ASTM D6386-16
(Practice)Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
SIGNIFICANCE AND USE
4.1 This practice describes the procedures that can be used to prepare new and weathered zinc-coated surfaces on after-fabrication steel products for painting, and that can improve the bond of paint to the zinc surface.
SCOPE
1.1 This practice describes methods of preparing surfaces of new and weathered hot-dip galvanized steel for painting. Hot-dip galvanized steel is produced by the immersion of fabricated or unfabricated products in a bath of molten zinc, as specified in Specifications A123/A123M or A153/A153M. This practice covers surface preparation on iron and steel products and hardware that have not been painted previously. Galvanized surfaces may have been treated with protective coatings to prevent the occurrence of wet storage stain. This practice does not apply to sheet galvanized steel products nor to the coil coating or continuous roller coating processes. Sheet and coil surface preparation can be done in accordance with Practice D7396.
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 to determine the application of regulatory limitations prior to use.
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Designation: D6386 − 16
StandardPractice for
Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and
1
Steel Product and Hardware Surfaces for Painting
This standard is issued under the fixed designation D6386; 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* B201 Practice for Testing Chromate Coatings on Zinc and
Cadmium Surfaces
1.1 Thispracticedescribesmethodsofpreparingsurfacesof
D7396 Guide for Preparation of New, Continuous Zinc-
new and weathered hot-dip galvanized steel for painting.
Coated (Galvanized) Steel Surfaces for Painting
Hot-dip galvanized steel is produced by the immersion of
E376 Practice for Measuring Coating Thickness by
fabricated or unfabricated products in a bath of molten zinc, as
Magnetic-Field or Eddy-Current (Electromagnetic) Test-
specified in Specifications A123/A123M or A153/A153M.
ing Methods
This practice covers surface preparation on iron and steel
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2.2 Society for Protective Coatings Specifications:
products and hardware that have not been painted previously.
Surface Preparation Specification No. 1 Solvent Cleaning
Galvanized surfaces may have been treated with protective
SurfacePreparationSpecificationNo.2 HandToolCleaning
coatings to prevent the occurrence of wet storage stain. This
Surface Preparation Specification No. 3 Power Tool Clean-
practice does not apply to sheet galvanized steel products nor
ing
tothecoilcoatingorcontinuousrollercoatingprocesses.Sheet
Surface Preparation Specification No. 7 Brush-Off Blast
and coil surface preparation can be done in accordance with
Cleaning
Practice D7396.
Surface Preparation Specification No. 11 Power Tool Clean-
1.2 The values stated in SI units are to be regarded as the
ing to Bare Metal
standard. The values given in parentheses are for information
Paint Specification No. 27 Basic Zinc Chromate-Vinyl Bu-
only.
tyral Wash Primer
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3. Summary of Practice
responsibility of the user of this standard to establish appro-
3.1 This practice describes the preparation methods that
priate safety and health practices and to determine the
provide clean and suitable galvanized surfaces for painting,
application of regulatory limitations prior to use.
specifically so that an applied coating system can develop the
adhesion necessary for a satisfactory service life.
2. Referenced Documents
2 3.2 The zinc coating is constantly in a state of change. From
2.1 ASTM Standards:
the time the steel part is removed from the galvanizing kettle,
A123/A123M Specification for Zinc (Hot-Dip Galvanized)
the exposed zinc coating interacts with the environment to
Coatings on Iron and Steel Products
form, first zinc oxides, next zinc hydroxides, and then zinc
A153/A153M Specification for Zinc Coating (Hot-Dip) on
4
carbonates. The process of complete conversion of the outer
Iron and Steel Hardware
layer of zinc carbonates can take up to two years of exposure
A780 Practice for Repair of Damaged and Uncoated Areas
to the environment, depending on the local climatological
of Hot-Dip Galvanized Coatings
conditions. During the first stage, known as newly galvanized
steel, the exposed surface consists mainly of zinc metal with a
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
smallamountofzincoxide.Duringthesecondstage,knownas
Related Coatings, Materials, and Applications and is the direct responsibility of
partially weathered galvanized steel, the exposed surface
Subcommittee D01.46 on Industrial Protective Coatings.
Current edition approved May 1, 2016. Published May 2016. Originally
approved in 1999. Last previous edition approved in 2010 as D6386 – 10. DOI:
3
10.1520/D6386-16. Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Pittsburgh, PA 15222-4656, http://www.sspc.org.
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM This interaction is described in “Duplex Systems,” van Eijnsbergen, J.F.H.,
Standards volume information, refer to the standard’s Document Summary page on Elsevier Science, New York, NY 1994, and in Zinc Handbook, Porter, F., Marcel
the ASTM website. Dekker, Inc., New York, NY 1991.
*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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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: D6386 − 10 D6386 − 16
Standard Practice for
Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and
1
Steel Product and Hardware Surfaces for Painting
This standard is issued under the fixed designation D6386; 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*
1.1 This practice describes methods of preparing surfaces of new and weathered hot-dip galvanized steel for painting. Hot-dip
galvanized steel is produced by the immersion of fabricated or unfabricated products in a bath of molten zinc, as specified in
Specifications A123/A123M or A153/A153M. This practice covers surface preparation on iron and steel products and hardware
that have not been painted previously. Galvanized surfaces may have been treated with protective coatings to prevent the
occurrence of wet storage stain. This practice does not apply to sheet galvanized steel products nor to the coil coating or continuous
roller coating processes. Sheet and coil surface preparation can be done in accordance with Practice D7396.
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 to determine the application of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A123/A123M Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products
A153/A153M Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware
A780 Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings
B201 Practice for Testing Chromate Coatings on Zinc and Cadmium Surfaces
D7396 Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods
3
2.2 Society for Protective Coatings Specifications:
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
Surface Preparation Specification No. 11 Power Tool Cleaning to Bare Metal
Paint Specification No. 27 Basic Zinc Chromate-Vinyl Butyral Wash Primer
3. Summary of Practice
3.1 This practice describes the preparation methods that provide clean and suitable galvanized surfaces for painting, specifically
so that an applied coating system can develop the adhesion necessary for a satisfactory service life.
1
This practice 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 July 1, 2010May 1, 2016. Published July 2010May 2016. Originally approved in 1999. Last previous edition approved in 20052010 as
D6386 – 99 (2005).D6386 – 10. DOI: 10.1520/D6386-10.10.1520/D6386-16.
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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D6386 − 16
3.2 The zinc coating is constantly in a state of change. From the time the steel part is removed from the galvanizing kettle, the
4
exposed zinc coating interacts with the environment to form, first zinc oxides, next zinc hydroxides, and then zinc carbonates. The
process of complete conversion of the outer layer of zinc carbonates can take up to two years of exposure to the environment,
depending on the local climatological co
...
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