1、BRITISH STANDARD BS EN ISO 16048:2003 Passivation of corrosion-resistant stainless-steel fasteners The European Standard EN ISO 16048:2003 has the status of a British Standard ICS 21.060.01 BS EN ISO 16048:2003 This British Standard was published under the authority of the Standards Policy and Strat
2、egy Committee on 20 June 2003 BSI 20 June 2003 ISBN 0 580 42131 7 National foreword This British Standard is the official English language version of EN ISO 16048:2003. It is identical with ISO 16048:2003. The UK participation in its preparation was entrusted to Technical Committee FME/9, Bolts, nut
3、s and accessories (+QA and hose clamps), which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may
4、be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users ar
5、e responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and
6、 keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 4, an
7、d inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO16048 February2003 ICS21.060.01 Englishversion Passivatio
8、nofcorrosionresistantstainlesssteelfasteners(ISO 16048:2003) Passivationdeslmentsdefixationenacierinoxydable rsistantlacorrosion(ISO16048:2003) PassivierungvonVerbindungselementenaus nichtrostendenSthlen(ISO16048:2003) ThisEuropeanStandardwasapprovedbyCENon2January2003. CENmembersareboundtocomplywit
9、htheCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandard
10、existsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmar
11、k,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels
12、2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO16048:2003EForeword Thisdocument(ENISO16048:2003)hasbeenpreparedbyTechnicalCommitteeISO/TC2 “Fasteners“incollaborationwithTechnicalCommitteeCEN/TC185“Threadedandnonthreaded mechanicalfastenersan
13、daccessories“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofan identicaltextorbyendorsement,atthelatestbyAugust2003,andconflictingnationalstandardsshall bewithdrawnatthelatestbyAugust2003. AccordingtotheCEN/CENELECInternalRegulati
14、ons,thenationalstandardsorganizationsofthe followingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg, Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.
15、NOTEFROMCMC TheforewordissusceptibletobeamendedonreceptionoftheGermanlanguage version.Theconfirmedoramendedforeword,andwhenappropriate,thenormativeannexZAforthe referencestointernationalpublicationswiththeirrelevantEuropeanpublicationswillbecirculatedwith theGermanversion. Endorsementnotice Thetexto
16、fISO16048:2003hasbeenapprovedbyCENasENISO16048:2003withoutany modifications. ENISO16048:2003 Reference number ISO 16048:2003(E)INTERNATIONAL STANDARD ISO 16048 First edition 2003-02-01 Passivation of corrosion-resistant stainless-steel fasteners Passivation des lments de fixation en acier inoxydable
17、 rsistant la corrosion ENISO16048:2003ISO 16048:2003(E) DPlcsid Fremia ihTs PDF file mya ctnoian emdebt dedyfepcaes. In ccacnadrow eitA hebods licnesilop gnic,y tihs file mirp eb yatnde iv roweb detu slahl ton ide ebtlnu deess teh typfecaes wihce era hml era deddebicsnede ti dna onstlalde t noeh com
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20、neC ehlar Secterirata ta teh serddaig sleb nevwo. ISO 3002 Athgir lls serevr.de selnUs towrehise specfidei, trap on fo thsi ilbupctanoi may cudorper ebtu ro dezilina ni dey fomr yb ro nam y,snae lecetrinoc m roceinahcla, icnliduntohp gcoiypom dna gnicrfoilm, wittuoh mrepissii non writif gnrmo ietI r
21、ehSta O tserdda ehs ebolw or ISOs memreb i ydobn the cnuotfo yr ttseuqer ehe.r ISO cirypothg fofice saCe tsopale 65 eneG 1121-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mial coirypthgis.o gro We bwww.is.o groii ENISO16048:2003ISO 16048:2003(E) iiiForeword ISO (the International Organiz
22、ation 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
23、 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. I
24、nternational 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. Publ
25、ication 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
26、rights. ISO 16048 was prepared by Technical Committee ISO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. ENISO16048:2003ISO 16048:2003(E) iv Introduction In the preparation of this International Standard special attention has been given to the fundamental fact that a surface
