bath. Typical mechanical properties of nickel electroplated from these baths, and the combined effect of bath operation and solution composition variables on the mechanical properties of the electrodeposit are given in Guide B832. When electroplated nickel is required to have higher hardnesses, greater wear resistance, certain residual stress values and certain leveling characteristics, sulfur and other substances are incorporated in the nickel deposit through the use of certain addition agents in the electroplating solution. For the effect of such additives, see Section 4 and Annex A3. Cobalt salts are sometimes added to the plating solution to produce harder nickel alloy deposits.  
1.3 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.  
1.4 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.

General Information

• Status: Published
• Publication Date: 30-Apr-2023
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.03 - Engineering Coatings

Relations

• Refers: ASTM F519-23 - Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments
• Effective Date: 01-Dec-2023
• Refers: ASTM B571-23 - Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
• Effective Date: 01-Nov-2023
• Refers: ASTM B849-02(2023) - Standard Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement
• Effective Date: 01-Nov-2023
• Refers: ASTM B832-93(2023) - Standard Guide for Electroforming with Nickel and Copper
• Effective Date: 01-Nov-2023
• Refers: ASTM B765-03(2023) - Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings
• Effective Date: 01-Nov-2023
• Refers: ASTM D3951-18(2023) - Standard Practice for Commercial Packaging
• Effective Date: 01-Oct-2023
• Refers: ASTM B320-60(2019) - Standard Practice for Preparation of Iron Castings for Electroplating
• Effective Date: 01-Apr-2019
• Refers: ASTM B558-79(2019) - Standard Practice for Preparation of Nickel Alloys for Electroplating
• Effective Date: 01-Apr-2019
• Refers: ASTM B849-02(2019) - Standard Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement
• Effective Date: 01-Apr-2019
• Refers: ASTM B281-88(2019)e1 - Standard Practice for Preparation of Copper and Copper-Base Alloys for Electroplating and Conversion Coatings
• Effective Date: 01-Apr-2019
• Refers: ASTM F519-18 - Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments
• Effective Date: 01-Nov-2018
• Refers: ASTM B571-18 - Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
• Effective Date: 01-Aug-2018
• Refers: ASTM B765-03(2018) - Standard Guide for Selection of Porosity and Gross Defect Tests for Electrodeposits and Related Metallic Coatings
• Effective Date: 01-Aug-2018
• Refers: ASTM B809-95(2018) - Standard Test Method for Porosity in Metallic Coatings by Humid Sulfur Vapor (“Flowers-of-Sulfur”)
• Effective Date: 01-Aug-2018
• Refers: ASTM B832-93(2018) - Standard Guide for Electroforming with Nickel and Copper
• Effective Date: 01-Jun-2018

Overview

ASTM B689-97(2023), Standard Specification for Electroplated Engineering Nickel Coatings, establishes the requirements for electroplated nickel coatings on metal products intended for engineering, electronic, and certain joining applications. This international standard details the types of nickel coatings, thickness classes, pre- and post-coating treatments, and conformity testing procedures. Its primary goal is to ensure that nickel electroplating delivers the required functional performance, including durability, wear resistance, and corrosion resistance.

Electroplated engineering nickel coatings differ from decorative coatings by prioritizing properties such as hardness, ductility, and fatigue resistance rather than appearance. Applications of this standard are found in wear- and corrosion-critical sectors such as automotive, electronics, food processing, heavy-duty machinery, and more.

Key Topics

• Coating Types: ASTM B689 covers three types of nickel coatings:

  • Type 1: Electroplated without hardeners or additives, resulting in ductile engineering nickel.
  • Type 2: Incorporates sulfur or other codeposited elements to enhance hardness, control stress, and refine grain structure.
  • Type 3: Contains dispersed particles (e.g., silicon carbide, tungsten carbide) to increase hardness and wear resistance at elevated temperatures.

• Functional Properties:

  • Hardness and ductility for engineering performance
  • Wear and fretting resistance for moving or mating parts
  • Load-bearing capacity and fatigue resistance
  • Corrosion and heat-scaling resistance

• Thickness Classification: Coating thickness is specified in classes (5 μm, 25 μm, 50 μm, 100 μm, 200 μm, or as specified), with requirements tailored to application demands.

