EN ISO 14713-2-2009 en Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 2 Hot dip galvanizing《镀锌制品 构筑物的钢铁腐.pdf

1、BS EN ISO14713-2:2009ICS 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 2: Hot dip galvanizing (ISO14713-2:2009)This British St

2、andard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2010 BSI 2010ISBN 978 0 580 62787 3Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 14713-2:2009National forewordThis British Standard is the UK implementation of EN ISO14713-2:

3、2009. Together with BS EN ISO 14713-1:2009 and BS EN ISO 14713-3:2009, it supersedes BS EN ISO 14713:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/34, Hot dip galvanized coatings.A list of organizations represented on this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 ob

4、tained 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 EUROPENNE EUROPISCHE NO

5、RM EN ISO 14713-2 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 2: Hot dip galvanizing (ISO 14713-2:2009) Revtements de zinc - Lignes direct

6、rices et recommandations pour la protection contre la corrosion du fer et de lacier dans les constructions - Partie 2: Galvanisation chaud (ISO 14713-2:2009) Zinkberzge - Leitfden und Empfehlungen zum Schutz von Eisen- und Stahlkonstruktionen vor Korrosion - Teil 2: Schmelztauchverzinken (ISO 14713-

7、2:2009) 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 bibliograp

8、hical 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

9、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,

10、 Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B

11、-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 14713-2:2009: EBS EN ISO 14713-2:2009EN ISO 14713-2:2009 (E) 3 Foreword This document (EN ISO 14713-2:2009) has been prepared by Technical Committee ISO/TC 107

12、 “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 en

13、dorsement, 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 identify

14、ing 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

15、, 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 14713-2:2009 has been approve

16、d by CEN as a EN ISO 14713-2:2009 without any modification. BS EN ISO 14713-2:2009ISO 14713-2:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Design for hot dip galvanizing .2 4.1 General .2 4.2 Surface preparation.2 4.3

17、 Procedures related to design considerations 3 4.4 Design features3 4.5 Tolerances3 5 Design for storage and transport 4 6 Effect of article condition on quality of hot dip galvanizing.4 6.1 General .4 6.2 Surface condition 6 6.3 Influence of steel surface roughness on the hot dip galvanized coating

18、 thickness6 6.4 Influence of thermal cutting processes 6 6.5 Effect of internal stresses in the basis steel 6 6.6 Large objects or thick steels7 6.7 Hot dip galvanizing practice.7 7 Effect of hot dip galvanizing process on the article 8 7.1 Dimensional tolerances on mating thread8 7.2 Effect of proc

19、ess heat.8 8 After-treatments.8 Annex A (informative) Preferred designs of articles for hot dip galvanizing .9 Bibliography18 BS EN ISO 14713-2:2009ISO 14713-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of nation

20、al 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. Internatio

21、nal 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 rule

22、s 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 l

23、east 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 14713-2 was prepared by Technical Committee ISO/TC

24、 107, Metallic and other inorganic coatings, Subcommittee SC 4, Hot dip coatings (galvanized, etc.). This first edition, together with ISO 14713-1 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 tit

25、le 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 The principal changes to this part of ISO 14713 compared to ISO 14713:1

26、999 are the following. This part of ISO 14713 only provides design guidance for hot dip galvanizing of articles. The normative references (Clause 2) have been updated to take into account the very latest standards available to readers. Additional guidance on the effect of the iron/steel surface comp

27、osition has been provided (6.1.1, Table 1). Additional information has been provided on the effect of thermal cutting processes (6.4) and the influence of internal stresses in the basis steel during hot dip galvanizing (6.5). BS EN ISO 14713-2:2009INTERNATIONAL STANDARD ISO 14713-2:2009(E) ISO 2009

28、All rights reserved 1Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel in structures Part 2: Hot dip galvanizing 1 Scope This part of ISO 14713 provides guidelines and recommendations regarding the general principles of design which are appropriate f

29、or articles to be hot dip galvanized for corrosion protection. The protection afforded by the hot dip galvanized coating to the article will depend upon the method of application of the coating, the design of the article and the specific environment to which the article is exposed. The hot dip galva

30、nized article can be further protected by application of additional coatings (outside the scope of this part of ISO 14713), such as organic coatings (paints or powder coatings). When applied to hot dip galvanized articles, this combination of coatings is often known as a “duplex system”. The guideli

