ASTM D7396-08
(Guide)Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
SIGNIFICANCE AND USE
This guide describes procedures that can be used to prepare new zinc-coated surfaces for painting and improve the bond of paint to the zinc surface.
SCOPE
1.1 This guide covers surface cleaning and various methods of treating new zinc-coated by the continuous process (galvanized) surfaces produced by either the hot-dip method or by electroplating. This guide covers surfaces that have not been treated previously at the mill to provide temporary protection against staining by moisture other than by easily removed protective oils (see Appendix X1). For preparing surfaces of new or weathered items of zinc-coated steel produced by batch processing, refer to Practice D 6386.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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: D7396 − 08
StandardGuide for
Preparation of New, Continuous Zinc-Coated (Galvanized)
1
Steel Surfaces for Painting
This standard is issued under the fixed designation D7396; 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.
3
1. Scope 2.2 SSPC—The Society for Protective Coatings Standards:
Surface Preparation Specification No. 1 Solvent Cleaning
1.1 This guide covers surface cleaning and various methods
Surface Preparation Specification No. 2 Hand Tool Cleaning
of treating new zinc-coated by the continuous process (galva-
Surface Preparation Specification No. 3 Power Tool Clean-
nized) surfaces produced by either the hot-dip method or by
ing
electroplating. This guide covers surfaces that have not been
Surface Preparation Specification No. 7 Brush-Off Blast
treated previously at the mill to provide temporary protection
Cleaning
against staining by moisture other than by easily removed
Paint Specification No. 27 Basic Zinc Chromate-Vinyl Bu-
protective oils (see Appendix X1). For preparing surfaces of
tyral Wash Primer
new or weathered items of zinc-coated steel produced by batch
processing, refer to Practice D6386.
3. Summary of Guide
1.2 The values stated in SI units are to be regarded as the
3.1 This guide describes surface cleaning and treatment
standard. The values given in parentheses are for information
methods that provide galvanized surfaces suitable for painting,
only.
specifically so that an applied coating system can develop the
1.3 This standard does not purport to address all of the
adhesion necessary for satisfactory service life.
safety concerns, if any, associated with its use. It is the
3.2 Eight methods of treatment (Note 1 and Note 2) are
responsibility of the user of this standard to establish appro-
covered as follows:
priate safety and health practices and determine the applica-
3.2.1 Method A—Zinc Phosphate Treatment.
bility of regulatory limitations prior to use.
3.2.2 Method B—Chromate Treatment.
3.2.3 Method C—Aqueous Chromic-Organic Treatment.
2. Referenced Documents
3.2.4 Method D—Acid-Curing Resinous Treatment.
2
2.1 ASTM Standards:
3.2.5 Method E—Annealing Heat Treatments.
A780 Practice for Repair of Damaged and Uncoated Areas
3.2.6 Method F—Amorphous Complex-Oxide Treatment.
of Hot-Dip Galvanized Coatings
3.2.7 Method G—Abrasive Blast Cleaning.
D4285 Test Method for Indicating Oil or Water in Com-
3.2.8 Method H—Fluro-Titanic/Zirconic Polymer Treat-
pressed Air
ment.
D6386 Practice for Preparation of Zinc (Hot-Dip Galva-
NOTE 1—Materials employed in these methods of treatment are
nized) Coated Iron and Steel Product and Hardware
available from a number of sources as proprietary compounds or methods.
Surfaces for Painting
Selection may be made from available sources.
D6492 Practice for Detection of Hexavalent Chromium On
NOTE 2—The use of solvents containing volatile organic compounds to
Zinc and Zinc/Aluminum Alloy Coated Steel prepare or treat the surface of metal components contributes to air
pollution in the same manner as the use of solvent containing paints and
coatings. The user of this guide must determine the applicability of
appropriate regulations governing the volatile organic compound content
of the materials used in a shop application (Miscellaneous Metal Parts),
field painting (Architectural), or specific process industry.
1
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
3.3 Variationsinsurfacepreparationproduceendconditions
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
that differ and hence do not necessarily yield identical results
Current edition approved June 1, 2008. Published June 2008. Originally
when paints are subsequently applied. Service conditions will
approved in 2007. Last previous edition approved in 2007 as D7396– 07. DOI:
dictate the type of surface preparation to be selected, although
10.1520/D7396-08.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
the ASTM website. Pittsburgh, PA 15222-4656, http://www.sspc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7396 − 08
the quality produced by any individual method may vary with and gre
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
Designation:D7396–07 Designation: D 7396 – 08
Standard Guide for
Preparation of New, Continuous Zinc-Coated (Galvanized)
1
Steel Surfaces for Painting
This standard is issued under the fixed designation D 7396; 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.
1. Scope
1.1 This guide covers surface cleaning and eightvarious methods of treating new zinc-coated by the continuous process
(galvanized) surfaces produced by either the hot-dip method or by electroplating. This guide covers surfaces that have not been
treated previously at the mill to provide temporary protection against staining by moisture other than by easily removed protective
oils (seeAppendix X1). For preparing surfaces of new or weathered items of zinc-coated steel produced by batch processing, refer
to Practice D 6386.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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
2.1 ASTM Standards:
A 780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
D 4285 Test Method for Indicating Oil or Water in Compressed Air
D 6386 Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for
Painting
D 6492 Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
3
2.2 SSPC—The Society for Protective Coatings Standards:
Surface Preparation Specification No. 1 Solvent Cleaning
Surface Preparation Specification No. 2 Hand Tool Cleaning
Surface Preparation Specification No. 3 Power Tool Cleaning
Surface Preparation Specification No. 7 Brush-Off Blast Cleaning
Paint Specification No. 27 Basic Zinc Chromate-Vinyl Butyral Wash Primer
3. Summary of Guide
3.1 This guide describes surface cleaning and treatment methods that provide galvanized surfaces suitable for painting,
specifically so that an applied coating system can develop the adhesion necessary for satisfactory service life.
3.2 Eight methods of treatment (Note 1 and Note 2) are covered as follows:
3.2.1 Method A—Zinc Phosphate Treatment.
3.2.2 Method B—Chromate Treatment.
3.2.3 Method C—Aqueous Chromic-Organic Treatment.
3.2.4 Method D—Acid-Curing Resinous Treatment.
3.2.5 Method E—Annealing Heat Treatments.
3.2.6 Method F—Amorphous Complex-Oxide Treatment.
3.2.7 Method G—Abrasive Blast Cleaning.
1
This guide is under the jurisdiction ofASTM Committee D01 on Paint and Related Coatings, Materials, andApplications and is the direct responsibility of Subcommittee
D01.46 on Industrial Protective Coatings.
Current edition approved Nov. 1, 2007. Published November 2007.
Current edition approved June 1, 2008. Published June 2008. Originally approved in 2007. Last previous edition approved in 2007 as D 7396– 07.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor, Pittsburgh, PA 15222-4656, http://www.sspc.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7396–08
3.2.8 Method H—Fluro-Titanic/Zirconic Polymer Treatment.
NOTE 1—Materials employed in these methods of treatment are available from a number of sources as proprietary compounds or methods. Selection
may be made from available sources.
NOTE 2—The use of solvents containing volatile organic compounds to prepare or treat the surface of metal components contributes to air pollution
in the same manner as the use of solvent containing paints and coatings.The user of this guide must determine the applicability of appropriate regulations
governing the volatile organic compound content of the materials used in a shop applicati
...
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