BS EN ISO 14713-1-2009

BS EN ISO14713-1:2009ICS 25.220.40; 91.080.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDZinc coatings —Guidelines andrecommendations forthe protection againstcorrosion of iron andsteel in structuresPart 1: General principles of designand corrosion resistance (ISO14713-1:2009)This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2010© BSI 2010ISBN 978 0 580 62786 6Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 14713-1:2009National forewordThis British Standard is the UK implementation of EN ISO14713-1:2009. Together with BS EN ISO 14713-2:2009 and BS EN ISO 14713-3:2009, it supersedes BS EN ISO 14713:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/34, Hot dip galvanized coatings.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 14713-1 December 2009 ICS 25.220.40; 91.080.10 Supersedes EN ISO 14713:1999English Version Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 1: General principles of design and corrosion resistance (ISO 14713-1:2009) Revêtements de zinc - Lignes directrices et recommandations pour la protection contre la corrosion du fer et de l acier dans les constructions - Partie 1: Principes généraux de conception et résistance à la corrosion (ISO 14713-1:2009) Zinküberzüge - Leitfäden und Empfehlungen zum Schutz von Eisen- und Stahlkonstruktionen vor Korrosion - Teil 1: Allgemeine Konstruktionsgrundsätze und Korrosionsbeständigkeit (ISO 14713-1:2009) This European Standard was approved by CEN on 18 November 2009. 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 CEN Management Centre 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14713-1:2009: EBS EN ISO 14713-1:2009EN ISO 14713-1:2009 (E) 3 Foreword This document (EN ISO 14713-1:2009) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings“ in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the secretariat of which is held by BSI. 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 June 2010, and conflicting national standards shall be withdrawn at the latest by June 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 14713:1999. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 14713-1:2009 has been approved by CEN as a EN ISO 14713-1:2009 without any modification. BS EN ISO 14713-1:2009ISO 14713-1:2009(E) © ISO 2009 – All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Materials .3 4.1 Iron and steel substrates3 4.2 Zinc coatings .3 5 Selection of zinc coating 3 6 Design requirements.4 6.1 General principles of design to avoid corrosion .4 6.2 Design for application of different zinc coating processes5 6.3 Tubes and hollow sections.5 6.4 Connections.5 6.5 Duplex systems .6 6.6 Maintenance.7 7 Corrosion in different environments .7 7.1 Atmospheric exposure7 7.2 Exposure to soils.10 7.3 Exposure to water .12 7.4 Abrasion .12 7.5 Exposure to chemicals .12 7.6 Elevated temperatures13 7.7 Contact with concrete.13 7.8 Contact with wood.14 7.9 Bimetallic contact14 8 Accelerated test methods applied to zinc coatings.16 Bibliography17 BS EN ISO 14713-1:2009ISO 14713-1:2009(E) iv © ISO 2009 – All rights reservedForeword 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 14713-1 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 4, Hot dip coatings (galvanized, etc.). This first edition, together with ISO 14713-2 and ISO 14713-3, cancels and replaces ISO 14713:1999, which has been technically revised. ISO 14713 consists of the following parts, under the general title Zinc coatings — Guidelines and recommendations for the protection against corrosion of iron and steel in structures: ⎯ Part 1: General principles of design and corrosion resistance ⎯ Part 2: Hot dip galvanizing ⎯ Part 3: Sherardizing BS EN ISO 14713-1:2009INTERNATIONAL STANDARD ISO 14713-1:2009(E)© ISO 2009 – All rights reserved 1Zinc coatings — Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Part 1: General principles of design and corrosion resistance 1 Scope This part of ISO 14713 provides guidelines and recommendations regarding the general principles of design which are appropriate for articles to be zinc coated for corrosion protection and the level of corrosion resistance provided by zinc coatings applied to iron or steel articles, exposed to a variety of environments. Initial protection is covered in relation to ⎯ available standard processes, ⎯ design considerations, and ⎯ environments for use. This part of ISO 14713 applies to zinc coatings applied by the following processes: a) hot dip galvanized coatings (applied after fabrication); b) hot dip galvanized coatings (applied onto continuous sheet); c) sherardized coatings; d) thermal sprayed coatings; e) mechanically plated coatings; f) electrodeposited coatings. These guidelines and recommendations do not deal with the maintenance of corrosion protection in service for steel with zinc coatings. Guidance on this subject can be found in ISO 12944-5 and ISO 12944-8. NOTE There are a variety of product-related standards (e.g. for nails, fasteners, ductile iron pipes, etc.) which provide specific requirements for the applied zinc coating systems which go beyond any general guidance presented in this part of ISO 14713. These specific product-related requirements will take precedence over these general recommendations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods BS EN ISO 14713-1:2009ISO 14713-1:2009(E) 2 © ISO 2009 – All rights reservedISO 2063, Thermal spraying — Metallic and other inorganic coatings — Zinc, aluminium and their alloys ISO 2064, Metallic and other inorganic coatings — Definitions and conventions concerning the measurement of thickness ISO 2081, Metallic and other inorganic coatings — Electroplated coatings of zinc with supplementary treatments on iron or steel ISO 8044:1999, Corrosion of metals and alloys — Basic terms and definitions ISO 9223, Corrosion of metals and alloys — Corrosivity of atmospheres — Classification ISO 9224, Corrosion of metals and alloys — Corrosivity of atmospheres — Guiding values for the corrosivity categories ISO 9226, Corrosion of metals and alloys — Corrosivity of atmospheres — Determination of corrosion rate of standard specimens for the evaluation of corrosivity ISO 11844-1, Corrosion of metals and alloys — Classification of low corrosivity of indoor atmospheres — Determination and estimation of indoor corrosivity ISO 12683, Mechanically deposited coatings of zinc — Specification and test methods ISO 12944-5, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —Part 5: Protective paint systems ISO 12944-8, Paints and varnishes — Corrosion protection of steel structures by protective paint systems —Part 8: Development of specifications for new work and maintenance ISO 14713-2, Zinc coatings — Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Part 2: Hot dip galvanizing ISO 14713-3, Zinc coatings — Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Part 3: Sherardizing EN 10240, Internal and/or external protective coatings for steel tubes — Specification for hot dip galvanized coatings applied in automatic plants EN 10346, Continuously hot-dip coated steel flat products — Technical delivery conditions EN 13438, Paints and varnishes — Powder organic coatings for galvanized or sherardized steel products for construction purposes EN 13811, Sherardizing — Zinc diffusion coatings on ferrous products — Specification EN 15520, Thermal spraying — Recommendations for constructional design of components with thermally sprayed coatings 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 1461, ISO 2063, ISO 2064, ISO 8044, ISO 12683, EN 13811 and the following apply. 3.1 atmospheric corrosion corrosion with the earth’s atmosphere at ambient temperature as the corrosive environment (see ISO 8044:1999, 3.04) BS EN ISO 14713-1:2009ISO 14713-1:2009(E) © ISO 2009 – All rights reserved 33.2 elevated temperatures temperatures between + 60 °C and + 200 °C 3.3 exceptional exposure special cases, such as exposure that substantially intensifies the corrosive exposure and/or places increased demands on the corrosion protection system 3.4 life to first maintenance the time interval that can elapse after initial coating before coating deterioration reaches the point when maintenance is necessary to restore protection of the basis metal 4 Materials 4.1 Iron and steel substrates In hot dip galvanizing, the reactivity of the steel is modified by its chemical composition, particularly by the silicon plus phosphorus contents (see ISO 14713-2). The metallurgical and chemical nature of the steel is irrelevant to protection by thermally sprayed or sherardized coatings. The broad range of steels likely to be subject to zinc coating will commonly fall into the following categories: ⎯ carbon steel, composed simply of iron and carbon, accounts for 90 % of steel production [e.g. EN 10025-2 and EN 10080 (steel reinforcement)]; ⎯ high strength, low-alloy (HSLA) steels have small additions (usually 100 VH 20/40 VH 10/20 H 3/10 M 140 67/100 VH 33/67 VH 17/33 VH 6/17 H Hot dip galvanizing ISO 1461 200 95/100 VH 48/95 VH 24/48 VH 8/24 H 20 10/29 H 5/10 M 2/5 L 1/2 VL Hot dip galvanized sheet EN 10346 42 20/60 VH 10/20 H 5/10 M 2/5 L Hot dip galvanized tube EN 10240 55 26/79 VH 13/26 H 7/13 H 2/7 L 15 7/21 H 4/7 M 2/4 L 1/2 VL 30 14/43 VH 7/14 H 4/7 M 2/4 VL Sheradizing EN 13811 45 21/65 VH 11/25 H 6/11 M 3/6 L 5 2/7 L 1/2 VL 1/1 VL 0/1 VL Electrodeposited sheet ISO 2081 25 12/36 H 6/12 M 3/6 M 1/3 VL 8 4/11 M 2/4 L 1/2 VL 0/1 VL Mechanical plating ISO 12683 25 12/36 H 6/12 M 3/6 L 1/3 VL NOTE 1 The figures for life have been rounded to whole numbers. The allocation of the durability designation is based upon the average of the minimum and maximum of the calculated life to first maintenance, e.g. 85 µm zinc coating in corrosivity category C4 (corrosion rate for zinc between 2,1 µm per annum and 4,2 µm per annum), gives expected durability of 85/2,1 = 40,746 years (rounded to 40 years) and 85/4,2 = 20,238 years (rounded to 20 years). Average durability of (20 + 40)/2 = 30 years – designated “VH”. NOTE 2 Life to first maintenance of protective coating systems: The list of systems given in this table, classified by environment and typical time to first maintenance, indicates the options open to the specifier. The recommended treatments listed for longer lives will always protect for shorter periods and are often also economical for these shorter periods. NOTE 3 This table can be applied to any zinc coating to determine the life to first maintenance. The corrosion rate for any given environment is indicated by the corrosivity classification category, C3 to CX. The minimum and maximum lif