ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
introduction
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ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
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This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 14, Protective Coating Systems for Steel Structures.
The fourth edition cancels and replaces the third edition (ISO 12944-5:2018), which was a minor revision.
Compared with the previous edition, the changes are as follows:
– The original doubled category “G5.02” in Table D.1 is corrected to “G5.02A” and “G5.02b”;
– Correction of table headings in tables B.3 and B.4;
– Some editing changes.
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
A list of all parts in the ISO 12944 series can be found on the ISO website.
Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.
introduce
Unprotected steel in the atmosphere, water and soil can be corroded, potentially causing damage. Therefore, in order to avoid corrosion damage, steel structures are usually protected to withstand corrosion stress during the required service life of the structure.
There are different ways to protect steel structures from corrosion. ISO 12944 (All parts) deals with the protection of coating systems and covers, and in the individual components, all functions are important to achieve adequate corrosion protection. Other measures or other measures may be taken, but require special agreement between the parties concerned.
In order to ensure the effective corrosion protection of steel structures, owners of such structures, planners, consultants, companies performing corrosion protection work, protective coating inspectors and coating material manufacturers need to have new information on the corrosion protection of coating systems. It goes without saying that such information should be as complete, clear and easy to understand as possible in order to avoid difficulties and misunderstandings in the actual implementation of protection work by the parties concerned.
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
ISO 12944 (all parts) aims to provide this information in the form of a series of instructions. It is written for those who have some technical knowledge. It is also assumed that users of ISO 12944 (all parts) are familiar with other relevant international standards, particularly those dealing with surface treatment.
While ISO 12944 (all parts) does not have financial and contractual implications, please be aware of the fact that failure to comply with the requirements and recommendations given in ISO 12944 (all parts) can lead to serious financial consequences due to the large impact of inadequate corrosion protection.
ISO 12944-1 defines the overall scope of ISO 12944. It provides some basic terms and definitions and Outlines the rest of ISO 12944. In addition, it includes a general statement on health, safety and environmental protection, as well as guidance on the use of ISO 12944 (all parts) in specific projects.
This document gives some terms and definitions related to coating systems, combined with guidelines for choosing different types of protective coating systems.
1 Range
This document describes the types of paints and paint systems commonly used for corrosion protection of steel structures.
It also provides guidance for selecting a coating system suitable for different environments (see ISO 12944-2), in addition to the corrosive classes CX and Im4 classes defined in ISO 12944-2 as well as different surface treatment classes (see ISO 12944-4) and expected durability classes (see ISO 12944-1).
2 Normative references
The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.
ISO 1461, hot-dip galvanizing coatings on iron and steel products – Specification and test methods
ISO 2063 (all components), thermal spraying – Zinc, aluminium and their alloys
ISO 2808, Paints and varnishes – Determination of film thickness
ISO 3549, zinc powder pigments for paints – Specifications and test methods
ISO 8501-1, Preparation of steel substrates prior to painting and related products – Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and steel substrates after the overall removal of prior coatings
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
ISO 8503-1, Preparation of steel substrates prior to coating of paints and related products – Surface roughness characteristics of shot blasted clean steel substrates – Part 1: Specification and definition of ISO surface profile comparators for evaluating sandblasted clean surfaces
ISO 12944-1, Paints and varnishes – Corrosion protection of steel structures by protective coating systems – Part 1: General introduction
ISO 12944-2, Paints and varnishes – Corrosion protection of steel structures by protective coating systems – Part 2: Environmental classification
ISO 19840, Paints and varnishes – Corrosion protection of steel structures by protective coating systems – Standard for measurement and acceptance of dry film thickness on rough surfaces
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12944-1 and below apply.
ISO and IEC maintain terminology databases for standardization at the following addresses:
– ISO Online browsing platform: available at iso.org/obp
– IEC electronic encyclopedia: available at electropedia.org/
3.1 Compatibility
< For products in the paint system > The ability of two or more products to be used together as a coating system successfully without causing adverse effects
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
3.2 Primer coat
The first coat of the coating system
3.3 Intermediate Coating
Coat between primer (3.2) and top coat (3.6)
3.4 Tie Jacket
The coating is designed to improve adhesion between coatings
[Source: ISO 4618:2014, 2.262]
3.5 Sealing machine
The coating material is coated on the porous surface before coating to reduce the absorption rate
Note 1: An example of a porous surface is a thermal sprayed metal layer.
3.6 Medium Coating
The final coating of the coating system
3.7 Surface Coating
A paint that has been formulated for use as a primer (3.2) on a prepared surface
3.8 Transition primer
Quick-drying coatings, applied to shot peening to clean steel, provide temporary protection during the manufacturing process while still allowing welding and cutting
[Source: ISO 4618:2014, 2.204, modified – “primer” has been replaced by “paint” and “protect it” has been replaced by “provide temporary protection”.
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
3.9 Dry film thickness DFT
The thickness of the coating that remains on the surface when the coating hardens/cures
3.10 Nominal dry film thickness NDFT
Dry film thickness specified for each coating or the entire coating system (3.9)
3.11 Maximum dry film thickness
The maximum acceptable dry film thickness (3.9), beyond which the performance of the paint or paint system may be compromised
3.12 Application Period
The maximum time that coating materials provided as individual components can be used successfully after being mixed together at any given temperature
ISO 12944.5-2019 Paints and varnishes Protective paint systems for corrosion protection against steel structures – Part 5: Protective paint systems
3.13 Shelf Life
The time the coating material remains in good condition when stored in the original sealed container under normal storage conditions
Note 1: The term “normal storage conditions” is generally understood to mean storage between +5°C and +30°C.
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