BS ISO 4525-2003 Metallic coatings - Electroplated coatings of nickel plus chromium on plastics materials《金属镀层 塑料材料上的镍加铬电镀层》.pdf

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1、BRITISH STANDARDBS ISO 4525:2003Metallic coatings Electroplated coatings of nickel plus chromium on plastics materialsICS 25.220.40g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g

2、51g60g53g44g42g43g55g3g47g36g58Incorporatingcorrigendum August 2009National forewordThis British Standard is the UK implementation of ISO 4525:2003. It supersedes BS 4601:1970 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/33, Electrodeposited and

3、 related coatings.A list of organizations represented on this committee can be obtained on 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.Compliance with a British Standard cannot con

4、fer immunity from legal obligations.BS ISO 4525:2003Amendments/corrigenda issued since publicationDate Comments 31 August 2009 Supersession information added to National forewordThis British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 February 2003

5、 BSI 2009ISBN 978 0 580 67530 0INTERNATIONALSTANDARDISO4525Second edition2003-02-15Reference numberISO 4525:2003(E)Metallic coatings Electroplated coatings of nickel plus chromium on plastics materialsRevtements mtalliques Dpts lectrolytiques de nickel plus chrome sur matires plastiquesBS ISO 4525:2

6、003BS ISO 4525:2003iiISO 4525:2003ISO 2543002:5)E( ISO 3002 r llAithgs reservde iiiContents Page1 Scope . 12 Normative references . 13 Terms and definitions 24 Information to be supplied to the electroplater . 25 Service condition number . 26 Designation . 37 Requirements . 58 Sampling . 79 Test met

7、hods 7AnnexesA Thermal cycle test . 8B Examples of service conditions for which the various service condition numbers are appropriate 9C Ductility test. 10D Determination of sulfur content of electrodeposited nickel . 11E Determination of cracks and pores in chromium coatings 12F Methods of test for

8、 the determination of thickness 13G Combined thermal cycle and corrosion testing. 14Bibliography. 15BS ISO 4525:2003iiiISO 4525:2003ISO :5254(3002)Evi ISO 3002 Ar llithgr seresvdeForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (

9、ISOmember bodies). The work of preparing International Standards is normally carried out through ISO technicalcommittees. Each member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee. International organizations, gover

10、nmental and non-governmental, inliaison with ISO, also take part in the work. ISO collaborates closely with the International ElectrotechnicalCommission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Dire

11、ctives, Part 3.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 eleme

12、nts of this International Standard may be the subject ofpatent rights. ISO shall not be held responsible for identifying any or all such patent rights.International Standard ISO 4525 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganiccoatings, Subcommittee SC 3, Electrodepos

13、ited coatings and related finishes.This second edition cancels and replaces the first edition (ISO 4525:1985), which has been technically revised.Annexes A, C, D, E, F and G form a normative part of this International Standard. Annex B is for information only.BS ISO 4525:2003ivISO 4525:2003ISO 25430

14、02:5)E( ISO 3002 r llAithgs reservde vIntroductionThe traditional method of preparing plastics for electroplating includes electrodeposition of a ductile acid copperlayer, before electroplating with nickel plus chromium, to meet thermal cycle requirements. The elimination of copperand its substituti

15、on with ductile nickel is a new trend aimed at facilitating the reclamation of electroplated plastics atthe end of the product-life cycle. Nickel plus chromium metal can be readily separated from plastics and utilizeddirectly in the production of stainless steel, whereas copper plus nickel plus chro

16、mium coatings would first requireseparation and complete removal of copper because of its detrimental effects on the properties of stainless steel.Although the traditional method is still the one most widely applied, the automotive and plumbing industries are nowspecifying ductile nickel as replacem

17、ent for copper undercoats in Europe, because of the reclamation benefits.These recent trends have been taken into account in revising this document which permits the specification ofdecorative, electroplated nickel plus chromium coatings on plastics materials with either copper or nickel undercoatsw

18、hen thermal cycle resistance is a requirement.New developments in preparing plastics for electroplating, e.g., the use of ionic palladium catalysts, and theelimination of electroless deposition and chromic/sulfuric acid etchants, make it more essential than ever that theinstructions provided by the

