1、BRITISH STANDARDBS EN ISO 17834:2003Thermal spraying Coatings for protection against corrosion and oxidation at elevated temperaturesThe European Standard EN ISO 17834:2003 has the status of a British StandardICS 25.220.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g
2、44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 17834:2003Incorporating corrigendum July 2013BS EN ISO 17834:2003ISBN 978 0 580 83749 4Amendments/corrigenda issued since publicationDate Comments31 July 2013 Supersess
3、ion information in national foreword updatedThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 December 2003 The British Standards Institution 2013. Published by BSI Standards Limited 2013National forewordThis British Standard is the UK imple
4、mentation of EN ISO 17834:2003. It is identical to ISO 17834:2003. It supersedes BS 2569-2:1965, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/40, Thermal spraying and thermally sprayed coatings.A list of organizations represented on this committ
5、ee can be obtained on request to its secretary.The publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.EUROPEAN STANDARDNORME EUROPENNEEU
6、ROPISCHE NORMEN ISO 17834December 2003ICS 25.220.20English versionThermal spraying - Coatings for protection against corrosion andoxidation at elevated temperatures (ISO 17834:2003)Projection thermique - Revtements de protection contre lacorrosion et loxydation haute temprature (ISO17834:2003)Thermi
7、sches Spritzen - Beschichtungen zum Schutz gegenKorrosion und Oxidation bei erhhten Temperaturen (ISO17834: 2003)This European Standard was approved by CEN on 7 August 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe
8、anStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, Frenc
9、h, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark,
10、Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stas
11、sart, 36 B-1050 Brussels 2003 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 17834:2003 EEN ISO 17834:2003 (E)2ContentsForeword31 Scope 32 Normative references 33 Coating material and processes.44 Application of coating .55 Requ
12、ired characteristics.65.1 Coating thickness 65.2 Service temperature, environment and subsequent treatment 66 Re-treatment of defective areas .6Annex A (informative) Design recommendations for objects to be metal sprayed7Annex B (normative) Coating materials8EN ISO 17834:2003 (E)3ForewordThis docume
13、nt EN ISO 17834:2003 has been prepared by Technical Committee CEN/TC 240 “Thermal sprayingand thermally sprayed coatings”, the secretariat of which is held by DIN, in collaboration with Technical CommitteeISO/TC 107 “Metallic and other inorganic coatings”.This European Standard shall be given the st
14、atus of a national standard, either by publication of an identical text orby endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest byJune 2004.Annex A is informative. Annex B is normative.According to the CEN/CENELEC Internal Regulations, the na
15、tional standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland
16、and the United Kingdom.1 ScopeThis standard is applicable to sprayed metal coatings for protection against corrosion at temperatures up to 1000C(1273 K).For the protection of iron and steel by sprayed aluminium and zinc coatings against atmospheric corrosionreference should be made to prEN ISO 2063.
17、Coating materials other than metals, although they may be applied by spraying, are outside the scope of thisstandard.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate pla
18、ces in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referr
19、ed to applies (including amendments).EN 1274, Thermal spraying Powders Composition Technical supply conditions.EN 13507, Thermal spraying Pre-treatment of surfaces of metallic parts and components for thermal spraying.prEN ISO 2063, Thermal spraying Metallic and other inorganic coatings Zinc, alumin
20、ium and their alloys(ISO/DIS 2063:2002).EN ISO 14919, Thermal spraying Wires, rods and cords for flame and arc spraying Classification Technical supply conditions (ISO 14919:2001).ISO 14232, Thermal spraying Powders Composition and technical supply conditions.EN ISO 17834:2003 (E)43 Coating material
21、 and processesWhen selecting coating materials and processes, consideration shall be given to the different working temperaturesand operating environments that may be found.For example in any temperature range a coating may be required to resist: oxidation; other chemical attacks or; a combination o
22、f oxidation and other chemical attacks.Typical coating materials will include the following: nickel/chromium alloys; iron/chromium/aluminium alloys; metal/chromium/aluminium/yttrium alloys.NOTE The metal can be nickel, cobalt, iron or alloys of these.Other inert wear resistant materials such as chro
23、mium carbide, may be blended with these alloys to provide acombination of properties.When selecting coating materials, the following reactants and their effects either individually or when combinedshall be considered: oxygen; sulphur; chlorine; vanadium; potassium; sodium.Taking each of these in tur
24、n, the following points shall be considered:a) depending upon the presence or absence of oxygen, the corrosion characteristic can change significantly.Purely oxidising conditions indicate the use of aluminium alone;b) where high sulphur contents (mass fraction 0,5 %) are present, the use of iron bas
25、ed alloys is recommendedrather than nickel based unless their chromium content is a mass fraction 30 %;c) where high chlorine contents (mass fraction 0,5 %) are present, the use of nickel based alloys isrecommended rather than iron based unless their chromium content is a mass fraction 30 %;d) molte
