BS-EN-ISO-12944-4-1998.pdf

BRITISH STANDARD BS EN ISO 12944-4:1998 Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 4: Types of surface and surface preparation The European Standard EN ISO 12944-4:1998 has the status of a British Standard ICS 87.020; 91.080.10 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 12944-4:1998 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 November 1998 © BSI 05-1999 ISBN 0 580 30347 0 National foreword This British Standard is the English language version of EN ISO 12944-4:1998. It is identical with ISO 12944-4:1998. Together with the other seven parts of BS EN ISO 12944, it partially supersedes BS 5493:1977 which is declared obsolescent. The UK participation in its preparation was entrusted to Technical Committee STI/27, Paint systems for metallic substrates, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, page 2, the ISO title page, pages ii to iv, pages 1 to 18 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 12944-4:1998 © BSI 05-1999i Contents Page National forewordInside front cover Foreword2 Forewordiii Text of ISO 12944-41 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 12944-4 May 1998 ICS 87.020 Descriptors: See ISO document English version Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 4: Types of surface and surface preparation (ISO 12944-4:1998) Peintures et vernis Anticorrosion des structures en acier par systèmes de peinture Partie 4: Types de surface et de préparation de surfaces (ISO 12944-4:1998) Beschichtungsstoffe Korrosionsschutz von Stahlbauten durch Beschichtungssysteme Teil 4: Arten von Oberflächen und Oberflächenvorbereitung (ISO 12944-4:1998) This European Standard was approved by CEN on 16 June 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12944-4:1998 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 12944-4:1998 © BSI 05-1999 2 Foreword The text of the International Standard ISO 12944-4:1998 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1998, and conflicting national standards shall be withdrawn at the latest by November 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 12944-4:1998 was approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative). Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 12944-4:1998 ii © BSI 05-1999 Contents Page Forewordiii Introduction1 1Scope1 2Normative references1 3Definitions3 4General4 5Types of surface to be prepared4 6Surface preparation methods4 7Surface preparation grades7 8Surface profile (roughness) and surface profile grading8 9Assessment of prepared surfaces8 10Temporary protection of prepared surfaces from corrosion and/or contamination8 11Preparation of temporarily or partly protected surfaces before application of further coatings8 12Preparation of hot-dip-galvanized surfaces9 13Preparation of thermally sprayed metal (zinc and aluminium) surfaces9 14Preparation of zinc-electroplated and sherardized surfaces9 15Preparation of other coated surfaces9 16Recommendations regarding pollution and the environment10 17Health and safety10 Annex A (normative) Standard preparation grades for primary (overall) surface preparation11 Annex B (normative) Standard preparation grades for secondary (partial) surface preparation12 Annex C (informative) Procedures for removal of extraneous layers and foreign matter14 Annex D (informative) Bibliography15 Annex E (informative) Alphabetical index of terms16 Annex ZA (normative) Normative references to international publications with their relevant European publications17 Descriptors: Paints, varnishes, steel construction, corrosion, corrosion prevention, protective coatings, surface condition, surface treatment. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 12944-4:1998 © BSI 05-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 12944-4 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 14, Protective paint systems for steel structures. ISO 12944 consists of the following parts, under the general title Paints and 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: Development of specifications for new work and maintenance. Annex A and Annex B form an integral part of this part of ISO 12944. Annex C, Annex D and Annex E are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 12944-4:1998 © BSI 05-19991 Introduction Unprotected steel in the atmosphere, in water and in soil is subject to corrosion that may lead to damage. Therefore, to avoid corrosion damage, steel structures are normally protected to withstand the corrosion stresses during the service life required of the structure. There are different ways of protecting steel structures from corrosion. ISO 12944 deals with protection by paint systems and covers, in the various parts, all features that are important in achieving adequate corrosion protection. Additional or other measures are possible but require particular agreement between the interested parties. In order to ensure effective corrosion protection of steel structures, it is necessary for owners of such structures, planners, consultants, companies carrying out corrosion protection work, inspectors of protective coatings and manufacturers of coating materials to have at their disposal state-of-the-art information in concise form on corrosion protection by paint systems. Such information has to be as complete as possible, unambiguous and easily understandable to avoid difficulties and misunderstandings between the parties concerned with the practical implementation of protection work. This International Standard ISO 12944 is intended to give 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 the user of ISO 12944 is familiar with other relevant International Standards, in particular those dealing with surface preparation, as well as relevant national regulations. Although ISO 12944 does not deal with financial and contractual questions, attention is drawn to the fact that, because of the considerable implications of inadequate corrosion protection, non-compliance with requirements and recommendations given in this standard may result in serious financial consequences. ISO 12944-1 defines the overall scope of all parts of ISO 12944. 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 for a given project. This part of ISO 12944 describes different types of surface to be protected and 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, temporary protection of prepared surfaces, preparation of temporarily protected surfaces for further coatings, preparation of existing metal coatings, and environmental aspects. As far as possible, reference is made to the basic International Standards on the surface preparation of steel substrates before application of paints and related products. 1 Scope This part of ISO 12944 deals with 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. This part of ISO 12944 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 part of ISO 12944. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 12944. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 12944 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1461:, Hot dip galvanized coatings on fabricated ferrous products Specifications1). ISO 2063:1991, Metallic and other inorganic coatings Thermal spraying Zinc, aluminium and their alloys. ISO 2409:1992, Paints and varnishes Cross-cut test. 1) To be published. (Revision of ISO 1459:1973 and ISO 1461:1973) Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 09:04:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 12944-4:1998 2 © BSI 05-1999 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 schemes. ISO 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: Designation of degree of blistering. ISO 4628-3:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types