19、suppliers of proprietary processes for preparing plastics for electroplating be followed.Proper surface preparation is essential to obtain satisfactory performance of electroplated coatings on plasticsmaterials.No distinction is made between the types of plastics suitable for electroplating and no d

20、etailed requirements are laiddown concerning the surface condition of the plastics material or the level of moulding stresses. However, whereplastics articles are produced by some technique that involves a change of phase, such as moulding, then it isessential that the electroplating operation not t

21、ake place until at least have elapsed after production.24 hBS ISO 4525:2003vISO 4525:2003ANRETNIITOTS LANDNADRA ISO 2543002:5)E( ISO 3002 r llAithgs reservde 1Metallic coatings Electroplated coatings of nickel plus chromium on plastics materials1 ScopeThis International Standard specifies requiremen

22、ts for decorative, electroplated coatings of nickel plus chromium withand without copper undercoats on plastics materials. It permits the use of either a copper or ductile nickel undercoatto satisfy thermal cycle requirements.This International Standard is not applicable to such coatings on plastics

23、 to be used for engineering purposes.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions ofthis International Standard. For dated references, subsequent amendments to, or revisions of, any of thesepublications do not

24、 apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forundated references, the latest edition of the normative document referred to applies. Members o

25、f ISO and IECmaintain registers of currently valid International Standards.ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical methodISO 2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement ofthicknessISO 2080, Surface tr

26、eatment, metallic and other inorganic coatings VocabularyISO 2177, Metallic coatings Measurement of coating thickness Coulometric method by anodic dissolutionISO 2361, Electrodeposited nickel coatings on magnetic and non-magnetic substrates Measurement of coatingthickness Magnetic methodISO 3497, Me

27、tallic coatings Measurement of coating thickness X-ray spectrometric methodsISO 3543, Metallic and non-metallic coatings Measurement of thickness Beta backscatter methodISO 4519, Electrodeposited metallic coatings and related finishes Sampling procedures for inspection byattributesISO 8401, Metallic

28、 coatings Review of methods of measurement of ductilityISO 9227, Corrosion tests in artificial atmospheres Salt spray testsISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates Rating oftest specimens and manufactured articles subjected to corrosion

29、 testsISO 16348, Metallic and other inorganic coatings Definitions and conventions concerning appearanceASTM B764-94, Standard Test Method for Simultaneous Thickness and Electrochemical Potential Determination ofIndividual Layers in Multilayer Nickel Deposit (STEP Test)BS ISO 4525:20031ISO 4525:2003

30、ISO :5254(3002)E2 ISO 3002 Ar llithgr seresvde3 Terms and definitionsFor the purposes of this International Standard, the following terms and definitions given in ISO 2064, ISO 2080 andISO 16348 apply.4 Information to be supplied to the electroplater4.1 Essential informationWhen ordering articles to

31、 be electroplated in accordance with this International Standard, the purchaser shall providethe following information in writing, e.g., in the contract or purchase order, or on engineering drawings:a) the designation (see clause 6);b) the appearance required, e.g. bright, dull or satin; alternative

32、ly, a sample showing the required finish shall besupplied or approved by the purchaser and used for comparison purposes in accordance with 7.2;c) the significant surfaces to be indicated on drawings of the parts, or by providing samples that are suitablymarked;d) additional portions of the significa

33、nt surface where local thickness requirements are to be applied (see 7.4);e) the positions on significant surfaces for rack or contact marks where such marks are unavoidable (see 7.2);f) whether copper or nickel undercoats shall be applied to meet the thermal cycle requirements (see 7.3, 7.6 and7.8)

34、;g) whether corrosion testing is to be done continuously or cyclically (see 7.7);h) whether corrosion and thermal cycle tests (see 7.6 and 7.7) shall be done individually on separate specimens orsequentially using the same specimens (see 7.8), and whether the specimens shall be mounted or unmounted

35、ina manner simulating assembly during testing (annex A);i) any requirements for STEP testing (see 7.9);j) sampling methods and acceptance levels (see clause 8); k) the designation of the type of plastic to be electroplated (see 7.1).4.2 Additional informationThe following additional information may

36、be provided by the purchaser, when appropriate.a) The limitations on the extent of tolerable surface defects resulting from moulding (see 7.1).b) The extent to which defects are to be tolerated on non-significant surfaces (see 7.2).5 Service condition numberThe service condition number shall be used