31、nes and recommendations in this part of ISO 14713 do not deal with the maintenance of corrosion protection in service for steel with hot dip galvanized coatings. Guidance on this subject can be found in ISO 12944-5. Specific product-related requirements (e.g. for hot dip galvanized coatings on tubes

32、 or fasteners, etc.) 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 refe

33、renced document (including any amendments) applies. ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles Specifications and test methods ISO 4964, Steel Hardness conversions ISO 8044, Corrosion of metals and alloys Basic terms and definitions ISO 10684, Fasteners Hot dip galva

34、nized coatings ISO 12944-5, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 5: Protective paint systems EN 10210-1, Hot finished structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery requirements EN 10219-1, Cold forme

35、d welded structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery requirements BS EN ISO 14713-2:2009ISO 14713-2:2009(E) 2 ISO 2009 All rights reservedEN 10240, Internal and/or external protective coatings for steel tubes Specification for hot dip galvanized coatings

36、applied in automatic plants EN 10346, Continuously hot-dip coated steel flat products Technical delivery conditions 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8044 and the following apply. 3.1 hot dip galvanizing formation of a coating of zinc a

37、nd/or zinc/iron alloys on iron and steel products by dipping prepared steel or cast irons in the zinc melt 3.2 hot dip galvanized coating coating obtained by hot dip galvanizing NOTE The term “hot dip galvanized coating” is subsequently referred to as the “coating”. 4 Design for hot dip galvanizing

38、4.1 General It is essential that the design of any article required to be finished should take into account not only the function of the article and its method of manufacture but also the limitations imposed by the finish. Annex A illustrates some of the important design features, some of which are

39、specific to hot dip galvanizing. Some internal stresses in the articles to be galvanized will be relieved during the hot dip galvanizing process and this may cause deformation or damage of the coated article. These internal stresses arise from the finishing operations at the fabrication stage, such

40、as cold forming, welding, oxy-cutting or drilling, and from the residual stresses inherited from the rolling mill. The purchaser should seek the advice of the hot dip galvanizer before designing or making a product that is subsequently to be hot dip galvanized, as it may be necessary to adapt the co

41、nstruction of the article for the hot dip galvanizing process. The purchaser should be aware of the two distinct types of hot dip galvanizing and take these distinctions into account when designing articles: a) hot dip galvanizing after fabrication where, after suitable pretreatment, fabricated iron

42、 or steel articles are dipped in a bath containing a zinc melt (see ISO 1461); b) continuous galvanizing where, after suitable pretreatment, sheet materials are continuously fed through a zinc melt and the hot dip galvanized sheet materials are then used to fabricate an article (see EN 10346). 4.2 S

43、urface preparation The design and the materials used should permit good surface preparation. This is essential for the production of a high-quality coating (see 6.2). Surfaces should be free from defects to ensure a coating of good appearance and serviceability. Graphite exposed at the surface of ir

44、on castings interferes with wetting by molten metal and those castings that have been annealed may have silica particles in the surface layers which have to be removed in order to obtain a good-quality hot dipped coating. Grit blasting is recommended both before and after annealing. BS EN ISO 14713-

45、2:2009ISO 14713-2:2009(E) ISO 2009 All rights reserved 34.3 Procedures related to design considerations The hot dip bath and associated plant should be of adequate capacity to process the articles to be hot dip coated with zinc. Preferably, articles should be designed to enable coating in a single d

46、ipping operation. Articles that are too large for the available baths may be partially immersed and then reversed for length or depth, so that a complete coating is obtained. Partial immersion (and then dipping for a second time to complete the coating) is less common than the single, complete immer

47、sion operation. All work has to be secured during immersion in the baths. Bolt holes are often available. Lifting lugs are often incorporated to assist general handling. Articles may be held in racks or jigs; some contact marks may be visible after hot dip galvanizing in such cases. The dipping oper

48、ation involves vertical movement out of the bath, but the parts being withdrawn may be inclined at an angle. The processing sequence requires circulation of air, pretreatment liquids and zinc to all surfaces of the work piece. Air pockets prevent local surface preparation and give uncoated surfaces;

49、 liquids in enclosed air vaporize at the hot dip galvanizing temperature of about 450 C and the force generated can cause buckling or explosions; excess zinc may adhere poorly, may look unattractive and is wasteful. Suitable articles, e.g. heat exchangers and gas cylinders, may be hot dip galvanized on the outside only. This involves special techniques and equipment (e.g. to push the article into the bath against the buoyancy of the molten zinc) and a specialist galvanizer should be consulted in advance. 4.4 Des