ASTM B201-80(2014)
(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
4.1 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.
4.2 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.
4.3 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.
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Designation: B201 − 80 (Reapproved 2014) 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 U.S. Department of Defense.
1. Scope 3. Terminology
1.1 This practice covers a procedure for evaluating the 3.1 Definitions of Terms Specific to This Standard:
protective value of chemical and electrochemical conversion
3.1.1 time to failure—time to failure will depend on the type
coatings produced by chromate treatments of zinc and cad-
of coating tested. A list of some expected protective values
mium surfaces.
obtainable in a given salt spray test is shown in Appendix X2.
3.1.1.1 Discussion—In most instances, failure is defined as
1.2 The protective value of a chromate coating is usually
the first appearance on significant surfaces of white corrosion
determined by salt-spray test and by determining whether or
products visible to the unaided eye at normal reading distance,
not the coating possesses adequate abrasion resistance.
except that the presence of white corrosion products at sharp
1.3 Other methods, such as exposure to a humidity
edges (for example, on threaded fasteners) and at junctions
environment, can be used, but are generally of too long a
between dissimilar metals should not be considered failure. In
duration to be of practical value. “Steam Tests” using pressure
some instances, it may be desirable to regard the first appear-
cookers have also been used for testing chromate films on
ance of red rust as failure.
hot-dip galvanized surfaces.
3.1.2 significant surfaces—in general, significant surfaces
1.4 The values stated in SI units are to be regarded as
are those surfaces that are visible and subject to corrosion or
standard. No other units of measurement are included in this
wear, or both, except that surfaces that are normally difficult to
standard.
coat by electroplating or mechanical deposition may be ex-
1.5 This standard does not purport to address all of the
empt. The designation of significant surfaces may be indicated
safety concerns, if any, associated with its use. It is the
on the drawing.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 This practice is applicable to chromate coatings of the
2. Referenced Documents colorless (both one and two-dip), iridescent yellow or bronze,
2 olive drab, black, colorless anodic, yellow or black anodic
2.1 ASTM Standards:
types, and of the dyed variety, when applied to surfaces of
B117 Practice for Operating Salt Spray (Fog) Apparatus
electrodeposited zinc, mechanically deposited zinc, hot-dipped
zinc, rolled zinc, electrodeposited cadmium, mechanically
This practice is under the jurisdiction of ASTM Committee B08 on Metallic
deposited cadmium, and zinc die castings.
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.07 on
Conversion Coatings.
NOTE 1—Colorless coatings are also referred to as clear-bright or
Current edition approved Nov. 1, 2014. Published November 2014. Originally
blue-bright coatings.
ε1
approved in 1945. Last previous edition approved in 2009 as B201 – 80 (2009) .
DOI: 10.1520/B0201-80R14.
4.2 Because of variables inherent in the salt-spray test,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
which may differ from one test cabinet to another, interpreta-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
tion of test results for compliance with expected performance
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. should be specified by the purchaser.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B201 − 80 (2014)
4.3 Properties such as thickness, color, luster, and ability to thechromatedsurfacewithagritless,softgumeraser(art-gum)
provide good paint adhesion are not covered in this practice, for2to3sby hand (about ten strokes) using normal pressure
nor are the chemical composition and the method of applica- (about 70 kPa (10 psi)) and a stroke approximately 50 mm
tion of these finishes. long. The chromate coating should not be removed or worn
through to the underlying metal as a result of this treatment.
5. Conditioning
6.3 Test for Colorless (Clear) Coatings—This test applies
5.1 Aging—Before subjecting a chromate coating to test, it
only to coatings that are free of secondary supplementary
must be aged at room temperature in a clean environment for
coatings, such as oil, water or solvent-based polymers, or wax.
at least 24 h after the chromating treatment.
6.3.1 Determine the presence of a colorless (clear) coating
5.2 Preparation of Specimen—The test surface must be free
byplacingadropofleadacetatetestingsolutiononthesurface.
of fingerprints and other extraneous stains and must not be
Allow the drop to remain on the surface for 5 s. Remove the
cleaned except by gentle wiping with a clean, dry, soft cloth to
testing solution by blotting gently, taking care not to disturb
remove loose particles. Oily or greasy surfaces should not be
anydepositthatmayhaveformed.Adarkdepositorblackstain
used for tes
...
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.
´1
Designation: B201 − 80 (Reapproved 2009) B201 − 80 (Reapproved 2014) 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 U.S. Department of Defense.
ε NOTE—The units statement in subsection (1.4) was inserted editorially in January 2010.
1. 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.
2. Referenced Documents
2.1 ASTM Standards:
B117 Practice for Operating Salt Spray (Fog) Apparatus
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 time to failure—time to failure will depend on the type of coating tested. A list of some expected protective values
obtainable in a given salt spray test is shown in Appendix X2.
This practice is under the jurisdiction of ASTM Committee B08 on Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee B08.07 on
Conversion Coatings.
Current edition approved Sept. 1, 2009Nov. 1, 2014. Published January 2009November 2014. Originally approved in 1945. Last previous edition approved in 20042009
ε1
as B201 – 80 (2004).(2009) . DOI: 10.1520/B0201-80R09E01.10.1520/B0201-80R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3.1.1.1 Discussion—
In most instances, failure is defined as the first appearance on significant surfaces of white corrosion products visible to the unaided
eye at normal reading distance, except that the presence of white corrosion products at sharp edges (for example, on threaded
fasteners) and at junctions between dissimilar metals should not be considered failure. In some instances, it may be desirable to
regard the first appearance of red rust as failure.
3.1.2 significant surfaces—in general, significant surfaces are those surfaces that are visible and subject to corrosion or wear,
or both, except that surfaces that are normally difficult to coat by electroplating or mechanical deposition may be exempt. The
designation of significant surfaces may be indicated on the drawing.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B201 − 80 (2014)
4. Significance and Use
4.1 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.
4.2 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.
4.3 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.
5. Conditioning
5.1 Aging—Before subjecting a chromate coating to test, it must be aged at room temperature in a clean environment for at least
24 h after the chromating treatment.
5.2 Preparation of Specimen—The test surface must be free of fingerprints and other extraneous stains and must not be cleaned
except by gentle wiping with a clean, dry, soft cloth to remove loose particles. Oily or greasy surfaces should not be used for
testing, and degreasing with organic solvents is not recommended.
6. Procedure
6.1 Salt Spray Test—Expose the clean specimen to a 5 % solution salt spray and conduct the test in accordance with the latest
revision of Practice B117. Unless otherwise specified, only those surfaces that are positioned in the test chamber in accordance
with Practice B117 are considered pertinent for evaluating failure.
6.2 Abrasion Resistance Test—To determine whether the coating is adherent, nonpowdery, and abrasion resistant, rub the
chromated surface with a gritless, soft gum eraser (a
...
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