ASTM B816-00(2015)

Standard Specification for Coatings of Cadmium-Zinc Mechanically Deposited

ABSTRACT
This specification covers the requirements for cadmium-zinc coatings deposited on metallic products by mechanical deposition. The coating shall be classified in four thickness classes namely, Class 7, Class 12, Class 25, and Class 50. The coating shall also be classified according to coating types defined as Type I, Type IIa, Type IIb, Type IIc, and Type IId. The materials shall be subjected to the following test methods: coating composition determination; thickness measurement; adhesion test; corrosion resistance test; appearance test; and hydrogen embrittlement test.
SIGNIFICANCE AND USE
6.1 Corrosion Resistance, General—This functional coating is used to provide corrosion resistance. The performance of this coating depends largely on its thickness and the kind of environment to which it is exposed. Published results of environmental corrosion studies have demonstrated that the coating provides corrosion resistance greater than equivalent thicknesses of zinc coatings in industrial environments and greater corrosion resistance than equivalent thicknesses of cadmium coatings in marine environments.4  
6.2 Galvanic Corrosion Resistance—The galvanic couple that results in the corrosion of steel and aluminum parts in contact with each other in corrosive environments can also be minimized by plating the steel parts with this mechanically deposited coating.  
6.3 Hydrogen Embrittlement, Absence of—The mechanical coating process does not produce any permanent hydrogen embrittlement in products made from high-strength steels, for example, fasteners or lock washers.
SCOPE
1.1 General—This specification covers the requirements for a coating that is a mixture of cadmium and zinc deposited on metallic products by mechanical deposition. The coating is provided in four thickness classes (see Table 1) and several finish types (see Table 2).    
1.2 Toxicity—Warning: Cadmium is toxic; therefore these coatings should not be used on articles that will contact food or beverages, or for dental and other equipment that may be inserted into the mouth. Also, the coatings should not be used on articles that will be heated to high temperatures, because cadmium will form toxic fumes. Similarly, if coated articles are welded, soldered, or otherwise heated during fabrication, adequate ventilation should be provided to exhaust toxic fumes.  
1.3 Similar Documents—Other kinds of mechanically deposited coatings are covered by Specifications B635, B695, and B696.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 9, of this specification. 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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2015
• ICS: 25.220.40 - Metallic coatings
• Technical Committee: B08 - Metallic and Inorganic Coatings
• Drafting Committee: B08.06 - Soft Metals

