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ASTM B994/B994M-15

(Specification)

Standard Specification for Nickel-Cobalt Alloy Coating

Standard Specification for Nickel-Cobalt Alloy Coating

ABSTRACT
This specification outlines the requirements for corrosion-resistant coatings of electrodeposited nickel-cobalt on metallic substrates and electrodeposited nickel-cobalt used for electroforming. It includes an accelerated exposure test method to evaluate the effects of corrosion and galling on the nickel-cobalt alloy coating, as well as a means of reporting the results to the purchaser.
This specification incorporates a classification scheme that establishes service condition by thickness, classes of deposits based on the level of monitoring, and type based on supplemental coatings used after deposition. It also provides requirements for materials and manufacture; acceptance tests in terms of appearance, adhesion, and coating thickness, qualification tests (galling test, chemical composition, hydrogen embrittlement test, corrosion testing, environmental testing, third party reports, frequency of qualification tests); sampling; rejection; and certification.
SCOPE
1.1 This specification describes the requirements for corrosion-resistant coatings of electrodeposited nickel-cobalt on metallic substrates and electrodeposited nickel-cobalt used for electroforming.
Note 1: The nickel-cobalt alloy is principally deposited as a coating on steel products. It can also be electrodeposited on iron, stainless steel, aluminum, titanium and any other metal substrate.
Note 2: The nickel-cobalt alloy coating has a low coefficient of friction of 0.08 that provides a dry lubricant on part surfaces that are in contact with each other and are subject to galling.  
1.2 This specification incorporates an accelerated exposure test method to evaluate the effects of corrosion and galling on the coating, and incorporates a means of reporting the results to the purchaser.  
1.3 The specification incorporates a classification scheme that establishes service conditions for thickness, classes of deposits based on the level of monitoring, and type based on supplemental coatings used after deposition.  
1.4 The coating thickness ranges from 5 to >30 μm, and it can be applied to machined parts, springs, latches, threaded parts, fasteners, etc. The deposit can also be used to electroform parts requiring high strength with the alloy being maintained at 50% nickel-cobalt.  
1.5 The nickel-cobalt alloy is used to protect ferrous metals in contact with corrosive environments such as: oil and gas production facilities, costal marine, and ACQ (Alkaline Copper Quaternary) treatments for wood treatments.  
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.7 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.  
1.8 This standard has been revised to comply with the Restriction of Hazardous Substances RoHS Requirements that seek to limit the exposure of workers and the public to toxic metals. The nickel-cobalt alloy does not contain any of the six Restricted Hazardous Substances.

General Information

Status
Historical
Publication Date
28-Feb-2015
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.03 - Engineering Coatings
Current Stage
Ref Project

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ASTM B994/B994M-15 - Standard Specification for Nickel-Cobalt Alloy CoatingASTM B994/B994M-15 - Standard Specification for Nickel-Cobalt Alloy Coating
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ASTM B994/B994M-15 - Standard Specification for Nickel-Cobalt Alloy Coating
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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: B994/B994M −15
Standard Specification for
1
Nickel-Cobalt Alloy Coating
This standard is issued under the fixed designation B994/B994M; 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 priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This specification describes the requirements for
1.8 This standard has been revised to comply with the
corrosion-resistant coatings of electrodeposited nickel-cobalt
Restriction of Hazardous SubstancesRoHSRequirements that
on metallic substrates and electrodeposited nickel-cobalt used
seek to limit the exposure of workers and the public to toxic
for electroforming.
metals. The nickel-cobalt alloy does not contain any of the six
NOTE 1—The nickel-cobalt alloy is principally deposited as a coating
Restricted Hazardous Substances.
on steel products. It can also be electrodeposited on iron, stainless steel,
aluminum, titanium and any other metal substrate.
2. Referenced Documents
NOTE 2—The nickel-cobalt alloy coating has a low coefficient of
2
2.1 ASTM Standards:
friction of 0.08 that provides a dry lubricant on part surfaces that are in
contact with each other and are subject to galling. A193/A193M Specification for Alloy-Steel and Stainless
Steel Bolting for High Temperature or High Pressure
1.2 This specification incorporates an accelerated exposure
Service and Other Special Purpose Applications
test method to evaluate the effects of corrosion and galling on
A194/A194M Specification for Carbon andAlloy Steel Nuts
thecoating,andincorporatesameansofreportingtheresultsto
for Bolts for High Pressure or High Temperature Service,
the purchaser.
or Both
1.3 The specification incorporates a classification scheme
A681 Specification for Tool Steels Alloy
that establishes service conditions for thickness, classes of
B117 Practice for Operating Salt Spray (Fog) Apparatus
deposits based on the level of monitoring, and type based on
B183 Practice for Preparation of Low-Carbon Steel for
supplemental coatings used after deposition.
Electroplating
1.4 The coating thickness ranges from 5 to >30 µm, and it
B242 Guide for Preparation of High-Carbon Steel for Elec-
can be applied to machined parts, springs, latches, threaded troplating
parts, fasteners, etc. The deposit can also be used to electro-
B254 Practice for Preparation of and Electroplating on
form parts requiring high strength with the alloy being main-
Stainless Steel
tained at 50% nickel-cobalt. B320 Practice for Preparation of Iron Castings for Electro-
plating
1.5 The nickel-cobalt alloy is used to protect ferrous metals
B322 Guide for Cleaning Metals Prior to Electroplating
in contact with corrosive environments such as: oil and gas
B368 Test Method for Copper-Accelerated Acetic Acid-Salt
productionfacilities,costalmarine,andACQ(AlkalineCopper
Spray (Fog) Testing (CASS Test)
Quaternary) treatments for wood treatments.
B374 Terminology Relating to Electroplating
1.6 The values stated in either SI units or inch-pound units
B568 Test Method for Measurement of Coating Thickness
are to be regarded separately as standard. The values stated in
by X-Ray Spectrometry
each system may not be exact equivalents; therefore, each
B571 Practice for Qualitative Adhesion Testing of Metallic
system shall be used independently of the other. Combining
Coatings
values from the two systems may result in non-conformance
B602 Test Method for Attribute Sampling of Metallic and
with the standard.
Inorganic Coatings
1.7 This standard does not purport to address all of the
B697 Guide for Selection of Sampling Plans for Inspection
safety concerns, if any, associated with its use. It is the
of Electrodeposited Metallic and Inorganic Coatings
responsibility of the user of this standard to establish appro-
B762 Test Method of Variables Sampling of Metallic and
Inorganic Coatings
1
ThistestmethodisunderthejurisdictionofASTMCommitteeB08onMetallic
2
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.03 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Engineering Coatings. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved March 1, 2015. Published March 2015. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
B0994_B0994M–15. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B994/B994M − 15
B849 Specifica
...

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1.2.1 Hardness, strength, and ductility,  
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