• Testing and Inspection:

  • Appearance, thickness (using microscopic, coulometric, magnetic, or X-ray methods)
  • Adhesion (bend, file, heat and quench, or push test)
  • Porosity (hot water, ferroxyl, or flowers of sulfur tests)
  • Hydrogen embrittlement relief and assessment

• Pre- and Post-Coating Treatments:

  • Procedures for cleaning and preparing different metals
  • Methods to reduce hydrogen embrittlement risk
  • Peening options to improve fatigue strength and stress corrosion resistance

Applications

Electroplated engineering nickel coatings, as specified in ASTM B689-97(2023), are crucial for industries requiring reliable component performance under wear, corrosion, or structural stress. Common applications include:

• Wear and Corrosion Protection:

  • Automotive components such as hydraulic rams, cylinder liners, pistons, gears, and shafts
  • Paper, textiles, and plastic processing equipment (e.g., rolls, dies, and extrusion components)
  • Food processing and chemical industry equipment (for product purity and corrosion protection)
  • Electronic applications, providing underplates for contacts and interconnections

• Salvage and Repair:

  • Restoring mismachined or worn machinery parts, extending service life of components in heavy-duty machinery and aerospace
  • Selective electroplating for precise dimensional restoration

• Specialized Performance:

  • Increasing wear resistance in mining, printing, and industrial equipment
  • Enhancing component performance in high-temperature environments
  • Ensuring fatigue resistance and reliability in cyclically loaded members

Related Standards

For comprehensive implementation and quality assurance, ASTM B689-97(2023) references and aligns with several related ASTM and industry standards:

• ASTM B183, B242, B252, B253, B254, B281, B320, B322, B343: Practices and guides for preparing various metal substrates for electroplating
• ASTM B487, B499, B530, B568: Test methods for measuring metal coating thickness
• ASTM B571: Adhesion testing of metallic coatings
• ASTM B602, B697, D762: Sampling plans for inspection and assessment
• ASTM B849, B850: Procedures for hydrogen embrittlement risk reduction
• ASTM B765, B809: Methods for porosity testing
• ASTM B832: Guide for electroforming with nickel and copper
• Relevant Military Standards: Shot peening and hydrogen embrittlement evaluation

Conclusion

ASTM B689-97(2023) is a key standard for ensuring the quality and functionality of electroplated engineering nickel coatings across many industries. Adherence to this specification provides confidence in the durability, performance, and reliability of nickel-plated metal components, contributing to safer and longer-lasting products in demanding engineering and electronic applications. For further guidance or specific technical requirements, always reference the latest version of the ASTM standard and related documents.

Standards Content (Sample)

