ISO 12944-4:2017
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 4: Types of surface and surface preparation
ISO 12944-4:2017 covers the following types of surfaces of steel structures consisting of carbon or low-alloy 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.
ISO 12944-4:2017 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 ISO 12944-4:2017.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Types of surface to be prepared
5.1 General
5.2 Uncoated surfaces
5.3 Metal-coated surfaces
5.3.1 Thermally sprayed surfaces
5.3.2 Hot-dip-galvanized surfaces
5.3.3 Zinc-electroplated surfaces
5.3.4 Sherardized surfaces
5.4 Surfaces painted with prefabrication primer
5.5 Other painted surfaces
5.6 Surfaces with chemical treatment
6 Surface preparation methods
6.1 General
6.2 Water, solvent and chemical cleaning
6.2.1 Water cleaning
6.2.2 Steam cleaning
6.2.3 Emulsion cleaning
6.2.4 Alkaline cleaning
6.2.5 Organic-solvent cleaning
6.2.6 Stripping
6.2.7 Acid pickling
6.2.8 Chemical treatment
6.3 Mechanical cleaning
6.3.1 Hand-tool cleaning
6.3.2 Power-tool cleaning
6.3.3 Blast-cleaning
6.3.4 Water jetting
7 Surface preparation grades
7.1 General
7.2 Uncoated surfaces
7.3 Metal-coated surfaces
7.4 Surfaces painted with prefabrication primer
7.5 Other painted surfaces
8 Surface profile (roughness) and surface profile grading
9 Assessment of prepared surfaces
10 Temporary protection of prepared surfaces from corrosion and/or contamination
11 Preparation of temporarily or partly protected surfaces before application of further coatings
12 Preparation of hot-dip-galvanized surfaces
12.1 Unweathered surfaces
12.2 Weathered surfaces
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces
14 Preparation of zinc-electroplated and sherardized surfaces
15 Preparation of other coated surfaces
16 Recommendations regarding pollution and the environment
17 Health and safety
Annex A (normative) Standard preparation grades for primary (overall) surface preparation
Annex B (normative) Standard preparation grades for secondary (partial) surface preparation
Annex C (informative) Procedures for removal of extraneous layers and foreign matter, native layers and contaminants
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Types of surface to be prepared
5.1 General
5.2 Uncoated surfaces
5.3 Metal-coated surfaces
5.3.1 Thermally sprayed surfaces
5.3.2 Hot-dip-galvanized surfaces
5.3.3 Zinc-electroplated surfaces
5.3.4 Sherardized surfaces
5.4 Surfaces painted with prefabrication primer
5.5 Other painted surfaces
5.6 Surfaces with chemical treatment
6 Surface preparation methods
6.1 General
6.2 Water, solvent and chemical cleaning
6.2.1 Water cleaning
6.2.2 Steam cleaning
6.2.3 Emulsion cleaning
6.2.4 Alkaline cleaning
6.2.5 Organic-solvent cleaning
6.2.6 Stripping
6.2.7 Acid pickling
6.2.8 Chemical treatment
6.3 Mechanical cleaning
6.3.1 Hand-tool cleaning
6.3.2 Power-tool cleaning
6.3.3 Blast-cleaning
6.3.4 Water jetting
7 Surface preparation grades
7.1 General
7.2 Uncoated surfaces
7.3 Metal-coated surfaces
7.4 Surfaces painted with prefabrication primer
7.5 Other painted surfaces
8 Surface profile (roughness) and surface profile grading
9 Assessment of prepared surfaces
10 Temporary protection of prepared surfaces from corrosion and/or contamination
11 Preparation of temporarily or partly protected surfaces before application of further coatings
12 Preparation of hot-dip-galvanized surfaces
12.1 Unweathered surfaces
12.2 Weathered surfaces
13 Preparation of thermally sprayed metal (zinc and aluminium) surfaces
14 Preparation of zinc-electroplated and sherardized surfaces
15 Preparation of other coated surfaces
16 Recommendations regarding pollution and the environment
17 Health and safety
Annex A (normative) Standard preparation grades for primary (overall) surface preparation
Annex B (normative) Standard preparation grades for secondary (partial) surface preparation
Annex C (informative) Procedures for removal of extraneous layers and foreign matter, native layers and contaminants
Bibliography