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ASTM D6386-22

(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 with liquid paint and coating products. Preparing surfaces of new and partially weathered galvanized steel for powder coating is addressed in Practice D7803. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Dec-2021
ICS
25.220.10 - Surface preparation
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.46 - Industrial Protective Coatings
Current Stage
Ref Project

Relations

Refers
ASTM D7396-14(2020) - Standard Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
Effective Date
01-Feb-2020

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ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for PaintingASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
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ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
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REDLINE ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for PaintingREDLINE ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
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REDLINE ASTM D6386-22 - Standard Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Painting
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Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6386 − 22
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 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 Thispracticedescribesmethodsofpreparingsurfacesof
new and weathered hot-dip galvanized steel for painting with A123/A123M Specification for Zinc (Hot-Dip Galvanized)
Coatings on Iron and Steel Products
liquid paint and coating products. Preparing surfaces of new
and partially weathered galvanized steel for powder coating is A153/A153M Specification for Zinc Coating (Hot-Dip) on
Iron and Steel Hardware
addressed in Practice D7803. Hot-dip galvanized steel is
produced by the immersion of fabricated or unfabricated A780 Practice for Repair of Damaged and Uncoated Areas
of Hot-Dip Galvanized Coatings
products in a bath of molten zinc, as specified in Specifications
A123/A123M or A153/A153M. This practice covers surface B201 Practice for Testing Chromate Coatings on Zinc and
Cadmium Surfaces
preparation on iron and steel products and hardware that have
not been painted previously. Galvanized surfaces may have D4285 Test Method for Indicating Oil or Water in Com-
pressed Air
been treated with protective coatings to prevent the occurrence
of wet storage stain. This practice does not apply to sheet D6492 Practice for Detection of Hexavalent Chromium On
galvanized steel products nor to the coil coating or continuous Zinc and Zinc/Aluminum Alloy Coated Steel
roller coating processes. Sheet and coil surface preparation can D7091 Practice for Nondestructive Measurement of Dry
be done in accordance with Practice D7396. Film Thickness of Nonmagnetic Coatings Applied to
Ferrous Metals and Nonmagnetic, Nonconductive Coat-
1.2 The values stated in SI units are to be regarded as the
ings Applied to Non-Ferrous Metals
standard. The values given in parentheses are for information
D7396 Guide for Preparation of New, Continuous Zinc-
only.
Coated (Galvanized) Steel Surfaces for Painting
1.3 This standard does not purport to address all of the
D7803 Practice for Preparation of Zinc (Hot-Dip Galva-
safety concerns, if any, associated with its use. It is the
nized) Coated Iron and Steel Product and Hardware
responsibility of the user of this standard to establish appro-
Surfaces for Powder Coating
priate safety, health, and environmental practices and deter-
E376 Practice for Measuring Coating Thickness by
mine the applicability of regulatory limitations prior to use.
Magnetic-Field or Eddy Current (Electromagnetic) Test-
1.4 This international standard was developed in accor-
ing Methods
dance with internationally recognized principles on standard- 3
2.2 SSPC Specifications:
ization established in the Decision on Principles for the
Surface Preparation Specification No. 1 Solvent Cleaning
Development of International Standards, Guides and Recom-
SurfacePreparationSpecificationNo.2 HandToolCleaning
mendations issued by the World Trade Organization Technical
Surface Preparation Specification No. 3 Power Tool Clean-
Barriers to Trade (TBT) Committee.
ing
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 D01.46 on Industrial Protective Coatings. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Jan. 1, 2022. Published February 2022. Originally the ASTM website.
3
approved in 1999. Last previous edition approved in 2016 as D6386 – 16a. DOI: Available from Society for Protective Coatings (SSPC), 40 24th St., 6th Floor,
10.1520/D6386-22. 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 ----------------------
D6386 − 22
Surface Preparation Specification No. 7 Brush-Off Blast previous 48 h. There also should be no visible signs of zinc
Cleaning oxide or zinc hydroxide, which first appear as a fine white
Surface Preparatio
...

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 − 16a D6386 − 22
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*Scope
1.1 This practice describes methods of preparing surfaces of new and weathered hot-dip galvanized steel for painting with liquid
paint and coating products. Preparing surfaces of new and partially weathered galvanized steel for powder coating is addressed in
Practice D7803. 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 safety, health, and healthenvironmental practices and to determine the
applicationapplicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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
D4285 Test Method for Indicating Oil or Water in Compressed Air
D6492 Practice for Detection of Hexavalent Chromium On Zinc and Zinc/Aluminum Alloy Coated Steel
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals
and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
D7396 Guide for Preparation of New, Continuous Zinc-Coated (Galvanized) Steel Surfaces for Painting
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 June 15, 2016Jan. 1, 2022. Published June 2016February 2022. Originally approved in 1999. Last previous edition approved in 2016 as
D6386 – 16.D6386 – 16a. DOI: 10.1520/D6386-16A.10.1520/D6386-22.
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’s Document Summary page on the ASTM website.
*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
1

---------------------- Page: 1 ----------------------
D6386 − 22
D7803 Practice for Preparation of Zinc (Hot-Dip Galvanized) Coated Iron and Steel Product and Hardware Surfaces for Powder
Coating
E376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy Current (Electromagnetic) Testing Methods
3
2.2 Society for Protective Coatings SSPC 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 Sp
...

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ASTM D4940-15(2020)(Test Method)
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4.1 Abrasive media may contain ionic contamination naturally (for example, beach sand), from manufacturing (quenching with contaminated water), transportation, storage or use (in the case of abrasive that is reused). Ionic contamination on the abrasive may transfer to the surface during abrasive blast cleaning, resulting in potential osmotic blistering, accelerated underfilm corrosion and premature coating failure.  
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ABSTRACT
This practice provides an aid for setting up a suitable cleaning cycle preparatory to electroplating of low-carbon steel and indicates some of the precautions that must be taken to maintain this cycle in good operating condition. The preparatory procedure involves three basic steps in the following order: (1) removal of oils, grease, and caked-on dirt; (2) removal of scale and oxide films by pickling; and (3) removal of any smut left on the surface and activation of the steel. The cleaning of racked parts, which shall subsequently be electroplated in still tanks, agitated tanks, and semi- and full-automatic equipment, should be performed following this cycle: (1) precleaning; (2) electrocleaning; (3) water rinse; (4) acid pickling; (5) alkaline descaling; and (6) water rinse. Parts in bulk, which shall subsequently be electroplated in hand-operated or automatic barrels, should follow this cleaning cycle: (1) alkaline cleaning; (2) water rinse; (3) acid pickling; and (4) water rinse.
SCOPE
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SCOPE
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SIGNIFICANCE AND USE
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SCOPE
1.1 This practice is a guide to the surface preparation of plastic materials for decorative and functional electroplating, where the sequence of chemical treatments may include: cleaning, conditioning, etching, neutralizing, catalyzing, accelerating, and autocatalytic metal deposition. Surface preparation also includes electrodeposition of metallic strike coatings immediately after autocatalytic metal deposition. These treatments result in the deposition of thin conductive metal films on the surface of molded-plastic materials, and are described in this practice.  
1.2 Once molded-plastics materials have been made conductive, they may be electroplated with a metal or combination of metals in conventional electroplating solutions. The electroplating solutions and their use are beyond the scope of this practice.  
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. (See Section 4.)  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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