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: B689 − 97 (Reapproved 2023)
Standard Specification for
Electroplated Engineering Nickel Coatings
This standard is issued under the fixed designation B689; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers the requirements for electro-
mendations issued by the World Trade Organization Technical
plated nickel coatings applied to metal products for engineer-
Barriers to Trade (TBT) Committee.
ing applications, for example, for use as a buildup for misma-
chined or worn parts, for electronic applications, including as
2. Referenced Documents
underplates in contacts or interconnections, and in certain
2.1 ASTM Standards:
joining applications.
B183 Practice for Preparation of Low-Carbon Steel for
1.2 Electroplating of nickel for engineering applications
Electroplating
(Note 1) requires technical considerations significantly differ-
B242 Guide for Preparation of High-Carbon Steel for Elec-
ent from decorative applications because the following func-
troplating
tional properties are important:
B252 Guide for Preparation of Zinc Alloy Die Castings for
1.2.1 Hardness, strength, and ductility,
Electroplating and Conversion Coatings
1.2.2 Wear resistance,
B253 Guide for Preparation of Aluminum Alloys for Elec-
1.2.3 Load bearing characteristics,
troplating
1.2.4 Corrosion resistance,
B254 Practice for Preparation of and Electroplating on
1.2.5 Heat scaling resistance,
Stainless Steel
1.2.6 Fretting resistance, and
B281 Practice for Preparation of Copper and Copper-Base
1.2.7 Fatigue resistance.
Alloys for Electroplating and Conversion Coatings
B320 Practice for Preparation of Iron Castings for Electro-
NOTE 1—Functional electroplated nickel coatings usually contain about
99 % nickel, and are most frequently electrodeposited from a Watts nickel
plating
bath or a nickel sulfamate bath. Typical mechanical properties of nickel
B322 Guide for Cleaning Metals Prior to Electroplating
electroplated from these baths, and the combined effect of bath operation
B343 Practice for Preparation of Nickel for Electroplating
and solution composition variables on the mechanical properties of the
with Nickel
electrodeposit are given in Guide B832. When electroplated nickel is
required to have higher hardnesses, greater wear resistance, certain
B374 Terminology Relating to Electroplating
residual stress values and certain leveling characteristics, sulfur and other
B480 Guide for Preparation of Magnesium and Magnesium
substances are incorporated in the nickel deposit through the use of certain
Alloys for Electroplating
addition agents in the electroplating solution. For the effect of such
B487 Test Method for Measurement of Metal and Oxide
additives, see Section 4 and Annex A3. Cobalt salts are sometimes added
Coating Thickness by Microscopical Examination of
to the plating solution to produce harder nickel alloy deposits.
Cross Section
1.3 This standard does not purport to address all of the
B499 Test Method for Measurement of Coating Thicknesses
safety concerns, if any, associated with its use. It is the
by the Magnetic Method: Nonmagnetic Coatings on
responsibility of the user of this standard to establish appro-
Magnetic Basis Metals
priate safety, health, and environmental practices and deter-
B507 Practice for Design of Articles to Be Electroplated on
mine the applicability of regulatory limitations prior to use.
Racks
1.4 This international standard was developed in accor-
B530 Test Method for Measurement of Coating Thicknesses
dance with internationally recognized principles on standard-
by the Magnetic Method: Electrodeposited Nickel Coat-
ings on Magnetic and Nonmagnetic Substrates
This specification is under the jurisdiction of ASTM Committee B08 on
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
B08.03 on Engineering Coatings. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2023. Published June 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
ɛ1
approved in 1981. Last previous edition approved in 2018 as B689 – 97 (2018) . Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0689-97R23. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B689 − 97 (2023)
B558 Practice for Preparation of Nickel Alloys for Electro- 4. Classification
plating
4.1 Electroplated nickel shall be provided in any one of the
B568 Test Method for Measurement of Coating Thickness
following three types (Note 2):
by X-Ray Spectrometry
4.1.1 Type 1—Nickel electroplated from solutions not con-
B571 Practice for Qualitative Adhesion Testing of Metallic
taining hardeners, brighteners, or stress control additives.
Coatings
4.1.2 Type 2—Nickel electrodeposits used at moderate tem-
B602 Guide for Attribute Sampling of Metallic and Inor-
peratures and containing sulfur or other codeposited elements
ganic Coatings
or compounds that are present to increase the hardness, to
B697 Guide for Selection of Sampling Plans for Inspection
refine the grain structure, or to control the internal stress of the
of Electrodeposited Metallic and Inorganic Coatings
electrodeposited nickel.
B765 Guide for Selection of Porosity and Gross Defect Tests
4.1.3 Type 3—Electrodeposited nickel containing dispersed
for Electrodeposits and Related Metallic Coatings
submicron particles, such as silicon carbide, tungsten carbide,
B809 Test Method for Porosity in Metallic Coatings by
and aluminum oxide that are present to increase hardness and
Humid Sulfur Vapor (“Flowers-of-Sulfur”)
wear resistance at temperatures above 325 °C (618 °F).
B832 Guide for Electroforming with Nickel and Copper
B849 Specification for Pre-Treatments of Iron or Steel for
NOTE 2—Good adhesion of electroplated nickel to stainless steels and
Reducing Risk of Hydrogen Embrittlement
high alloy steels usually requires a preliminary strike of electrodeposited
