UNE-EN ISO 12944-1:2018

1.1ISO 12944 deals with the corrosion protection of steel structures by protective paint systems.

1.2ISO 12944 covers only the corrosion-protective function of paint systems. Other protective functions, like the protection against:

¾ðmicroorganisms (marine fouling, bacteria, fungi, etc.),

¾ðchemicals (acids, alkalis, organic solvents, gases, etc.),

¾ðmechanical action (abrasion, etc.) and

¾ðfire

are not covered by ISO 12944.

1.3The field of application is characterized by:

¾ðthe type of structure,

¾ðthe type of surface and surface preparation,

¾ðthe type of environment,

¾ðthe type of protective paint system,

¾ðthe type of work and

¾ðthe durability of the protective paint system.

Although ISO 12944 does not cover all types of structure, surface and surface preparation, it may, by agreement, also be applied to those cases which are not covered by the standard.

The various aspects of the field of application are described in more detail in 1.3.1 to 1.3.6.

1.3.1Type of structure

ISO 12944 concerns structures made of carbon or low-alloy steel (e.g. in accordance with EN 10025) of not less than 3 mm thickness, which are designed using an approved strength calculation.

Not covered by ISO 12944 are concrete structures reinforced with steel.

1.3.2Type of surface and surface preparation

ISO 12944 deals with the following types of surface consisting of carbon or low-alloy steel, and their preparation:

¾ðuncoated surfaces;

¾ðsurfaces thermally sprayed with zinc, aluminium or their alloys;

¾ðhot-dip-galvanized surfaces;

¾ðzinc-electroplated surfaces;

¾ðsherardized surfaces;

¾ðsurfaces painted with prefabrication primer;

¾ðother painted surfaces.

1.3.3Type of environment

ISO 12944 deals with:

¾ðsix corrosivity categories for atmospheric environments,

¾ðthree categories for structures immersed in water or buried in soil,

¾ðspecial cases.

1.3.4Type of protective paint system

ISO 12944 covers a range of paint products which dry or cure at ambient conditions. Not covered by ISO 12944 are:

¾ðpowder coating materials,

¾ðstoving enamels,

¾ðheat-cured paints,

¾ðcoatings of more than 2 mm dry-film thickness,

¾ðlinings of tanks,

¾ðproducts for the chemical treatment of surfaces (e.g. phosphating solutions).

1.3.5Type of work

ISO 12944 covers both new work and maintenance.

1.3.6Durability of the protective paint system

ISO 12944 considers four different durability ranges (low, medium, high, very high). See 3.5 and Clause 4.

The durability range is not a guarantee time .