26、n salts such as sodium or potassium vanadate require the addition of chromium to iron based materials.The chromium content shall be a mass fraction 25 % and the aluminium content a mass fraction 0,5 %;e) generally coating thicknesses of 0,2 mm shall be considered for aluminium and 0,4 mm for other m
27、aterials.With regard to the choice of process, the oxidation resistance of chromium bearing alloys is inversely related to theamount of chromium lost to oxide formed during the spraying process and the level of porosity. Thereforeprocesses that create lower oxide and porosity levels will tend to per
28、form better than others. Nevertheless thisshould be balanced against the fitness for purpose of the coating and economic factors.EN ISO 17834:2003 (E)54 Application of coatingThe coating shall be applied to the clean and dry surface, prepared in accordance with EN 13507.The sprayed coating shall be
29、applied as soon as possible after surface preparation and before visible deteriorationof the surface has occurred. If in comparison with a freshly prepared surface of material of similar quality visibledeterioration has occurred, the surface preparation shall be repeated. In no case shall delay betw
30、een surfacepreparation and coating application exceed 4 h unless special precautions, agreed between manufacturer andpurchaser, are taken to ensure a suitably controlled storage atmosphere.NOTE An initial thin coating of the sprayed metal can be applied to preserve the prepared surface; the requirem
31、ents ofclause 6 would then apply.The surface of the sprayed coating shall be of uniform texture free from lumps, coarse areas and loosely adherentparticles.Contamination or corrosion of the sprayed coating shall be avoided at all stages during the application of thecoating and the coating shall be m
32、aintained in a dry and clean condition until any subsequent treatment accordingto the requirements of clause 5 has been applied.Table 1 Coatings requirements and treatments for classes of service conditionsSprayed coating Subsequent treatmentClass ServiceTemperatureaandenvironmentCoatingmaterial(see
33、 annex B)NominalcoatingthicknessmmIntermediate/finaltreatmentAb350C to 550COxidising1,2 0,2may be sealed with siliconesealerBb350C to 900COxidising2 0,2may be sealed with siliconesealerCUp to 1000C(in absence ofsulphurous gasesor chlorine ormolten salts)3,4,5 0,4 DUp to 1000C(in presence ofsulphurou
34、s gasesbut not chlorine)4,5 0,4 EUp to 1000C(in presence ofsulphurous gasesand chlorine)5 0,4 FFor complexsevere corrosionconditions6 0,1may be diffusion heattreated in inert atmosphereaProvided it is realised that the service life will be affected, higher temperatures than those quoted may be toler
35、ated. The reduction in service life will depend on the duration of the higher temperatures.bAt temperatures below 350C in purely oxidising conditions the choice of coating material is not critical.EN ISO 17834:2003 (E)65 Required characteristics5.1 Coating thicknessThe nominal coating thickness shal
36、l be as given in Table 1 for the appropriate class of coating. When determinedby the method described in prEN ISO 2063, the minimum local coating thickness shall be not less than 75 % of thespecified nominal coating thickness, and the maximum local coating thickness shall not exceed the specifiednom
37、inal coating thickness by more than 0,1 mm.Coating thickness measurements shall be taken after the application of each coating metal and before anysubsequent treatment is applied.5.2 Service temperature, environment and subsequent treatmentRequirements on service temperature, environment and subsequ
38、ent treatment are given in Table 1.6 Re-treatment of defective areasAny area found to be defective immediately prior to subsequent treatment shall be blasted clean of all sprayedmetal prior to respraying, except that where the rejection has been solely due to too thin a coating, sprayed metalof the
39、same quality may be added, provided that the surface has been kept dry and is free from visiblecontamination.EN ISO 17834:2003 (E)7Annex A(informative)Design recommendations for objects to be metal sprayedComponents and structures to be metal sprayed should be designed from the outset with thermal s
40、praying clearlyin mind. Failure to do so is almost certain to increase the difficulties and cost of application and also to reduce theoverall service life.Three major guiding principles should be observed:a) design should ensure that all surfaces are fully accessible for surface preparation and perm
41、it complete anduniform application of the sprayed coatings;b) structure should be designed so that corrosion and oxidation have the greatest difficulty in establishing anyfocal point from which they can spread. This requirement demands cleanness of design and the elimination ofall features that migh
42、t facilitate lodgement or retention of foreign matter;c) the overall design should be planned to facilitate full inspection, ease of cleaning and maintenance.EN ISO 17834:2003 (E)8Annex B(normative)Coating materialsTable B.1 Coating materialsCode of thecoatingmaterial(seeTable 1)Material type Standa
43、rd1 Flame sprayed aluminium EN ISO 149192 Arc sprayed aluminium EN ISO 149193 nickel based alloys with chromium content 15 % EN ISO 14919, EN 1274,ISO 142324 iron based alloys with chromium content 25 % EN ISO 14919, EN 1274,ISO 142325 nickel based alloys with chromium content 30 % EN ISO 14919, EN
44、1274,ISO 142326 metala/chromium/aluminium/yttrium alloys EN 1274, ISO 14232aThe metal may be nickel, cobalt, iron or alloys of these.BS EN ISO 17834:2003BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standa
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