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ASTM B766-86(2003)

(Specification)

Standard Specification for Electrodeposited Coatings of Cadmium

Standard Specification for Electrodeposited Coatings of Cadmium

SCOPE
1.1 This specification covers the requirements for electrodeposited cadmium coatings on products of iron, steel, and other metals.
Note 1—Cadmium is deposited as a coating principally on iron and steel products. It can also be electrodeposited on aluminum, brass, beryllium copper, copper, nickel, and powder metallurgy parts.
1.2 The coating is provided in various thicknesses up to and including 25 μm either as electrodeposited or with supplementary finishes.
1.3 Cadmium coatings are used for corrosion resistance and for corrosion prevention of the basis metal part. The as-deposited coating (Type I) is useful for the lowest cost protection in a mild or noncorrosive environment where early formation of white corrosion products is not detrimental or harmful to the function of a component. The prime purpose of the supplementary chromate finishes (Types II and III) on the electroplated cadmium is to increase corrosion resistance. Chromating will retard or prevent the formation of white corrosion products on surfaces exposed to various environmental conditions as well as delay the appearance of corrosion from the basis metal.
1.4 Cadmium plating is used to minimize bi-metallic corrosion between high-strength steel fasteners and aluminum in the aerospace industry. Undercutting of threads on fastener parts is not necessary as the cadmium coating has a low coefficient of friction that reduces the tightening torque required and allows repetitive dismantling.
1.5 Cadmium-coated parts can easily be soldered without the use of corrosive fluxes. Cadmium-coated steel parts have a lower electrical contact resistance than zinc-coated steel. The lubricity of cadmium plating is used on springs for doors and latches and for weaving machinery operating in high humidity. Corrosion products formed on cadmium are tightly adherent. Unlike zinc, cadmium does not build up voluminous corrosion products on the surface. This allows for proper functioning during corrosive exposure of moving parts, threaded assemblies, valves, and delicate mechanisms without jamming with debris.

General Information

Status
Historical
Publication Date
09-Feb-2003
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.06 - Soft Metals
Current Stage
Ref Project

Relations

Replaces
ASTM B766-86(1998) - Standard Specification for Electrodeposited Coatings of Cadmium
Effective Date
10-Feb-2003
Replaced By
ASTM B766-86(2008) - Standard Specification for Electrodeposited Coatings of Cadmium
Effective Date
01-Aug-2008
Referred By
ASTM A193/A193M-23 - Standard Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications
Effective Date
10-Feb-2003
Referred By
ASTM A194/A194M-23 - Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
Effective Date
10-Feb-2003
Referred By
ASTM F1387-23 - Standard Specification for Performance of Piping and Tubing Mechanically Attached Fittings
Effective Date
10-Feb-2003
Referred By
ASTM E2112-23 - Standard Practice for Installation of Exterior Windows, Doors and Skylights
Effective Date
10-Feb-2003
Referred By
ASTM F1113-87(2017) - Standard Test Method for Electrochemical Measurement of Diffusible Hydrogen in Steels (Barnacle Electrode)
Effective Date
10-Feb-2003

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ASTM B766-86(2003) - Standard Specification for Electrodeposited Coatings of CadmiumASTM B766-86(2003) - Standard Specification for Electrodeposited Coatings of Cadmium
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ASTM B766-86(2003) - Standard Specification for Electrodeposited Coatings of Cadmium
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Standards Content (Sample)

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: B 766 – 86 (Reapproved 2003)
Standard Specification for
1
Electrodeposited Coatings of Cadmium
This standard is issued under the fixed designation B 766; 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.
1. Scope products on the surface. This allows for proper functioning
during corrosive exposure of moving parts, threaded assem-
1.1 This specification covers the requirements for electrode-
blies, valves, and delicate mechanisms without jamming with
posited cadmium coatings on products of iron, steel, and other
debris.
metals.
NOTE 1—Cadmium is deposited as a coating principally on iron and 2. Referenced Documents
steel products. It can also be electrodeposited on aluminum, brass,
2.1 The following standards form a part of this document to
beryllium copper, copper, nickel, and powder metallurgy parts.
the extent referenced herein.
1.2 The coating is provided in various thicknesses up to and
2.2 ASTM Standards:
including 25 µm either as electrodeposited or with supplemen-
A 165 Specification for Electrodeposited Coatings of Cad-
2
tary finishes.
mium on Steel
3
1.3 Cadmium coatings are used for corrosion resistance and
B 117 Practice for Operating Salt Spray (Fog) Apparatus
for corrosion prevention of the basis metal part. The as-
B 183 Practice for Preparation of Low-Carbon Steel for
4
deposited coating (Type I) is useful for the lowest cost
Electroplating
protection in a mild or noncorrosive environment where early
B 201 Practice for Testing Chromate Coatings on Zinc and
4
formation of white corrosion products is not detrimental or
Cadmium Surfaces
harmful to the function of a component. The prime purpose of
B 242 Practice for Preparation of High-Carbon Steel for
4
the supplementary chromate finishes (Types II and III) on the
Electroplating
electroplated cadmium is to increase corrosion resistance.
B 253 Guide for Preparation ofAluminumAlloys for Elec-
4
Chromating will retard or prevent the formation of white
troplating
corrosionproductsonsurfacesexposedtovariousenvironmen-
B 254 Practice for Preparation of and Electroplating on
4
talconditionsaswellasdelaytheappearanceofcorrosionfrom
Stainless Steel
the basis metal.
B 281 Practice for Preparation of Copper and Copper-Base
4
1.4 Cadmium plating is used to minimize bi-metallic corro-
Alloys for Electroplating and Conversion Coatings
sion between high-strength steel fasteners and aluminum in the
B 320 Practice for Preparation of Iron Castings for Electro-
4
aerospace industry. Undercutting of threads on fastener parts is
plating
4
not necessary as the cadmium coating has a low coefficient of
B 322 Practice for Cleaning Metals Prior to Electroplating
friction that reduces the tightening torque required and allows
B 343 Practice for Preparation of Nickel for Electroplating
4
repetitive dismantling.
with Nickel
4
1.5 Cadmium-coated parts can easily be soldered without
B 374 Terminology Relating to Electroplating
the use of corrosive fluxes. Cadmium-coated steel parts have a
B 487 Test Method for Measurement of Metal and Oxide
lower electrical contact resistance than zinc-coated steel. The
Coating Thicknesses by Microscopical Examination of a
4
lubricity of cadmium plating is used on springs for doors and
Cross Section
latches and for weaving machinery operating in high humidity.
B 499 Test Method for Measurement of Coating Thick-
Corrosion products formed on cadmium are tightly adherent.
nessesbytheMagneticMethod:NonmagneticCoatingson
4
Unlike zinc, cadmium does not build up voluminous corrosion
Magnetic Basis Metals
1
This specification is under the jurisdiction of ASTM Committee B08 on
2
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee Discontinued; see 1987 Annual Book of ASTM Standards, Vol 02.05. Replaced
B08.08.04on Soft Metals. by Specification B 766.
3
Current edition approved Feb. 10, 2003. Published May 2003. Originally Annual Book of ASTM Standards, Vol 03.02.
4
approved in 1986. Last previous edition approved in 1998 as B 766 – 86 (1998). Annual Book of ASTM Standards, Vol 02.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B 766 – 86 (2003)
NOTE 3—It is strongly recommended that production items be pro-
B 504 Test Method for Measurement of Thickness of Me-
4
cessed as either Type II or Type III.
tallic Coatings by the Coulometric Method
B 507 PracticeforDesignofArticlestoBeElectroplatedon
5. Or
...

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

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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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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