B850 Guide for Post-Coating Treatments of Steel for Reduc- nickel. The recommended practices for the preparation of and electroplat-
ing on stainless steels and nickel alloys are given in Practices B254 and
ing the Risk of Hydrogen Embrittlement
B558, respectively.
B851 Specification for Automated Controlled Shot Peening
4.2 Thickness Classification—The electroplated nickel
of Metallic Articles Prior to Nickel, Autocatalytic Nickel,
or Chromium Plating, or as Final Finish thickness, in view of the wide variety for industrial uses, shall
be specified according to the following classes (Note 3):
D762 Method of Test for Hot Extraction of Asphaltic Mate-
rials and Recovery of Bitumen by the Modified Abson
Class Minimum Nickel Thickness, μm
5 5
Procedure (Withdrawn 1965)
25 25
D1193 Specification for Reagent Water
50 50
D3951 Practice for Commercial Packaging
100 100
200 200
F519 Test Method for Mechanical Hydrogen Embrittlement
X thickness as specified
Evaluation of Plating/Coating Processes and Service En-
vironments NOTE 3—There is no technical limit to the nickel thickness that can be
electroplated. There are practical limits to nickel thickness and uniformity
2.2 Military Standards:
of thickness distribution caused by the size and geometric configuration of
MIL-R-81841 Rotary Flap Peening of Metal Parts
the parts. (See 3.1.)
MIL-S-13165 Shot Peening of Metal Parts
MIL-W-81840 Rotary Flap Peening Wheels
5. Ordering Information
5.1 The buyer shall supply the following information to the
3. Terminology
seller in either the purchase order or engineering drawings,
3.1 Definitions:
marked samples, or other governing documents.
3.1.1 significant surfaces—those surfaces normally visible
5.1.1 Title, ASTM designation number, and year of the
(directly or by reflection) that are essential to the appearance or
standard.
serviceability of the article when assembled in normal position;
5.1.2 Classification type and thickness classification of elec-
or that can be the source of corrosion products that deface
troplated nickel to be applied (see 4.1 and 4.2).
visible surfaces on the assembled article. When necessary, the
5.1.3 Significant surfaces (see 3.1).
significant surfaces shall be indicated on the drawing for the
5.1.4 Sampling plan (see Section 8).
article, or by the provision of suitably marked samples.
3.1.1.1 Discussion—The thickness of the electrodeposit in
5.1.5 Number of test specimens for destructive testing (see
holes, corners, recesses, and other areas where thickness 7.1). Identify the substrate material by alloy identification, such
cannot be controlled under normal electroplating conditions
as by ASTM, AISI, or SAE numbers, or by equivalent
shall be specified by the buyer (see Note 3). composition information.
3.1.1.2 Discussion—When a deposit of controlled thickness
5.1.6 The thickness, adhesion, porosity, and hydrogen em-
is required in holes, corners, recesses, and similar areas, special
brittlement tests required. See 6.3 – 6.7.
racking, auxiliary anodes or shielding will be necessary.
5.1.7 The required grinding or polishing operations of the
3.2 Terminology B374 contains most of the terms used in basis metal as are necessary to yield deposit with the desired
properties.
this specification.
5.1.8 Where required, the basis metal finish shall be speci-
fied in terms of centerline average (CLA), or arithmetical
The last approved version of this historical standard is referenced on
average (AA).
www.astm.org.
5.1.9 Appearance: whether superficial staining from final
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. rinsing or discoloration after baking is acceptable.
B689 − 97 (2023)
5.1.10 Where required, post-treatment grinding or machin- (scratches, pores, roll marks, inclusions, etc.) and that persist in
ing shall be specified for parts which are to be electroplated and the finish despite the observance of good metal finishing
subsequently ground or machined to size. practices shall not be cause for rejection (Note 5).
5.1.11 Where required dimensional tolerances allowed for 6.1.2 For parts that are electroplated and subsequently
the specified electroplated nickel thickness or class shall be ground to size, the grinding shall be done with a sulfur-free
specified. liquid coolant, never dry, and with a sufficiently light cut to
5.1.12 Where required, microhardness ranges shall be speci- prevent cracking.
fied for the nickel deposit.
NOTE 5—Applied finishes generally perform better in service when the
5.1.13 The buyer of the parts to be electroplated shall
substrate over which they are applied is smooth and free of torn metal,
provide the electroplater with the following information as inclusions, pores, and other defects. It is recommended that the specifi-
cations covering the unfinished product provide limits for these defects. A
required:
metal finisher can often remove defects through special treatments, such
5.1.13.1 Ultimate tensile strength of the parts.
as grinding, polishing, abrasive blasting, chemical treatments, and elec-
5.1.13.2 Rockwell C hardness of the parts.
tropolishing. However, these are not normal in the treatment steps
5.1.13.3 Heat treatment for stress relief, whether it has been
preceding the application of the finish. When they are desired they must
performed or is required (see 6.2). be stated in the purchase order (see 5.1.7).
5.1.13.4 Heat treatment for hydrogen embrittlement relief
6.2 Pretreatment of Iron and Steel for Reducing the Risk of
(see 6.3 and Test Method F519).
Hydrogen Embrittlement—Parts for critical applications that
5.1.13.5 Tensile loads required for the embrittlement relief
are made of steels with ultimate tensile strengths of 1000 MPa,
test, if applicable.
hardness of 31 HRC or greater, that have been machined,
5.1.13.6 Procedures and requirements for peening to induce
ground, cold formed, or cold straightened subsequent to heat
