A Preface
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ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

This document has been prepared by Technical Committee ISO/TC 107, Metallic and other Inorganic Coatings, Sub-Committee SC 4, Hot-dipped Coatings (galvanizing etc.) in cooperation with Technical Committee CEN/TC 262 of the European Committee for Standardization (CEN), Metallic and other inorganic Coatings, According to the Technical cooperation agreement between ISO and CEN (Vienna Agreement).

The fourth edition eliminates and replaces the third edition (ISO 1461:2009), which has been technically revised.

The main changes are as follows:

— Added definitions of “galvanizing”, “post-treatment”, “additional coating”, “wet storage stain” and “dual phase system” in Chapter 3;

-The difficulty of removing flux residues and zinc ash when access is restricted is recognized in 6.1;

– The selection procedure for reference areas has been clarified, and additional requirements have been added in ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

6.2.3 to avoid the use of reference areas on certain small auxiliary components on larger items;

– Modification of the retrofit requirements for uncoated areas: removal of the requirement for zinc-containing paint pigments to comply with ISO 3549; Annex C has been extended to include additional information regarding the suitability of the different renovation methods given in 6.3;

— All requirements related to coating thickness, including Tables 3 and 4, have been placed in 6.5, including requirements related to item size in control samples previously in 6.2.3; The lower coating thickness that results in ultra-low reactivity steels is recognized in the new requirements for these steel grades in 6.5;

– Updated information on the corrosion resistance of galvanized coatings, including long-term corrosion resistance in reference to ISO 9224 in Appendix E.

Any feedback or questions on this document should be directed to the user’s national standards body. A full list of these agencies can be found at iso.org/members.html.

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

1 Scope of application
This document specifies the general properties of hot dip galvanized coatings and test methods for hot dip galvanized coatings applied by immersing iron and steel products (including certain castings) in a zinc melt with no more than 2% other metal content. This document does not apply to:

a) continuous hot dip galvanized sheet, wire and braided or welded mesh products;

b) Hot-dip galvanized pipes in automation equipment;

c) Hot-dip galvanized products (such as fasteners) for which specific standards exist and may include additional requirements or requirements different from those of this document.

Note: Individual product standards can be incorporated into this document by referring to the number of the galvanized coating, or they can be combined with product-specific modifications. Different requirements can also be placed on galvanized coatings on products designed to meet specific regulatory requirements.

This document does not apply to post-treatment or additional coating of hot dip galvanized products.

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

2 Normative reference documents
When the following documents are referred to in the text, part or all of their contents constitute the requirements of this document. For dated references, only the cited version applies. For undated citations, the new version of the citation document (including any revisions) applies.

ISO 752, zinc ingots

ISO 1460, Metallic coatings — Hot dip galvanized coatings on ferrous metallic materials — Gravimetric determination of mass per unit area

ISO 2064, Metallic and other inorganic coatings – Definitions and conventions for thickness measurement

ISO 2178, non-magnetic coatings on magnetic substrates – Measurement of coating thickness – magnetic method

ISO 2859-1, Sampling procedures for inspection by attributes – Part 1: Sampling scheme for acceptance quality limit (AQL) index by lot inspection

ISO 2859-2, Sampling procedures for inspection by attribute-Part 2: Sampling plans indexed by restricted quality (LQ) for isolation of batch inspection

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

ISO 2859-3, Sampling procedures for inspection by attributes — Part 3: Sampling procedures for skip batches

ISO 10474, Steel and steel products-Inspection documentation

ISO 14713-2:2019, Zinc coatings — Guidelines and recommendations for corrosion protection of steel in structures — Part 2: Hot dip galvanizing

EN 1179, Zinc and zinc alloys — Primary zinc

EN 13283, Zinc and zinc alloys — Recycled zinc

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2064 and the following shall apply.

ISO and IEC maintain terminology databases for standardization at the following addresses:

– ISO online browsing platform: iso.org/obp

– IEC Electropedia: available at electropedia.org

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

3.1 Hot dip galvanizing

To form a galvanized coating of zinc or zinc-iron alloys or both on finished iron or steel products by immersion in a zinc melt (3.16)

3.2 Hot dip galvanized coating

Galvanized coating

The coating obtained by intermittent hot dip galvanizing (3.1)

3.3 Electroplating machine

A company or organization dealing in hot dip galvanized (3.1) batch steel products

3.4 Galvanized coating

Total mass of zinc or zinc alloy per surface area, or both

Note 1: The quality of galvanized coating is expressed in grams per square meter, g/m 2.

3.5 Thickness of galvanized coating

The total thickness of zinc or zinc alloys, or both

Note 1: The thickness is expressed in micrometers µm.

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

3.6 Salient aspect

A part of an article covered or to be covered by a galvanized coating and the galvanized coating is required for the use of performance or appearance or both

3.7 Control samples

Items or groups of items were selected from batches for sampling

3.8 Reference Area

An area where a specific number of single measurements are taken

3.9 Thickness of local galvanized layer

The average of the galvanized coating thickness (3.5) is a single value of the magnetic test or weight test obtained from a specific number of measurements within the reference area (3.8)

3.10 Average galvanized layer thickness

Average thickness of local galvanized layer (3.9)

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

3.11 Local galvanizing layer

Quality value of galvanized coating obtained from a single weight test (3.4)

3.12 Average galvanized coating quality

The average of the galvanized coating quality (3.4) determined by using a control sample (3.7) or by conversion of the average galvanized coating thickness (3.10)

Entry Note 1: Control samples should be selected using ISO 1460 compliant tests in accordance with Chapter 5.

3.13 Inspection batch

Single order or single delivery load

3.14 Acceptance

Inspection lot (3.13) at hot Dip galvanizing (3.1) plant unless otherwise specified

3.15 Uncoated area

The area on a steel product that does not react with molten zinc

3.16 Zinc melt

A molten substance containing mainly zinc

ISO 1461-2022 “Hot dip galvanized coatings on steel products – Specifications and test methods”

3.17 Weld leakage

Discharge of a previously retained pretreatment solution from a narrow space between two closely contacting surfaces of a batch weld or from a very small cavity (pinhole) in the weld of a galvanized product

3.18 After treatment

Immediate application of chemical or other treatments that have a temporary effect, such as inhibiting wet storage stains (3.20) or enhancing the appearance of galvanized products

3.19 Additional coating

Application of a galvanized post-coating as part of a dual-phase system (3.21), e.g. liquid coating or powder coating

3.20 Wet storage of stains

Surface stains caused by the formation of zinc corrosion products, usually zinc hydroxide and zinc oxide, when newly galvanized steel is stored or transported under humid or wet conditions

3.21 Duplex system

Hot dip galvanized coating (3.2) with additional liquid coating or powder coating

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