This document describes the types of paint and paint system commonly used for corrosion protection of steel structures. It also gives guidelines for the selection of paint systems available for different environments (see ISO 12944-2) except for corrosivity category CX and category Im4 as defined in ISO 12944-2 and different surface preparation grades (see ISO 12944-4), and the durability grade to be expected (see ISO 12944-1).
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This document specifies laboratory test methods and test conditions for the assessment of paint
systems for the corrosion protection of carbon steel structures.
The test results are intended to be considered as an aid in the selection of suitable paint systems and
not as exact information for determining durability.
This document covers protective paint systems designed for application to uncoated steel, hot dip
galvanized steel according to ISO 1461 and steel surfaces with thermal-sprayed metallic coating
according to ISO 2063-1 and ISO 2063-2.
This document does not apply to protective paint systems for electroplated or painted steel.
The environments for corrosivity categories C2 to C5 and Im1 to Im3 defined in ISO 12944-2 are
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ISO 12944-2:2017 deals with the classification of the principal environments to which steel structures are exposed, and the corrosivity of these environments. ISO 12944-2:2017
- defines atmospheric-corrosivity categories, based on mass loss (or thickness loss) by standard specimens, and describes typical natural atmospheric environments to which steel structures are exposed, giving advice on the estimation of the corrosivity,
- describes different categories of environment for structures immersed in water or buried in soil, and
- gives information on some special corrosion stresses that can cause a significant increase in corrosion rate or place higher demands on the performance of the protective paint system.
The corrosion stresses associated with a particular environment or corrosivity category represent one essential parameter governing the selection of protective paint systems.
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This document defines the overall scope of ISO 12944 (all parts). It gives some basic terms and
definitions and a general introduction to the other parts of ISO 12944. Furthermore, it includes a
general statement on health, safety and environmental protection, and guidelines for using ISO 12944
(all parts) for a given project.
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This document deals with the execution and supervision of paint work on steel structures in the
workshop or on site.
This document does not apply to
— the preparation of surfaces to be painted (see ISO 12944-4) and the supervision of such work,
— the application of metallic coatings, and
— pre-treatment methods, such as phosphating and chromating, and paint application methods, such
as dipping, powder coating or coil coating.
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This document covers the following types of surfaces of steel structures consisting of carbon or lowalloy
steel, and their preparation:
— uncoated surfaces;
— surfaces thermally sprayed with zinc, aluminium or their alloys;
— hot-dip-galvanized surfaces;
— zinc-electroplated surfaces;
— sherardized surfaces;
— surfaces painted with prefabrication primer;
— other painted surfaces.
This document defines a number of surface preparation grades but does not specify any requirements
for the condition of the substrate prior to surface preparation.
Highly polished surfaces and work-hardened surfaces are not covered by this document.
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This document deals with the basic criteria for the design of steel structures to be coated by protective
paint systems in order to avoid premature corrosion and degradation of the coating or the structure.
It gives examples of appropriate and inappropriate design, indicating how problems of application,
inspection and maintenance of paint systems can be avoided. Design measures which facilitate handling
and transport of the steel structures are also considered.
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This document covers the development of specifications for corrosion protection of steel structures
using protective paint systems. It relates to new work and maintenance in the workshop or on site
and is also applicable to the corrosion protection of individual components. This document covers
the corrosion protection of steel structures exposed to different corrosion stresses by environments
such as indoors, open-air and immersion in water or burial in soil, as well as special stresses, due for
example, to medium or high temperatures. The need for different durability ranges is considered.
Steel surfaces that have been hot-dip-galvanized, metal-sprayed, zinc-electroplated or sherardized, and
previously painted steel surfaces, are also covered by this document.
In this document, reference areas for assessing the quality of the corrosion protection work and the
performance of the protective paint systems used are dealt with. This document provides detailed
flow charts for planning new work and maintenance, which are taken into account when writing a
This document can also be used as a guide if extreme corrosion stresses or high temperatures occur,
or if the protective paint systems are to be used on other substrates, such as non-ferrous metals or
concrete, to define suitable specifications.
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