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ASTM D6492-99(2003)

(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

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.
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 adequate 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 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.6 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
30-Nov-2003
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

Replaces
ASTM D6492-99 - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
Effective Date
01-Dec-2003
Replaced By
ASTM D6492-99(2011) - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
Effective Date
01-Nov-2011
Referred By
ASTM F1941/F1941M-16 - Standard Specification for Electrodeposited Coatings on Mechanical Fasteners, Inch and Metric
Effective Date
01-Dec-2003
Referred By
ASTM D3794-22 - Standard Guide for Testing Coil Coatings
Effective Date
01-Dec-2003
Referred By
ASTM D7396-14(2020) - Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
Effective Date
01-Dec-2003
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-Dec-2003

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ASTM D6492-99(2003) - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated SteelASTM D6492-99(2003) - Standard Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
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ASTM D6492-99(2003) - 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(Reapproved2003)
Standard Practice for
Detection of Hexavalent Chromium On Zinc and Zinc/
Aluminum Alloy Coated Steel
This standard is issued under the fixed designation D6492; 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 spot test will vary.Abrading the surface with emery paper will
improve the likelihood of reliable detection. This technique is
1.1 This practice can be used to detect the presence of
not recommended for acrylic resin containing passivation
hexavalent chromium on galvanized and zinc/aluminum alloy
treatments.
coated steel surfaces. Hexavalent chromium-bearing treat-
1.5 The values stated in SI units are to be regarded as the
ments (passivates) can be applied to coated steels to prevent
standard. The values given in parentheses are for information
storage stain. While passivated 55 % aluminum-zinc alloy
only.
coated steel is commonly painted, passivated galvanized steel
1.6 This standard does not purport to address all of the
is not. Chrome passivation may interfere with the successful
safety concerns, if any, associated with its use. It is the
pretreatment of galvanized steel, as well as contaminate
responsibility of the user of this standard to establish appro-
cleaning and pretreatment baths on a coil coating line.
priate safety and health practices and determine the applica-
1.2 The amount of hexavalent chromium that will cause the
bility of regulatory limitations prior to use.
indicator to produce a discernible pink color is in the range of
0.5 parts per million dissolved in the indicator solution. It is
2. Referenced Documents
possible that a coated steel surface that produces a negative
2.1 ASTM Standards:
result does have chromium on the surface. If a material that
D2092 Guide for Preparation of Zinc-Coated (Galvanized)
yieldsanegativeresultissuspectedofhavingchromiumonthe
Steel Surfaces for Painting
surface, instrumental methods should be used. Chrome depos-
D5723 Practice for Determination of Chromium Treatment
its of 1 mg/ft can be easily missed by analytical instruments
Weight on Metal Substrates by X-Ray Fluorescence
such as the scanning electron microscope with energy disper-
sive x-ray analysis (EDXA) capability. Auger electron spec-
3. Apparatus
troscopy (AES) or electron spectroscopy for chemical analysis
3.1 The following materials will be required to perform the
(ESCA) can identify chemical species present in the levels
stripping procedure:
required for adequate detection. Stripping the metallic coating
3.1.1 Dark colored or Brown Polyethylene Wash Bottle,
and analyzing for chrome by atomic absorption or inductively
(500 mL) or brown glass dropper bottle.
coupled plasma can also give reliable results in detecting the
3.1.2 TestSpecimens, which may be cut panels or coil stock.
presence of chrome.
1.3 This practice is designed to be a qualitative means of
4. Reagents
screening chrome passivated coils from those which are not
4.1 Thefollowingchemicalreagentsarerequiredtoperform
chrome passivated.
this procedure:
1.4 Some chromium-free passivates are being used com-
4.1.1 1,5-Diphenylcarbohydrazide.
mercially. Although these products will test negative for
4.1.2 Acetone.
hexavalent chromium, they may interfere with cleaning and
4.1.3 Ethanol, 85 %.
pretreating. Chromium bearing passivates that contain film
4.1.4 Phosphoric Acid.
forming constituents such as acrylic resins are also being
4.1.5 Distilled Water.
commercially applied. The reaction of these products to the
1 2
This practice is under the jurisdiction of ASTM Committee D01 on Paint and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Related Coatings, Materials, and Applications and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D01.5
...

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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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1.1 This test method gives two procedures for measuring the force required to peel a metallic coating from a plastic substrate.2 One procedure (Procedure A) utilizes a universal testing machine and yields reproducible measurements that can be used in research and development, in quality control and product acceptance, in the description of material and process characteristics, and in communications. The other procedure (Procedure B) utilizes an indicating force instrument that is less accurate and that is sensitive to operator technique. It is suitable for process control use.  
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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.  
20.2 This test method does not differentiate between free tin on the tinplate surface, tin combined with iron in the intermediate alloy layer, or tin alloyed with the steel as a residual tramp element.
SCOPE
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1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments

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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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1.5.1 The loading conditions and pass/fail requirements for service environments are specified in Annex A5.  
1.5.2 If approved by the cognizant engineering authority, a quantitative, accelerated (≤ 24 h) incremental step-load (ISL) test as defined in Annex A3 may be used as an alternative to SLT.  
1.6 This test method is divided into two parts. The first part gives general information concerning requirements for hydrogen embrittlement testing. The second is composed of annexes that give specific requirements for the various loading and specimen configurations covered by this test method (see section 9.1 for a list of types) and the details for testing service environments.  
1.7 The values stated in the foot-pound-second (fps) system in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conv...

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    English language
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