ASTM D7396-14
(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
4.1 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 for treating new, continuous zinc-coated (galvanized) steel surfaces produced by either the hot-dip method or by electroplating. This guide is applicable to only surface preparation for application of liquid paint and coating products, and not for powder coating applications. 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 D6386.
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 − 14
Standard Guide 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
for treating new, continuous zinc-coated (galvanized) steel
Surface Preparation Specification No. 3 Power Tool Clean-
surfaces produced by either the hot-dip method or by electro-
ing
plating.This guide is applicable to only surface preparation for
Surface Preparation Specification No. 16 Brush-Off Blast
application of liquid paint and coating products, and not for
Cleaning of Coated and Uncoated Galvanized Steel,
powder coating applications. This guide covers surfaces that
Stainless Steel, and Non-Ferrous Metals
have not been treated previously at the mill to provide
Paint Specification No. 27 Basic Zinc Chromate-Vinyl Bu-
temporaryprotectionagainststainingbymoistureotherthanby
tyral Wash Primer
easily removed protective oils (see Appendix X1). For prepar-
ing surfaces of new or weathered items of zinc-coated steel
3. Summary of Guide
produced by batch processing, refer to Practice D6386.
3.1 This guide describes surface cleaning and treatment
1.2 The values stated in SI units are to be regarded as the
methods that provide galvanized surfaces suitable for painting,
standard. The values given in parentheses are for information
specifically so that an applied coating system can develop the
only.
adhesion necessary for satisfactory service life.
1.3 This standard does not purport to address all of the
3.2 Eight methods of treatment (Note 1 and Note 2) are
safety concerns, if any, associated with its use. It is the
covered as follows:
responsibility of the user of this standard to establish appro-
3.2.1 Method A—Zinc Phosphate Treatment.
priate safety and health practices and determine the applica-
3.2.2 Method B—Chromate Treatment.
bility of regulatory limitations prior to use.
3.2.3 Method C—Aqueous Chromic-Organic Treatment.
3.2.4 Method D—Acid-Curing Resinous Treatment.
2. Referenced Documents
3.2.5 Method E—Annealing Heat Treatments.
2
2.1 ASTM Standards:
3.2.6 Method F—Amorphous Complex-Oxide Treatment.
A780 Practice for Repair of Damaged and Uncoated Areas
3.2.7 Method G—Abrasive Blast Cleaning.
of Hot-Dip Galvanized Coatings
3.2.8 Method H—Fluro-Titanic/Zirconic Polymer Treat-
D4285 Test Method for Indicating Oil or Water in Com-
ment.
pressed Air
NOTE 1—Materials employed in these methods of treatment are
D6386 Practice for Preparation of Zinc (Hot-Dip Galva-
available from a number of sources as proprietary compounds or methods.
nized) Coated Iron and Steel Product and Hardware
Selection may be made from available sources.
Surfaces for Painting
NOTE 2—The use of solvents containing volatile organic compounds to
D6492 Practice for Detection of Hexavalent Chromium On
prepare or treat the surface of metal components contributes to air
pollution in the same manner as the use of solvent containing paints and
Zinc and Zinc/Aluminum Alloy Coated Steel
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),
1
This guide is under the jurisdiction of ASTM Committee D01 on Paint and
field painting (Architectural), or specific process industry.
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.46 on Industrial Protective Coatings.
3.3 Variationsinsurfacepreparationproduceendconditions
Current edition approved Dec. 1, 2014. Published January 2015. Originally
that differ and hence do not necessarily yield identical results
approved in 2007. Last previous edition approved in 2008 as D7396– 08. DOI:
when paints are subsequently applied. Service conditions will
10.1520/D7396-14.
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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International,
...
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.
Designation: D7396 − 08 D7396 − 14
Standard Guide 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.
1. Scope Scope*
1.1 This guide covers surface cleaning and various methods offor treating new zinc-coated by the continuous process
(galvanized) new, continuous zinc-coated (galvanized) steel surfaces produced by either the hot-dip method or by electroplating.
This guide is applicable to only surface preparation for application of liquid paint and coating products, and not for powder coating
applications. 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 D6386.
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:
A780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
D4285 Test Method for Indicating Oil or Water in Compressed Air
D6386 Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
D6492 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. 716 Brush-Off Blast Cleaning of Coated and Uncoated Galvanized Steel, Stainless Steel,
and Non-Ferrous Metals
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.
1
This guide is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of Subcommittee
D01.46 on Industrial Protective Coatings.
Current edition approved June 1, 2008Dec. 1, 2014. Published June 2008January 2015. Originally approved in 2007. Last previous edition approved in 20072008 as
D7396– 07.– 08. DOI: 10.1520/D7396-08.10.1520/D7396-14.
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 Standards
volume information, refer to the standard’sstandard’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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7396 − 14
3.2.6 Method F—Amorphous Complex-Oxide Treatment.
3.2.7 Method G—Abrasive Blast Cleaning.
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 co
...
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