ISO 147131-1-2017 Guidance and recommendations on corrosion resistance of iron and steel in galvanized structures – Part 1: General principles for design and corrosion resistance

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ISO 147131-1-2017 Guidance and recommendations on corrosion resistance of iron and steel in galvanized structures – Part 1: General principles for design and corrosion resistance

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This document has been 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 17668 has replaced EN 13811;

— Revise Table 1 to be consistent 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 advice on general design principles applicable to articles to be galvanised against corrosion and the level of resistance provided by the galvanised coating of iron and steel articles exposed to a variety of environments. Initial protection involves

— Standard processes available,

— Design considerations, and

— Use environment.

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

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

b) Hot-dip galvanized coating (for continuous sheet);

c) zincizing coating;

d) Thermal spraying layer;

e) mechanical coating;

f) electrodeposition coating.

These guidelines and recommendations do not address the protection of galvanized steel against corrosion 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 impose specific requirements on the galvanizing system applied, which go beyond any general guidelines presented in this document. These product-specific requirements will take precedence over these general recommendations.

2 Normative reference files
ISO 1461, Hot dip galvanized 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 deposition 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 databases of terms for standardization at the following addresses:

— IEC Electropedia: available at

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3.1 Atmospheric corrosion

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

[Source: ISO 8044:2015, 3.4]

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 requirements on corrosion protection systems

3.4 Life to 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 the protection of the base metal

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