27、 film of chromium oxide is immediately formed when producing stainless steel or products made of stainless steel. It is this very thin oxide film which can be thickened by passivation. The thickness of the layer is about 0,002 m. ENISO16048:2003INTENRATIONAL TSANDADR IS:84061 O3002(E)1Passivation of
28、 corrosion-resistant stainless-steel fasteners 1 Scope This International Standard specifies the methods most often used for passivation of corrosion-resistant stainless steel fasteners. Typical anodic dissolution behaviour of an active-passive-transpassive metal is given in Annex A. 2 Normative ref
29、erences 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 3506-1:1997, Mechanical properties of
30、 corrosion-resistant stainless-steel fasteners Part 1: Bolts, screws and studs ISO 3506-2:1997, Mechanical properties of corrosion-resistant stainless-steel fasteners Part 2: Nuts ISO 3506-3:1997, Mechanical properties of corrosion-resistant stainless-steel fasteners Part 3: Set screws and similar f
31、asteners not under tensile stress ISO 3506-4: 1) , Mechanical properties of corrosion-resistant stainless-steel fasteners Part 4: Tapping screws 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 passivation chemical treatment that increases the
32、 thickness of the naturally occurring chromium rich oxide film present on all types of stainless-steel surfaces 3.2 passivity chemically inactive surface condition of stainless steels 1) To be published. ENISO16048:2003ISO 16048:2003(E) 2 4 Passivation 4.1 Pickling prior to passivation Before passiv
33、ation, a pickling treatment in a bath selected from those listed in Table 1 is recommended. Before pickling, the fasteners shall be degreased and rinsed. Table 1 Pickling baths Steel grade aChemicals Concentration cvolume % Temperature cC Exposure time for fresh bath cmin A2 A3 A4 A5 C3 b F1 HNO 320
34、 to 30 20 to 60 10 to 30 H 2 SO 48 to 11 60 to 80 5 to 30 A1 C1 b C4 bHNO 310 to 15 20 to 60 10 to 30 H 2 SO 48 to 11 60 to 80 5 to 30 aSteel grades in accordance with ISO 3506-1, ISO 3506-2, ISO 3506-3 and ISO 3506-4. bPrior to pickling, hot forged C1, C3 and C4 fasteners shall be soft annealed to
35、the softest condition and shot-peened in order to reduce the risk of hydrogen embrittlement. For fasteners manufactured from soft annealed and ground C1, C3 and C4 raw material only a shot peening may be necessary. cIf necessary, values outside the specified ranges are permitted in adjusting the aci
36、d concentration, temperature and exposure time. ENISO16048:2003ISO 16048:2003(E) 34.2 Passivation process After pickling, the fastener shall be passivated in a bath selected from those listed in Table 2. Table 2 Passivation baths Steel grade aChemicals Concentration volume % Temperature C Typical ex
37、posure time min A2, A3, A4, A5 C1 F1 HNO 320 to 50 20 to 40 A1 C4 HNO 3 b25 to 35 A1 HNO 3+ Na 2 Cr 2 O 7 . 2H 2 O c15 to 25 C4 HNO 3+ Na 2 Cr 2 O 7 . 2H 2 O c2 to 6 15 to 40 10 to 30 aSteel grades in accordance with ISO 3506-1, ISO 3506-2, ISO 3506-3 and ISO 3506-4. bUse preferably this bath. cThe
38、addition of Na 2 Cr 2 O 7 2H 2 O may be used to minimize the discoloration or etching of high carbon and free-cutting stainless steels. 5 Verification of passivation Passivation shall be verified by the manufacturers quality assurance system. There is no known referee test method for passivation. EN
39、ISO16048:2003ISO 16048:2003(E) 4 Annex A (informative) Passivity Figure A.1 schematically illustrates the typical behaviour of an active-passive-transpassive metal. The metal initially demonstrates behaviour similar to non-passivating metals, i.e., as the electrode potential is made more positive, t
40、he metal follows typical Tafel behaviour, and dissolution rate increases exponentially. This is the active region. At more noble potentials, dissolution rate decreases to a very small value and remains essentially independent of potential over a considerable potential region. This is termed the pass
41、ive region. Finally, at very noble potentials, dissolution rate again increases with increasing potential in the transpassive region. aActive bPassive cTranspassive dLogarithmic scale Figure A.1 Typical anodic dissolution behaviour of an active-passive-transpassive metal ENISO16048:2003BS EN ISO 160
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