introduction
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ISO 147131-2017 “Guidelines and recommendations for corrosion protection of steels in galvanised structures – Part 1: General principles for design and corrosion resistance”

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This document was prepared by Technical Committee ISO/TC 107, Metal and Other Inorganic Coatings, Sub-Committee SC 4, Hot-Dip Coatings (Galvanizing, etc.).

This second edition cancels and replaces the first edition (ISO 14713-1:2009), which is a minor revision following the publication of ISO 17668:2016 and ISO 9223:2012, with the following changes:

ISO 147131-2017 “Guidelines and recommendations for corrosion protection of steels in galvanised structures – Part 1: General principles for design and corrosion resistance”

ISO 17668 has replaced EN 13811.

Revise Table 1 to align with the corresponding description of typical environments in Table C.1 of ISO 9223:2012 and to make it more clear that the corrosion rates provided are for the first year of exposure.

A list of all the parts in the ISO 14713 series can be found on the ISO website.

1 Scope of Application
This document provides guidance and recommendations on general design principles applicable to articles to be galvanised against corrosion and the level of corrosion resistance provided by the galvanised coating of steel articles exposed to a variety of environments. Initial protection involves

— Standard processes available,

— Design considerations, and

— Use the environment.

ISO 147131-2017 “Guidelines and recommendations for corrosion protection of steels in galvanised structures – Part 1: General principles for design and corrosion resistance”

This document applies to zinc coatings applied by the following processes:

a) Hot-dip galvanizing coating (post-manufacturing application);

b) Hot-dip galvanizing coating (applied to continuous plates);

c) zincizing coating;

d) Thermal spraying layer;

e) mechanical coating;

f) electrodeposition coating.

These guidelines and recommendations do not address anti-corrosion maintenance of galvanized steel in use. Guidance on this topic can be found in ISO 12944-5 and ISO 12944-8.

Note: There are a variety of product-related standards (e.g., nails, fasteners, ductile iron pipes, etc.) that place specific requirements on the galvanizing system being applied that go beyond any general guidelines presented in this document. These specific product-related requirements will take precedence over these general recommendations.

ISO 147131-2017 “Guidelines and recommendations for corrosion protection of steels in galvanised structures – Part 1: General principles for design and corrosion resistance”

2 Normative reference documents
ISO 1461, hot-dip galvanizing coatings on iron and steel products – Specification and test methods

ISO 2063, Thermal spraying – Metallic and other inorganic coatings – zinc, aluminium and their alloys

ISO 2064, Metallic and other Inorganic Coatings – Definitions and conventions for thickness measurement

ISO 8044:2015, Corrosion of metals and alloys – basic terms and definitions

ISO 12683, Mechanical deposited coatings of zinc – Specification and test methods

ISO 17668, Zinc diffused coatings on ferrous metal products – zincizing – Specification

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1461, ISO 2063, ISO 2064, ISO 8044, ISO 12683 and ISO 17668 and the following apply.

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

– IEC Electropedia: available at electropedia.org/

– ISO online browsing platform iso.org/obp

3.1 Atmospheric corrosion

Corrosion with the Earth’s atmosphere at ambient temperatures is called a corrosive environment

[Source: ISO 8044:2015, 3.4]

ISO 147131-2017 “Guidelines and recommendations for corrosion protection of steels in galvanised structures – Part 1: General principles for design and corrosion resistance”

3.2 High Temperature

The temperature between +60 °C and +200 °C

3.3 Special Exposure

Special cases, such as exposure, can significantly exacerbate corrosion exposure and/or place higher demands on corrosion protection systems

3.4 Life to the first maintenance

The amount of time that can pass after the initial coating before the coating deteriorates to the point where maintenance is required to restore protection to the base metal

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