ASTM B696-00(2009)
(Specification)Standard Specification for Coatings of Cadmium Mechanically Deposited
Standard Specification for Coatings of Cadmium Mechanically Deposited
ABSTRACT
This specification covers the requirements for coating of cadmium mechanically deposited on metal products. Cadmium coatings shall classified on the basis of thickness, as follows: Class 12; Class 8; and Class 5. Cadmium coatings shall be identified as Type I and Type II on the basis of supplementary treatment required. The coating shall be uniform in appearance and free of blisters, pits, nodules, flaking, and other defects that can adversely affect the function of the coating. All steel parts that have ultimate tensile strength and that contains tensile stresses caused by machining, grinding, straightening, or cold-forming operation shall be given a stress relief heat treatment prior to cleaning and metal deposition. The minimum hours to failure (appearance of white corrosion products and red rust for mechanically deposited cadmium coatings on iron and steel) of Type I and Type II coatings shall be indicated to guarantee satisfactory performance. The test specimen shall undergo adhesion, corrosion resistance, and appearance tests. The thickness of the coating shall be determined by the microscopical method, or the magnetic method, or the beta backscatter method, as applicable.
SCOPE
1.1 This specification covers the requirements for a coating of cadmium mechanically deposited on metal products. The coating is provided in various thicknesses up to and including 12 μm.
1.2 Mechanical deposition greatly reduces the risk of hydrogen embrittlement and is suitable for coating bores and recesses in many parts that cannot be conveniently electroplated (see Appendix X3).
1.3 Cadmium coatings are usually applied to provide engineering properties and corrosion resistance. The performance of a cadmium coating depends largely on its thickness and the kind of environment to which it is exposed. Without proof of satisfactory correlation, accelerated tests such as the salt spray (fog) test cannot be relied upon to predict performance in other environments, nor will these serve as comparative measures of the corrosion resistance afforded by coatings of different metals. Thus, although there is a marked superiority of cadmium coatings over zinc coatings of equal thickness in the salt spray test, this is often not the case under conditions of use, so that further testing in the service environment should be conducted.
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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 1.5 and 1.6.
1.5 Warning—Cadmium is toxic and must not be used in a coating for articles that can come into contact with food or beverages, or for dental or other equipment that can be inserted into the mouth. Consult appropriate agencies for regulations in this connection.
1.6 Warning—Because of the toxicity of cadmium vapors and cadmium oxide fumes, cadmium-coated articles must not be used at temperatures of 320°C and above. They must not be welded, spot-welded, soldered, or otherwise strongly heated without adequate ventilation that will efficiently remove all toxic fumes.
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Designation:B696 −00(Reapproved2009)
Standard Specification for
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Coatings of Cadmium Mechanically Deposited
This standard is issued under the fixed designation B696; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope beusedattemperaturesof320°Candabove.Theymustnotbe
welded, spot-welded, soldered, or otherwise strongly heated
1.1 This specification covers the requirements for a coating
without adequate ventilation that will efficiently remove all
of cadmium mechanically deposited on metal products. The
toxic fumes.
coating is provided in various thicknesses up to and including
12 µm.
2. Referenced Documents
1.2 Mechanical deposition greatly reduces the risk of hy-
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2.1 ASTM Standards:
drogen embrittlement and is suitable for coating bores and
B117Practice for Operating Salt Spray (Fog) Apparatus
recesses in many parts that cannot be conveniently electro-
B183Practice for Preparation of Low-Carbon Steel for
plated (see Appendix X3).
Electroplating
1.3 Cadmium coatings are usually applied to provide engi-
B242Guide for Preparation of High-Carbon Steel for Elec-
neering properties and corrosion resistance. The performance
troplating
of a cadmium coating depends largely on its thickness and the
B322Guide for Cleaning Metals Prior to Electroplating
kind of environment to which it is exposed. Without proof of
B487Test Method for Measurement of Metal and Oxide
satisfactory correlation, accelerated tests such as the salt spray
Coating Thickness by Microscopical Examination of
(fog)testcannotbereliedupontopredictperformanceinother
Cross Section
environments, nor will these serve as comparative measures of
B499Test Method for Measurement of CoatingThicknesses
the corrosion resistance afforded by coatings of different
by the Magnetic Method: Nonmagnetic Coatings on
metals. Thus, although there is a marked superiority of cad-
Magnetic Basis Metals
mium coatings over zinc coatings of equal thickness in the salt
B567Test Method for Measurement of Coating Thickness
spray test, this is often not the case under conditions of use, so
by the Beta Backscatter Method
that further testing in the service environment should be
B602Test Method for Attribute Sampling of Metallic and
conducted.
Inorganic Coatings
1.4 This standard does not purport to address all of the B697Guide for Selection of Sampling Plans for Inspection
of Electrodeposited Metallic and Inorganic Coatings
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- B762Test Method of Variables Sampling of Metallic and
Inorganic Coatings
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For specific F1470Practice for Fastener Sampling for Specified Me-
chanical Properties and Performance Inspection
precautionary statements, see 1.5 and 1.6.
1.5 Warning—Cadmium is toxic and must not be used in a
3. Classification
coating for articles that can come into contact with food or
beverages,orfordentalorotherequipmentthatcanbeinserted
3.1 Classes—Cadmium coatings are classified on the basis
into the mouth. Consult appropriate agencies for regulations in
of thickness, as follows:
this connection.
Class Minimum Thickness, µm
12 12
1.6 Warning—Because of the toxicity of cadmium vapors
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and cadmium oxide fumes, cadmium-coated articles must not
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This specification is under the jurisdiction of ASTM Committee B08 on
Metallic and Inorganic Coatingsand is the direct responsibility of Subcommittee
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B08.06 on Soft Metals. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2009. Published December 2009. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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approved in 1981. Last previous edition approved in 2004 as B696–00(2004) . Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0696-00R09. the ASTM website.
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B696−00(2009)
3.2 Types—Cadmiumcoatingsareidentifiedbytypesonthe 6.2.2 High-strength steels that have heavy oxide or scale
basis of supplementary treatment required, as follows: shallbecleanedbeforeapplicationofthecoatinginaccordance
Type I—As coated without supplementary chromate treat- with Practice B242. In general, nonelectrolytic alkaline,
ment (Appendix X2.1)
...
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