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:B816 −00 (Reapproved 2015)
Standard Specification for
1
Coatings of Cadmium-Zinc Mechanically Deposited
This standard is issued under the fixed designation B816; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope B320Practice for Preparation of Iron Castings for Electro-
plating
1.1 General—Thisspecificationcoverstherequirementsfor
B322Guide for Cleaning Metals Prior to Electroplating
a coating that is a mixture of cadmium and zinc deposited on
B374Terminology Relating to Electroplating
metallic products by mechanical deposition. The coating is
B487Test Method for Measurement of Metal and Oxide
provided in four thickness classes (see Table 1) and several
Coating Thickness by Microscopical Examination of
finish types (see Table 2).
Cross Section
1.2 Toxicity—Warning: Cadmium is toxic; therefore these
B499Test Method for Measurement of CoatingThicknesses
coatingsshouldnotbeusedonarticlesthatwillcontactfoodor
by the Magnetic Method: Nonmagnetic Coatings on
beverages, or for dental and other equipment that may be
Magnetic Basis Metals
inserted into the mouth.Also, the coatings should not be used
B571Practice for Qualitative Adhesion Testing of Metallic
on articles that will be heated to high temperatures, because
Coatings
cadmiumwillformtoxicfumes.Similarly,ifcoatedarticlesare
B602Test Method for Attribute Sampling of Metallic and
welded, soldered, or otherwise heated during fabrication,
Inorganic Coatings
adequate ventilation should be provided to exhaust toxic
B635Specification for Coatings of Cadmium-Tin Mechani-
fumes.
cally Deposited
1.3 Similar Documents—Other kinds of mechanically de- B695Specification for Coatings of Zinc Mechanically De-
posited on Iron and Steel
posited coatings are covered by Specifications B635, B695,
and B696. B696Specification for Coatings of Cadmium Mechanically
Deposited
1.4 The following precautionary caveat pertains only to the
B697Guide for Selection of Sampling Plans for Inspection
test method portion, Section 9, of this specification. This
of Electrodeposited Metallic and Inorganic Coatings
standard does not purport to address all of the safety concerns,
B762Test Method of Variables Sampling of Metallic and
if any, associated with its use. It is the responsibility of the user
Inorganic Coatings
of this standard to establish appropriate safety and health
E27Method for Spectrographic Analysis of Zinc and Zinc
practices and determine the applicability of regulatory limita-
3
Alloys by the Solution-Residue Technique
tions prior to use.
E396Test Methods for Chemical Analysis of Cadmium
E536Test Methods for ChemicalAnalysis of Zinc and Zinc
2. Referenced Documents
Alloys
2
2.1 ASTM Standards:
F1470Practice for Fastener Sampling for Specified Me-
B117Practice for Operating Salt Spray (Fog) Apparatus
chanical Properties and Performance Inspection
B183Practice for Preparation of Low-Carbon Steel for
Electroplating
3. Terminology
B242Guide for Preparation of High-Carbon Steel for Elec-
3.1 Definitions—Some of the terms used in this are defined
troplating
in Terminology B374.
4. Classification
1
This specification is under the jurisdiction of ASTM Committee B08 on
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
4.1 Thickness Classes—The coating is classified in four
B08.06 on Soft Metals.
thickness classes, as defined in Table 1.
Current edition approved March 1, 2015. Published April 2015. Originally
approvedin1991.Lastpreviouseditionapprovedin2009asB816–00(2009).DOI:
4.2 Coating Types—The coating is classified by type, as
10.1520/B0816-00R15.
defined in Table 2.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
3
the ASTM website. Withdrawn.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B816−00 (2015)
TABLE 1 Thickness Classes
5.1.6.7 Absence of hydrogen embrittlement, waiting time
Coating prior to testing and testing loads (see 9.8), and
Class Thickness Typical Applications
5.1.7 The sampling plan to be used (see 8.1) and responsi-
Minimum, µm
bility for inspection (see section 13.1).
7 7 Automotive fasteners
12 12 Increased corrosion resistance (for ex-
6. Significance and Use
ample, bellville washers)
25 25 Exterior hardware
6.1 Corrosion Resistance, General—Thisfunctionalcoating
50 50 Pole line hardware in severe envi-
isusedtoprovidecorr
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B816 − 00 (Reapproved 2009) B816 − 00 (Reapproved 2015)
Standard Specification for
1
Coatings of Cadmium-Zinc Mechanically Deposited
This standard is issued under the fixed designation B816; 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
1.1 General—This specification covers the requirements for a coating that is a mixture of cadmium and zinc deposited on
metallic products by mechanical deposition. The coating is provided in four thickness classes (see Table 1) and several finish types
(see Table 2).
1.2 Toxicity—Warning: Cadmium is toxic; therefore these coatings should not be used on articles that will contact food or
beverages, or for dental and other equipment that may be inserted into the mouth. Also, the coatings should not be used on articles
that will be heated to high temperatures, because cadmium will form toxic fumes. Similarly, if coated articles are welded, soldered,
or otherwise heated during fabrication, adequate ventilation should be provided to exhaust toxic fumes.
1.3 Similar Documents—Other kinds of mechanically deposited coatings are covered by Specifications B635, B695, and B696.
1.4 The following precautionary caveat pertains only to the test method portion, Section 9, of this specification.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.
2. Referenced Documents
2
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus
B183 Practice for Preparation of Low-Carbon Steel for Electroplating
B242 Guide for Preparation of High-Carbon Steel for Electroplating
B320 Practice for Preparation of Iron Castings for Electroplating
B322 Guide for Cleaning Metals Prior to Electroplating
B374 Terminology Relating to Electroplating
B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section
B499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis
Metals
B571 Practice for Qualitative Adhesion Testing of Metallic Coatings
B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings
B635 Specification for Coatings of Cadmium-Tin Mechanically Deposited
B695 Specification for Coatings of Zinc Mechanically Deposited on Iron and Steel
B696 Specification for Coatings of Cadmium Mechanically Deposited
B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings
3
E27 Method for Spectrographic Analysis of Zinc and Zinc Alloys by the Solution-Residue Technique
E396 Test Methods for Chemical Analysis of Cadmium
E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
1
This specification is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.06 on Soft
Metals.
Current edition approved Sept. 1, 2009March 1, 2015. Published December 2009April 2015. Originally approved in 1991. Last previous edition approved in 20042009
ε1
as B816 – 00(2004)(2009). . DOI: 10.1520/B0816-00R09.10.1520/B0816-00R15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B816 − 00 (2015)
TABLE 1 Thickness Classes
Coating
Class Thickness Typical Applications
Minimum, μm
7 7 Automotive fasteners
12 12 Increased corrosion resistance (for ex-
ample, bellville washers)
25 25 Exterior hardware
50 50 Pole line hardware in severe envi-
ronments
TABLE 2 Coating Types
Type Description Typical Applications
I As-coated, without supplemen- Lowest cost where white corro-
ary treatments. ion products are
...