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ASTM D6492-99

(Practice)

Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel

Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel

SCOPE
1.1 This practice can be used to detect the presence of hexavalent chromium on galvanized and zinc/aluminum alloy coated steel surfaces. Hexavalent chromium-bearing treatments (passivates) can be applied to coated steels to prevent storage stain. While passivated 55% aluminum-zinc alloy coated steel is commonly painted, passivated galvanized steel is not. Chrome passivation may interfere with the successful pretreatment of galvanized steel, as well as contaminate cleaning and pretreatment baths on a coil coating line.
1.2 The amount of hexavalent chromium that will cause the indicator to produce a discernible pink color is in the range of 0.5 parts per million dissolved in the indicator solution. It is possible that a coated steel surface that produces a negative result does have chromium on the surface. If a material that yields a negative result is suspected of having chromium on the surface, instrumental methods should be used. Chrome deposits of 1 mg/ft2 can be easily missed by analytical instruments such as the scanning electron microscope with energy dispersive x-ray analysis (EDXA) capability. Auger electron spectroscopy (AES) or electron spectroscopy for chemical analysis (ESCA) can identify chemical species present in the levels required for adeqate detection. Stripping the metallic coating and analyzing for chrome by atomic absorption or inductively coupled plasma can also give reliable results in detecting the presence of chrome.
1.3 This practice is designed to be a qualitative means of screening chrome passivated coils from those which are not chrome passivated.
1.4 Some chromium-free passivates are being used commercially. Although these products will test negative for hexavalent chromium, they may interfere with cleaning and pretreating. Chromium bearing passivates that contain film forming constituents such as acrylic resins are also being commercially applied. The reaction of these products to the spot test will vary. Abrading the surface with emery paper will improve the likelihood of reliable detection. This technique is not recommended for acrylic resin containing passivation treatments.
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
09-Dec-1999
ICS
25.220.40 - Metallic coatings
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.53 - Coil Coated Metal
Current Stage
Ref Project

Relations

Replaced By
ASTM D6492-99(2003) - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
Effective Date
01-Dec-2003
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
10-Dec-1999
Referred By
ASTM F1941/F1941M-16 - Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
Effective Date
10-Dec-1999
Referred By
ASTM D7396-14(2020) - Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
Effective Date
10-Dec-1999
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
10-Dec-1999

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ASTM D6492-99 - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated SteelASTM D6492-99 - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
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ASTM D6492-99 - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
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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:D6492–99
Standard Practice for
Detection of Hexavalent Chromium On Zinc and Zinc/
Aluminum Alloy Coated Steel
This standard is issued under the fixed designation D 6492; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope improve the likelihood of reliable detection. This technique is
not recommended for acrylic resin containing passivation
1.1 This practice can be used to detect the presence of
treatments.
hexavalent chromium on galvanized and zinc/aluminum alloy
1.5 This standard does not purport to address all of the
coated steel surfaces. Hexavalent chromium-bearing treat-
safety concerns, if any, associated with its use. It is the
ments (passivates) can be applied to coated steels to prevent
responsibility of the user of this standard to establish appro-
storage stain. While passivated 55 % aluminum-zinc alloy
priate safety and health practices and determine the applica-
coated steel is commonly painted, passivated galvanized steel
bility of regulatory limitations prior to use.
is not. Chrome passivation may interfere with the successful
pretreatment of galvanized steel, as well as contaminate
2. Referenced Documents
cleaning and pretreatment baths on a coil coating line.
2.1 ASTM Standards:
1.2 The amount of hexavalent chromium that will cause the
D 2092 Guide for Treatment of Zinc-coated (Galvanized
indicator to produce a discernible pink color is in the range of
Steel Surfaces) for Painting
0.5 parts per million dissolved in the indicator solution. It is
D 5723 Practice for Determination of Chromium Treatment
possible that a coated steel surface that produces a negative
Weight on Metal Substrates by X-Ray Fluorescence
result does have chromium on the surface. If a material that
yields a negative result is suspected of having chromium on the
3. Apparatus
surface, instrumental methods should be used. Chrome depos-
2 3.1 The following materials will be required to perform the
its of 1 mg/ft can be easily missed by analytical instruments
stripping procedure:
such as the scanning electron microscope with energy disper-
3.1.1 Dark colored or Brown Polyethylene Wash Bottle,
sive x-ray analysis (EDXA) capability. Auger electron spec-
(500 mL) or brown glass dropper bottle.
troscopy (AES) or electron spectroscopy for chemical analysis
3.1.2 TestSpecimens, which may be cut panels or coil stock.
(ESCA) can identify chemical species present in the levels
required for adequate detection. Stripping the metallic coating
4. Reagents
and analyzing for chrome by atomic absorption or inductively
4.1 Thefollowingchemicalreagentsarerequiredtoperform
coupled plasma can also give reliable results in detecting the
this procedure:
presence of chrome.
4.1.1 1,5-Diphenylcarbohydrazide.
1.3 This practice is designed to be a qualitative means of
4.1.2 Acetone.
screening chrome passivated coils from those which are not
4.1.3 Ethanol, 85 %.
chrome passivated.
4.1.4 Phosphoric Acid.
1.4 Some chromium-free passivates are being used com-
4.1.5 Distilled Water.
mercially. Although these products will test negative for
hexavalent chromium, they may interfere with cleaning and
5. Preparation of Indicator Solution
pretreating. Chromium bearing passivates that contain film
5.1 Combine 25 mL acetone with 25 mL ethanol in a
forming constituents such as acrylic resins are also being
suitable container. Add 0.5 g 1,5-diphenylcarbohydrazide and
commercially applied. The reaction of these products to the
allow to dissolve completely. Vigorous agitation may be
spot test will vary.Abrading the surface with emery paper will
required to effect complete dissolution. Slowly a
...

