EN ISO 14713-3-2017 en Zinc coatings - Guidelines and recommendations for the protection against corrosion of iron and steel in structures - Part 3 Sherardizing.pdf

1、Zinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel in structuresPart 3: SherardizingBS EN ISO 147133:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation o

2、f EN ISO 147133:2017. It is identical to ISO 147133:2017. It supersedes BS EN ISO 147133:2009 , which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/34, Hot dip galvanized coatings.A list of organizations represented on this committee can be obtained on

3、 request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 94156 6ICS 91.080.10; 25.220.40Compliance

4、 with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 147133:2017EUROPEAN

5、 STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 147133May 2017ICS 25.220.40 Supersedes EN ISO 147133:2009, EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCENCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2017 CEN Ref. No. EN ISO 147133:20

6、17: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersZinc coatings Guidelines and recommendations for the protection against corrosion of iron and steel in structures Part 3: Sherardizing (ISO 147133:2017)Revtements de zinc Lignes directrices et rec

7、ommandations pour la protection contre la corrosion du fer et de lacier dans les constructions Partie 3: Shrardisation (ISO 147133:2017)Zinkberzge Leitfden und Empfehlungen zum Schutz von Eisen und Stahlkonstruktionen vor Korrosion Teil 3: Sherardisieren (ISO 147133:2017)This European Standard was a

8、pproved by CEN on 3 May 2017.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. Uptodate lists and bibliographical references concerning such national sta

9、ndards may be obtained on application to the CENCENELEC 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 no

10、tified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, I

11、celand, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 147133:2017 (E)European forewordThis document (EN ISO 147133:2017) has been prepared b

12、y Technical Committee ISO/TC 107 “Metallic and other inorganic coatings” in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings, including for corrosion protection and corrosion testing of metals and alloys” the secretariat of which is held by BSI.This European S

13、tandard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2017, and conflicting national standards shall be withdrawn at the latest by November 2017.Attention is drawn to the possibility that some of the elements

14、 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 147133:2009 .According to the CENCENELEC Internal Regulations, the national standards organizations of the following c

15、ountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

16、 Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 147133:2017 has been approved by CEN as EN ISO 147133:2017 without any modification.iiBS EN ISO 147133:2017ISO 147133:2017(E)Foreword ivIntroduction v1

17、Scope . 12 Normative references 13 Terms and definitions . 14 Design for sherardizing . 24.1 General . 24.2 Surface preparation 24.3 Design considerations. 34.4 Clearances of threaded components 35 Storage and transport . 45.1 General . 45.2 Recommendations for storage and transport 46 Effects of ar

18、ticle condition on quality of sherardizing 46.1 Composition 46.2 Surface condition 46.3 Influence of steel surface roughness on the sherardized coating thickness 56.4 Internal stresses in the base material . 56.4.1 General 56.4.2 Distortion cracking 56.4.3 Hydrogen embrittlement 66.5 Large objects a

19、nd thick steels 67 Effect of sherardizing process on the article . 67.1 Processing circumstances . 67.2 Coating properties influenced by the sherardizing process 67.2.1 Sherardizing practice . 67.2.2 Surface properties of the finished article . 68 Aftertreatments . 7Bibliography 8 ISO 2017 All right

20、s reserved iiiContents PageBS EN ISO 147133:2017ISO 147133:2017(E)ForewordISO (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 c

21、ommittees. 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 nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with th

22、e International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for

23、the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.

24、ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this doc

25、ument is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade

26、Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 4, Hot dip coatings (galvanized, etc.).This second edition

27、cancels and replaces the first edition (ISO 14713-3:2009 ), of which it constitutes a minor revision following the publication of ISO 17668 with the following changes: ISO 17668 has replaced EN 13811 ; Table 1 has been amended to align coating classes with ISO 17668.A list of all parts in the ISO 14

28、713 series can be found on the ISO website.iv ISO 2017 All rights reservedBS EN ISO 147133:2017ISO 147133:2017(E)IntroductionSherardizing is a thermal diffusion process in which articles are heated in the presence of a sherardizing mixture consisting of zinc dust with or without an inert material.Th

29、e process is carried out in a slowly rotating closed container at temperatures ranging from about 300 C to 500 C. The normal processing temperature is below the melting point of zinc (419 C).During the process, zinc/iron alloys are built up on the surface of the ferrous articles. A coating thickness

30、 of 10 m to 75 m (and higher if required) can be achieved. The coating thickness is accurately controlled by the amount of zinc dust, the processing time and temperature. The coating closely follows the contours of the basis material, and uniform coatings are produced on articles, including those of

