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ASTM B201-80(2009)e1

(Practice)

Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces

Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces

SIGNIFICANCE AND USE
This practice is applicable to chromate coatings of the colorless (both one and two-dip), iridescent yellow or bronze, olive drab, black, colorless anodic, yellow or black anodic types, and of the dyed variety, when applied to surfaces of electrodeposited zinc, mechanically deposited zinc, hot-dipped zinc, rolled zinc, electrodeposited cadmium, mechanically deposited cadmium, and zinc die castings.
Note 1—Colorless coatings are also referred to as clear-bright or blue-bright coatings.
Because of variables inherent in the salt-spray test, which may differ from one test cabinet to another, interpretation of test results for compliance with expected performance should be specified by the purchaser.
Properties such as thickness, color, luster, and ability to provide good paint adhesion are not covered in this practice, nor are the chemical composition and the method of application of these finishes.
SCOPE
1.1 This practice covers a procedure for evaluating the protective value of chemical and electrochemical conversion coatings produced by chromate treatments of zinc and cadmium surfaces.
1.2 The protective value of a chromate coating is usually determined by salt-spray test and by determining whether or not the coating possesses adequate abrasion resistance.
1.3 Other methods, such as exposure to a humidity environment, can be used, but are generally of too long a duration to be of practical value. “Steam Tests” using pressure cookers have also been used for testing chromate films on hot-dip galvanized surfaces.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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
31-Aug-2009
ICS
25.220.40 - Metallic coatings
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B201-80(2004) - Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
Effective Date
01-Sep-2009
Replaced By
ASTM B201-80(2014) - Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
Effective Date
01-Nov-2014
Referred By
ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
Effective Date
01-Sep-2009
Referred By
ASTM B699-86(2021)e1 - Standard Specification for Coatings of Cadmium Vacuum-Deposited on Iron and Steel
Effective Date
01-Sep-2009
Referred By
ASTM B635-00(2023) - Standard Specification for Coatings of Cadmium-Tin Mechanically Deposited
Effective Date
01-Sep-2009
Referred By
ASTM B766-23 - Standard Specification for Electrodeposited Coatings of Cadmium
Effective Date
01-Sep-2009
Referred By
ASTM B633-23 - Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel
Effective Date
01-Sep-2009
Referred By
ASTM D7803-19 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Powder Coating
Effective Date
01-Sep-2009

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ASTM B201-80(2009)e1 - Standard Practice for Testing Chromate Coatings on Zinc and Cadmium SurfacesASTM B201-80(2009)e1 - Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
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ASTM B201-80(2009)e1 - Standard Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
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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
´1
Designation: B201 − 80 (Reapproved2009) Endorsed by American
Electroplaters’ Society
Endorsed by National
Association of Metal Finishers
Standard Practice for
Testing Chromate Coatings on Zinc and Cadmium Surfaces
This standard is issued under the fixed designation B201; 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 Department of Defense.
´ NOTE—The units statement in subsection (1.4) was inserted editorially in January 2010.
1. Scope 3.1.1 time to failure—time to failure will depend on the type
of coating tested. A list of some expected protective values
1.1 This practice covers a procedure for evaluating the
obtainable in a given salt spray test is shown in Appendix X2.
protective value of chemical and electrochemical conversion
3.1.1.1 Discussion—In most instances, failure is defined as
coatings produced by chromate treatments of zinc and cad-
the first appearance on significant surfaces of white corrosion
mium surfaces.
products visible to the unaided eye at normal reading distance,
1.2 The protective value of a chromate coating is usually
except that the presence of white corrosion products at sharp
determined by salt-spray test and by determining whether or
edges (for example, on threaded fasteners) and at junctions
not the coating possesses adequate abrasion resistance.
between dissimilar metals should not be considered failure. In
1.3 Other methods, such as exposure to a humidity
some instances, it may be desirable to regard the first appear-
environment, can be used, but are generally of too long a
ance of red rust as failure.
duration to be of practical value. “Steam Tests” using pressure
3.1.2 significant surfaces—in general, significant surfaces
cookers have also been used for testing chromate films on
are those surfaces that are visible and subject to corrosion or
hot-dip galvanized surfaces.
wear, or both, except that surfaces that are normally difficult to
1.4 The values stated in SI units are to be regarded as
coat by electroplating or mechanical deposition may be ex-
standard. No other units of measurement are included in this
empt. The designation of significant surfaces may be indicated
standard.
on the drawing.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Significance and Use
responsibility of the user of this standard to establish appro-
4.1 This practice is applicable to chromate coatings of the
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. colorless (both one and two-dip), iridescent yellow or bronze,
olive drab, black, colorless anodic, yellow or black anodic
2. Referenced Documents
types, and of the dyed variety, when applied to surfaces of
electrodeposited zinc, mechanically deposited zinc, hot-dipped
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus zinc, rolled zinc, electrodeposited cadmium, mechanically
deposited cadmium, and zinc die castings.
3. Terminology
NOTE 1—Colorless coatings are also referred to as clear-bright or
3.1 Definitions of Terms Specific to This Standard:
blue-bright coatings.
4.2 Because of variables inherent in the salt-spray test,
This practice is under the jurisdiction of ASTM Committee B08 on Metallic
which may differ from one test cabinet to another, interpreta-
and Inorganic Coatingsand is the direct responsibility of Subcommittee B08.07 on
tion of test results for compliance with expected performance
Conversion Coatings.
Current edition approved Sept. 1, 2009. Published January 2009. Originally
should be specified by the purchaser.
approved in 1945. Last previous edition approved in 2004 as B201 – 80 (2004).
DOI: 10.1520/B0201-80R09E01.
4.3 Properties such as thickness, color, luster, and ability to
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
provide good paint adhesion are not covered in this practice,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
nor are the chemical composition and the method of applica-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tion of these finishes.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
´1
B201 − 80 (2009)
5. Conditioning (about 70 kPa (10 psi)) and a stroke approximately 50 mm
long. The chromate coating should not be removed or worn
5.1 Aging—Before subjecting a chromate coating to test, it
through to the underlying metal as a result of this treatment.
must be aged at room temperature in a clean environment for
at least 24 h after the chromating treatment. 6.3 Test for Colorless (Clear) Coatings—This test applies
only to coatings that are free of secondary supplementary
5.2 Preparation of Specimen—The test surface must be free
coatings, such as oil, water or solvent-based polymers, or wax.
of fingerprints and other extraneous stains and must not be
6.3.1 Determine the presence of a colorless (clear) coating
cleaned except by gentle wiping with a clean, dry, soft cloth to
byplacingadropofleadacetatetestingsolutiononthesurface.
remove loose particles. Oily or greasy surfaces should not be
Allow the drop to remain on the surface for 5 s. Remove the
used for testing, and degreasing with organic solvents is not
testing solution by blotting gently, taking care not to disturb
recommended.
anydepositthatmayhavefor
...

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Approximate Hardness (HK25)  
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4.1 The thickness of a metal coating is often critical to its performance.  
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SCOPE
1.1 This guide covers the use of the dropping test to measure the thickness of electrodeposited zinc, cadmium, copper, and tin coatings.  
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