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ASTM D6492-99(2022)(Practice)
Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel

ABSTRACT
This practice can be used for detection of hexavalent chromium on galvanized and zinc/aluminum alloy coated steel surfaces. Hexavalent chromium-bearing treatments (passivates) can be applied to coated steels to prevent storage stain. Chrome passivation may interfere with the successful pretreatment of galvanized steel, as well as contaminate cleaning and pretreatment baths on a coil coating line. This practice is designed to be a qualitative means of screening chrome passivated coils from those which are not chrome passivated. The following materials will be required to perform the stripping procedure: (1) dark colored or brown polyethylene wash bottle, or brown glass dropper bottle, and (2) test specimens which may be cut panels or coil stock. The following chemical reagents are required to perform this procedure: 1,5-diphenylcarbohydrazide, acetone, ethanol, phosphoric acid, and distilled water. The preparation of indicator solution, procedure of detection, and evaluation of pink color development are detailed. If a material that yields a negative result is suspected of having chromium on the surface, instrumental methods should be used. This technique is not recommended for acrylic resin containing passivation treatments.
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1.1 This practice can be used to detect the presence of hexavalent chromium on galvanized and zinc/aluminum alloy coated steel surfaces. Hexavalent chromium-bearing treatments (passivates) can be applied to coated steels to prevent storage stain. While passivated 55 % aluminum-zinc alloy coated steel is commonly painted, passivated galvanized steel is not. Chrome passivation may interfere with the successful pretreatment of galvanized steel, as well as contaminate cleaning and pretreatment baths on a coil coating line.  
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4.1 Different electroplating systems can be corroded under the same conditions for the same length of time. Differences in the average values of the radius or half-width or of penetration into an underlying metal layer are significant measures of the relative corrosion resistance of the systems. Thus, if the pit radii are substantially higher on samples with a given electroplating system, when compared to other systems, a tendency for earlier failure of the former by formation of visible pits is indicated. If penetration into the semi-bright nickel layer is substantially higher, a tendency for earlier failure by corrosion of basis metal is evident.
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20.1 This test method covers determination of the total tin in the sample tested and does not apportion the tin to one or the other side of the test specimen. The calculations appearing in Section 27 assume uniform distribution of tin over the two surfaces.  
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SCOPE
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5.1 Plating/coating Processes—This test method provides a means by which to detect possible hydrogen embrittlement of steel parts during manufacture by verifying strict controls during production operations such as surface preparation, pretreatments, and plating/coating. It is also intended to be used as a qualification test for new plating/coating processes and as a periodic inspection audit for the control of a plating/coating process.  
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SCOPE
1.1 This test method describes mechanical test methods and defines acceptance criteria for coating and plating processes that can cause hydrogen embrittlement in steels. Subsequent exposure to chemicals encountered in service environments, such as fluids, cleaning treatments or maintenance chemicals that come in contact with the plated/coated or bare surface of the steel, can also be evaluated.  
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