37、 by the purchaser to determine the degree of protection required asrelated to the severity of the conditions to which a product is to be subjected, in accordance with the following scale:5 Exceptionally severe4 Very severe3Sevre2 Moderate1MildBS ISO 4525:20032ISO 4525:2003ISO 2543002:5)E( ISO 3002 r

38、 llAithgs reservde 3Typical service conditions for which the various service condition numbers are appropriate are defined in annex B.6 Designation6.1 GeneralThe designation is a means of specifying the types and thicknesses of coatings appropriate for each servicecondition (see Table 1) and compris

39、es the following:a) the term, “Electroplated coating”, the number of this International Standard, ISO 4525, followed by a hyphen;b) the letters, PL, indicating a plastics base material followed by a solidus ( );c) the chemical symbol, Cu, for the copper undercoat (or the chemical symbol, Ni, when th

40、e undercoat is nickel);copper or nickel undercoats shall only be omitted when there are no requirements for thermal cycle resistance,as specified by the purchaser;d) a number giving the minimum local thickness (see ISO 2064), in micrometres, of the copper (or nickel)undercoat;e) a lower-case letter

41、designating the type of copper or nickel undercoat (see 6.2);f) the chemical symbol, Ni, for nickel;g) a number indicating the minimum local thickness (see ISO 2064), in micrometres, of the nickel coating;h) a letter designating the type of nickel coating (see 6.3);i) the chemical symbol, Cr, for ch

42、romium;j) a letter or letters designating the type and thickness of the chromium deposit (see 6.5).6.2 Type of copper or nickel undercoatThe type of copper undercoat shall be designated by the following symbol:a for ductile, levelling copper electrodeposited from acid-type solutions.The type of nick

43、el undercoat shall be designated by the following symbol:dp for ductile, columnar nickel electrodeposited from special pre-electroplating solutions.NOTE The type of nickel required for thermal cycle resistance may be obtained by electroplating from Watts or nickel sulfamatesolutions containing no or

44、ganic additives or brighteners, as well as from special proprietary formulations available from suppliersof electroplating processes. See 3, 4, 5 for additional background information.Table 1 Coatings on plastics materialsService condition numberPartial coating designation for copper plus nickel plu

45、s chromium coatingsPartial coating designation for nickel plus chromium coatings5 PL/Cu15a Ni30d Cr mp (or mc) PL/Ni20dp Ni20d Cr mp (or mc)4PL/Cu15a Ni30d Cr r PL/Ni20dp Ni20d Cr rPL/Cu15a Ni25d Cr mp (or mc) PL/Ni20dp Ni20b Cr mp (or mc)3PL/Cu15a Ni25d Cr r PL/Ni20dp Ni15b Cr rPL/Cu5a Ni20d Cr mp

46、(or mc)2PL/Cu15a Ni15b Cr r PL/Ni20dp Ni10b Cr rPL/Cu15a Ni10b Cr mp (or mc)1 PL/Cu15a Ni7b Cr r PL/Ni20dp Ni7b Cr r/BS ISO 4525:20033ISO 4525:2003ISO :5254(3002)E4 ISO 3002 Ar llithgr seresvde6.3 Type of nickelThe type of nickel applied over the copper or nickel undercoat shall be designated by the

47、 following symbols:b for nickel deposited in the fully bright condition;s for dull or semi-bright nickel that shall not have been mechanically polished;d for double- or triple-layer nickel coatings, the requirements for which are given in Table 2.6.4 Double- and triple layer coatingsThe requirements

48、 for double- and triple-layer coatings are summarized in Table 2.6.5 Types and thicknesses of chromiumThe types and thicknesses of chromium shall be designated by the following symbols placed after the chemicalsymbol, Cr, as follows:r regular (i.e., conventional) chromium having a minimum local thic

49、kness of ;mc micro-cracked chromium having more than 250 cracks per centimetre in any direction, forming a closednetwork over the whole of the significant surface when determined by one of the methods specified inannex E and having a thickness of . With some processes, a substantially greater thickness (about) of chromium may be required to achieve the necessary crack pattern, in which case the minimumlocal thickness shall be included in the coating designation as follows: Cr mc (0,8);mp micro-porous chromium,