residual compressive stress in specified surfaces (see Note 4
treatment, shall require stress relief heat treatment when
and 6.4).
specified by the purchaser, the tensile strength to be supplied
by the purchaser. Specification B849 may be consulted for a
NOTE 4—Electroplating on hardened (high alloy and high carbon) steels
list of pretreatments that are used widely.
can reduce the fatigue strength of the metal parts. This must be considered
if the parts will be subjected to repeated applications of complex load
6.3 Post-Coating Treatments of Iron and Steel for Reducing
patterns in service. Shot peening of significant surfaces before electro-
the Risk of Hydrogen Embrittlement—Parts for critical appli-
plating can reduce the loss of fatigue strength. Rotary flap peening, a
cations that are made of steels with ultimate tensile strengths of
manual method, can also be used in the repair of components in the field
where conventional shot peening equipment is not available. If rotary flap
1000 MPa, hardness of 31 HRC or greater, as well as surface
peening is used, extreme care should be taken to ensure that the entire
hardened parts, shall require post coating hydrogen embrittle-
surface to be treated has been peened. Also, reduction in the fatigue life of
ment relief baking when specified by the purchaser, the tensile
nickel-electroplated steels can be reduced by considering the relations
strength to be supplied by the purchaser. Specification B850
among the variables that influence fatigue life of nickel-electroplated,
hardened steels. may be consulted for a list of post treatments that are used
widely.
5.1.13.7 What, if any, mechanical treatment was applied by
the manufacturer to the significant surface; that is, particulate 6.4 Peening of Metal Parts—If peening is required before
blasting, grinding, polishing, or peening. electroplating to induce residual compressive stress to increase
5.1.14 The manufacturer of the parts to be electroplated fatigue strength and resistance to stress corrosion cracking of
shall provide the electroplating facility with test specimens (see the metal parts, refer to Specification B851 and to MIL-S-
Section 7) to be electroplated for conformance tests as re- 13165, MIL-R-81841, and MIL-W-81840.
quested for preparation, control, inspection, and lot acceptance.
6.5 Thickness—The thickness of the coating everywhere on
the significant surface shall conform to the requirements of the
6. Coating Requirements
specified class as defined in 4.2 (see Note 6 and 7.2).
6.1 Appearance:
NOTE 6—The coating thickness requirements of this specification are
6.1.1 The coating on the significant surfaces of the product
minimum requirements; that is, the coating thickness is required to equal
shall be smooth and free of visual defects such as blisters, pits,
or exceed the specified thickness everywhere on any significant surface
roughness, cracks, flaking, burned deposits, and uncoated (see 3.1.1). Variation in the coating thickness from point to point on a
coated article is an inherent characteristic of the electroplating process.
areas. Visual defects are defined as those visible, unmagnified,
Therefore, the coating thickness will have to exceed the specified value at
to the unaided eye, 20/20 vision, or vision corrected to 20/20.
some points on the significant surfaces to ensure that the thickness equals
The boundaries of electroplating that cover only a portion of
or exceeds the minimum specified value at all points. Hence, in most
the surface shall, after finishing as indicated in the drawing, be
cases, the average coating thickness on an article will be greater than the
specified value; how much greater is largely determined by the shape of
free of beads, nodules, jagged edges, and other detrimental
the article (see Practice B507) and the characteristics of the electroplating
irregularities. Imperfections and variations in appearance in the
process. In addition, the average coating thickness on articles will vary
coating that arise from surface conditions of the basis metal
from article to article within a production lot. Therefore, if all of the
articles in a production lot are to meet the thickness requirement, the
average coating thickness for the production lot as a whole will be greater
Hammond, R. A. F., “Technical Proceedings,” TPAEA, American Electroplat-
that the average necessary to assure that a single article meets the
ers’ Society, 1964, pp. 9–20.
requirement.
Sanborn, C. B., and Carlin, F. S., “Influence of Nickel Plating on the Fatigue
6.6 Adhesion—The coating shall be sufficiently adherent to
Life of Hardened Steel,” Electrodeposited Metals for Selected Applications. Battelle
Memorial Institute, Columbus, OH, November 1973. the basis metal to pass the adhesion test specified (see 7.3).
B689 − 97 (2023)
6.7 Porosity—The coating shall be sufficiently free of pores steps that have a bearing on the coating thickness. In rack
to pass the porosity test specified (see 7.4). plating, the specimen shall be racked in the same way with the
same distance from and orientation with the anodes and other
6.8 Workmanship—Adding to (spotting-in) or double
items in the process as the article it represents.
electroplating, unless evidence of a satisfactory bond is
established, shall be cause for rejection (see 7.3). Parts having
NOTE 9—When special test specimens are used to represent coated
a hardness greater than 35 HRC (equivalent to a tensile articles in a thickness test, the specimens will not necessarily have the
same thickness and thickness distribution as the articles unless the
strength of 1200 MPa or greater) that have been acid-stripped
specimens and the articles are of the same general size and shape.
for recoating shall be rebaked for e
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