31、 irregular shape.After sherardizing, the containers are cooled down. A screening process separates the sherardized articles from the unused sherardizing mixture. The articles, with the zinc/ironalloyed layer, are normally posttreated by phosphating, chromating or another suitable passivation process

32、 (conversion coating) resulting in a dustfree and clean passivated surface.Most steel and iron articles can be sherardized. ISO 2017 All rights reserved vBS EN ISO 147133:2017This page deliberately left blankZinc coatings Guidelines and recommendations for the protection against corrosion of iron an

33、d steel in structures Part : Sherardizing1 ScopeThis document provides guidelines and recommendations regarding the general principles of design that are appropriate for articles to be sherardized for corrosion protection.The protection afforded by the sherardized coating to the article will depend

34、upon the method of application of the coating, the design of the article and the specific environment to which the article is exposed. The sherardized article can be further protected by application of additional coatings (outside the scope of this document), such as organic coatings (wet paints or

35、powder coatings). When applied to sherardized articles, this combination of coatings is often known as a “duplex system”.General guidance on this subject can be found in ISO 129445 and EN 13438 .The maintenance of corrosion protection in service for steel with sherardized coatings is outside the sco

36、pe of this document.Specific product-related requirements (e.g. for sherardized coatings on fasteners or tubes, etc.) will take precedence over these general recommendations.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content cons

37、titutes requirements 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 8044 , Corrosion of metals and alloys Basic terms and definitions3 Terms and definitionsFor the pu

38、rposes of this document, the terms and definitions given in ISO 8044 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http

39、:/www.iso.org/obp 3.1sherardizingthermal diffusion process in which articles are heated in close contact with a sherardizing mixture, consisting of zinc dust with or without an inert material, in a closed container, usually rotatedINTERNATIONAL STANDARD ISO 147133:2017(E) ISO 2017 All rights reserve

40、d 1BS EN ISO 147133:2017ISO 147133:2017(E)3.2sherardized coatingcoating consisting of zinc/iron alloys obtained by the sherardizing process, and normally posttreated by phosphating, chromating or another suitable passivating process (conversion coating)Note 1 to entry: “Sherardized coating” is refer

41、red to in this document as “coating”.4 Design for sherardizing4.1 GeneralIt 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.Sherardizing is a

42、 process developed to protect components of various sizes, but mainly small articles, against corrosion and wear. No jig marks are visible after sherardizing. Normal sherardizing equipment has containers with nominal dimensions of 2 000 mm 480 mm 400 mm. Specialized equipment has been developed to t

43、reat large tubes for the gas and oil industry and large articles of complex shape for the automotive industry.Some internal stresses in the articles to be sherardized will be relieved during the sherardizing process and this may cause deformation of the coated article. Normally, the sherardizing is

44、carried out between 320 C and 419 C.The purchaser should seek the advice of the sherardizer before designing or manufacturing a product that is subsequently to be sherardized, as it may be necessary to adapt the construction of the article for the sherardizing process, especially when very fragile c

45、omponents are sent for sherardizing. These components may be liable to damage and distortion during processing. The sherardizer may be able to recommend a design modification.4.2 Surface preparationThe design and the materials used should permit good surface preparation. This is essential for the pr

46、oduction of a highquality coating. Sherardizing is only effective on surfaces free of oil, grease, and rust, scale or other surface contaminants. It is recommended to avoid lacquers, wax, paint, oil and greasebased markings. Surfaces should be free from defects to ensure a coating of good appearance

47、 and serviceability.Grit blasting is the preferred surface preparation for sherardizing because the abraded surface responds very well to the sherardizing process, and the risk of hydrogen embrittlement to spring steels and to hightensile steels, or damage to freecutting steels, is avoided.In case a

48、lkaline degreasing is applied, the articles should be dried before being grit blasted, if necessary, or before being sherardized.Sintered materials should be free of oil and resins before they are sent for sherardizing.For castings, grit blasting is essential to remove moulding sand.In special cases

49、, e.g. to remove scale, hydrochloric acid pickling can be considered. However, it is recommended to remove scale from articles before the final machining, so that the articles are not damaged in the pretreatment stage of the sherardizing process to provide a coating of good appearance and serviceability. The purchaser should seek the advice of the sherardizer in case such a pretreatment is required.2 ISO 2017 All rights reservedBS EN ISO 147133:2017ISO 147133:2017(E)4.3 Desi