Introduction
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ISO/IEC Directive Part 1 describes the procedures used to develop this document as well as those used for further maintenance. In particular, attention should be paid to the different approval criteria required for different types of ISO files. This document has been drafted in accordance with the editorial rules of ISO/IEC Directive Part 2 (see iso.org/directives).

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

Explanations of the relevant standards of voluntary, ISO specific terms related to conformity assessment and the expression of meaning, and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please refer to the iso.org/iso/foreword.html.

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

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

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

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 restricted access is recognized in 6.1;

– The reference area selection procedure has been clarified and additional requirements have been added in 6.2.3 to avoid the use of reference areas on certain small auxiliary components on larger items;

— Modified refurbishment requirements for uncoated areas: removed the requirement for zinc-containing paint pigments to comply with ISO 3549; Annex C has been extended to include additional information on the applicability of the different refurbishment 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 the dimensions of items previously in the control sample in 6.2.3; The new requirements for these steels in 6.5 recognize the lower coating thickness that results in ultra-low reactivity steels;

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

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

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

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 steel products (including certain castings) in a zinc melt (containing no more than 2% of other metals). 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 in this document.

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

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

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

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

ISO 752, zinc ingot

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 property – Part 1: Sampling scheme for the acceptance quality limit (AQL) index for batch inspection

ISO 2859-2, Sampling procedures for testing by property – Part 2: Sampling plans indexed by restricted quality (LQ) for testing of isolated batches

ISO 2859-3, sampling procedures for testing by property – Part 3: Sampling procedures for skipping batches

ISO 10474, Steel and steel products – inspection documents

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

EN 1179, Zinc and zinc alloys — primary zinc

EN 13283, Zinc and zinc alloys — Recycled zinc

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

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

ISO and IEC maintain terminology databases for standardization at:

– ISO online browsing platform: iso.org/obp

– IEC Electropedia: available at electropedia.org

3.1 Hot dip galvanizing

To form a galvanized coating of zinc or zinc-iron alloys or both on fabricated iron or steel products by immersion of 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

Hot dip galvanized (3.1) batch steel products company or organization

3.4 Galvanized layer

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 layer

Total thickness of zinc or zinc alloy, or both

Remark 1: The thickness is expressed in micrometer µm.

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

3.6 Salient surface

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

3.7 Control samples

Select items or groups of items from the batch for sampling

3.8 Reference Area

An area where a specific number of single measurements are made

3.9 Thickness of local galvanized layer

The average galvanized coating thickness (3.5) is a single value from a magnetic test or a 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 coating (3.9)

3.11 Local galvanizing layer

Galvanized layer quality value obtained from a single weight test (3.4)

3.12 Average galvanized coating quality

Average 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 according to Chapter 5 using tests conforming to ISO 1460.

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

3.13 Inspection batch

Single order or single delivery load

3.14 Acceptance

Inspection batch (3.13) at hot dip galvanizing (3.1) factory unless otherwise specified

3.15 Uncoated area

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

3.16 Zinc melt

A molten substance containing chiefly zinc

3.17 Weld leakage

Discharge the previously reserved pretreatment solution from a narrow space between two closely contacting surfaces of intermittent welding 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 galvanized post-coating as part of a duplex system (3.21), such as liquid coating or powder coating

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

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 wet or damp conditions

3.21 Duplex systems

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

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