INTERNATIONAL ISO STANDARD 12944-4

1 AReference numberISO 12944-4 :1998(E)INTERNATIONALSTANDARDISO1 2944-4 First edition1998-05-15 Paints and varnishes Corrosionprotection of steel structures by protectivepaint systemsPart 4:Types of surface and surface preparationPeintures et vernis Anticorrosion des structures en acier par syst mesde peinture Partie 4: Types de surface et de pr paration de surfaceCOPYRIGHT 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | ---ISO 12944-4 :1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the Organization for StandardizationCase postale 56 CH-1211 Gen ve 20 in SwitzerlandiiContentsPage 1 Scope.

2 1 2 Normative references ..1 3 Definitions ..3 4 General ..4 5 Types of surface to be prepared ..4 6 Surface preparation methods ..5 7 Surface preparation grades ..9 8 Surface profile (roughness) and surface profile grading ..10 9 Assessment of prepared surfaces ..1010 Temporary protection of prepared surfaces from corrosionand/or contamination ..1111 Preparation of temporarily or partly protected surfacesbefore application of further coatings ..1112 Preparation of hot-dip- galvanized surfaces ..1113 Preparation of thermally sprayed metal(zinc and aluminium) surfaces ..1214 Preparation of zinc-electroplated and sherardized surfaces 1215 Preparation of other coated surfaces ..1216 Recommendations regarding pollution and the environment 1317 Health and safety.

3 13 AnnexesAStandard preparation grades for primary (overall) surfacepreparation ..14 BStandard preparation grades for secondary (partial) surfacepreparation ..15 CProcedures for removal of extraneous layers and foreignmatter ..17 COPYRIGHT 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | --- ISOISO 12944-4 :1998(E)iiiDBibliography ..19 EAlphabetical index of terms ..20 COPYRIGHT 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | ---ISO 12944-4 :1998(E) ISOivForewordISO (the INTERNATIONAL Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies).

4 The work ofpreparing INTERNATIONAL Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. INTERNATIONAL organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the INTERNATIONAL Electrotechnical Commission(IEC) on all matters of electrotechnical INTERNATIONAL Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies castinga STANDARD ISO 12944-4 was prepared by Technical CommitteeISO/TC 35, Paints and varnishes, Subcommittee SC 14, Protective paintsystems for steel 12944 consists of the following parts, under the general title Paintsand varnishes Protective paint systems for steel structures: Part 1: General introduction Part 2: Classification of environments Part 3: Design considerations Part 4: Types of surface and surface preparation Part 5: Protective paint systems Part 6: Laboratory performance test methods Part 7: Execution and supervision of paint work Part 8.

5 Development of specifications for new work and maintenanceAnnexes A and B form an integral part of this part of ISO 12944. AnnexesC, D and E are for information 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | --- ISOISO 12944-4 :1998(E)vIntroductionUnprotected steel in the atmosphere, in water and in soil is subject tocorrosion that may lead to damage. Therefore, to avoid corrosion damage,steel structures are normally protected to withstand the corrosion stressesduring the service life required of the are different ways of protecting steel structures from 12944 deals with protection by paint systems and covers, in thevarious parts, all features that are important in achieving adequatecorrosion protection.

6 Additional or other measures are possible but requireparticular agreement between the interested order to ensure effective corrosion protection of steel structures, it isnecessary for owners of such structures, planners, consultants, companiescarrying out corrosion protection work, inspectors of protective coatingsand manufacturers of coating materials to have at their disposal state-of-the-art information in concise form on corrosion protection by paintsystems. Such information has to be as complete as possible,unambiguous and easily understandable to avoid difficulties andmisunderstandings between the parties concerned with the practicalimplementation of protection INTERNATIONAL STANDARD ISO 12944 is intended to give thisinformation in the form of a series of instructions.

7 It is written for those whohave some technical knowledge. It is also assumed that the user ofISO 12944 is familiar with other relevant INTERNATIONAL Standards, inparticular those dealing with surface preparation, as well as relevantnational ISO 12944 does not deal with financial and contractual questions,attention is drawn to the fact that, because of the considerable implicationsof inadequate corrosion protection, non-compliance with requirements andrecommendations given in this STANDARD may result in serious 12944-1 defines the overall scope of all parts of ISO 12944. It givessome basic terms and definitions and a general introduction to the otherparts of ISO 12944.

8 Furthermore, it includes a general statement on health,safety and environmental protection, and guidelines for using ISO 12944for a given part of ISO 12944 describes different types of surface to be protectedand gives information on surface preparation methods such as chemical,mechanical and flame cleaning. It deals with surface preparation grades,surface profile (roughness), assessment of prepared surfaces, temporaryprotection of prepared surfaces, preparation of temporarily protectedsurfaces for further coatings, preparation of existing metal coatings, andenvironmental aspects. As far as possible, reference is made to the basicInternational Standards on the surface preparation of steel substratesbefore application of paints and related 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | ---COPYRIGHT 2002.

9 INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | --- INTERNATIONAL STANDARD ISOISO 12944-4 :1998(E)1 Paints and varnishes Corrosion protection of steel structuresby protective paint systemsPart 4:Types of surface and surface preparation1 ScopeThis part of ISO 12944 deals with the following types of surfaces of steel structures consisting of carbon or low-alloysteel, 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 part of ISO 12944 defines a number of surface preparation grades but does not specify any requirements forthe condition of the substrate prior to surface polished surfaces and work-hardened surfaces are not covered by this part of ISO Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this part ofISO 12944.

10 At the time of publication, the editions indicated were valid. All standards are subject to revision, andparties to agreements based on this part of ISO 12944 are encouraged to investigate the possibility of applying themost recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently validInternational 1461: 1), Hot dip galvanized coatings on fabricated ferrous products 2063:1991, Metallic and other inorganic coatings Thermal spraying Zinc, aluminium and their 2409:1992, Paints and varnishes Cross-cut test. 1) To be published. (Revision of ISO 1459:1973 and ISO 1461:1973)COPYRIGHT 2002; INTERNATIONAL Organization for Standardization Document provided by IHS Licensee=Fluor Corporation/2110503105, User=, 12/15/2002 19:36:10 MST Questions or comments about this message: please callthe Document Policy Management Group at || || | ||| | | || |||| ||||||| | |||| || | ---ISO 12944-4 :1998(E) ISO2 ISO 4628-1:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity,quantity and size of common types of defect Part 1: General principles and rating 4628-2:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity,quantity and size of common types of defect Part 2.