1、BS EN ISO4521:2008ICS 25.220.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMetallic and otherinorganic coatings Electrodepositedsilver and silveralloy coatings forengineering purposes Specification andtest methods (ISO4521:2008)This British Standardwas publi
2、shed underthe authority of theStandards Policy andStrategy Committee on 30September 2008 BSI 2008ISBN 978 0 580 54192 6Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 4521:2008National forewordThis British Standard is the UK implementation of EN ISO 4521:2008. Itsupersedes BS 28
3、16:1989, BS 6669-1:1986, BS 6669-2:1986 and BS 6669-3:1989 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/33, Electrodeposited and related coatings.A list of organizations represented on this committee can be obtained onrequest to its secretary.Thi
4、s 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 STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 4521September 2008ICS 25.220.40
5、English VersionMetallic and other inorganic coatings - Electrodeposited silverand silver alloy coatings for engineering purposes - Specificationand test methods (ISO 4521:2008)Revtements mtalliques et autres revtementsinorganiques - Dpts lectrolytiques dargent et dalliagesdargent pour applications i
6、ndustrielles - Spcifications etmthodes dessai (ISO 4521:2008)Metallische berzge - Galvanische Silber- undSilberlegierungs-berzge fr technische Zwecke -Anforderungen und Prfverfahren (ISO 4521:2008)This European Standard was approved by CEN on 24 August 2008.CEN members are bound to comply with the C
7、EN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard 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 CEN Management Centre or t
8、o any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions
9、.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, S
10、weden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.R
11、ef. No. EN ISO 4521:2008: EBS EN ISO 4521:2008EN ISO 4521:2008 (E) 3 Foreword This document (EN ISO 4521:2008) has been prepared by Technical Committee ISO/TC 107 “Metallic and other inorganic coatings“ in collaboration with Technical Committee CEN/TC 262 “Metallic and other inorganic coatings” the
12、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 endorsement, at the latest by March 2009, and conflicting national standards shall be withdrawn at the latest by March 2009. Attention is dra
13、wn 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 identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followi
14、ng countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloven
15、ia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 4521:2008 has been approved by CEN as a EN ISO 4521:2008 without any modification. BS EN ISO 4521:2008ISO 4521:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Norm
16、ative references . 1 3 Terms and definitions. 2 4 Information to be supplied by the purchaser to the electroplater. 2 4.1 Essential information . 2 4.2 Additional information 3 5 Designation . 3 5.1 General. 3 5.2 Designation specifications 4 5.3 Designation of the basis material . 4 5.4 Designation
17、 of heat treatment requirements . 4 5.5 Examples of designations . 5 6 Requirements 5 6.1 General. 5 6.2 Appearance . 5 6.3 Thickness 6 6.4 Porosity 6 6.5 Accelerated corrosion testing . 6 6.6 Composition 6 6.7 Stress-relief heat treatment prior to electroplating. 6 6.8 Hydrogen-embrittlement-relief
18、 heat treatment after electroplating. 6 6.9 Adhesion 7 6.10 Electrical properties . 7 6.11 Microhardness 7 6.12 Solderability 7 6.13 Wear resistance 7 6.14 Ductility 7 6.15 Undercoats 7 6.16 Freedom from contamination 8 6.17 Anti-tarnish treatments 8 7 Sampling 8 Annex A (normative) Requirements for
19、 undercoats. 9 Annex B (normative) Methods of measuring the thickness of electroplated silver and silver alloy coatings . 11 Annex C (normative) Adhesion tests . 15 Annex D (normative) Determination of the presence of residual salts 17 Bibliography . 19 BS EN ISO 4521:2008ISO 4521:2008(E) iv ISO 200
20、8 All rights reservedForeword ISO (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 committees. Each member body interested in a
21、subject for which a technical committee has been established 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
22、 (IEC) on all matters of electrotechnical standardization. International 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 com
23、mittees 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 elements of this document may be the subject of patent rights. ISO shall not
24、 be held responsible for identifying any or all such patent rights. ISO 4521 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 3, Electrodeposited coatings and related finishes. This second edition cancels and replaces the first edition (ISO 4521:
25、1985), and also ISO 4522-1:1985, ISO 4522-2:1985 and ISO 4522-3:1988, which have been technically revised. BS EN ISO 4521:2008ISO 4521:2008(E) ISO 2008 All rights reserved vIntroduction Electrodeposited silver and silver alloy coatings are often specified for their extremely good electrical conducti
26、vity, but corrosion protection is often an additional requirement for electrical, electronic and other applications. In many conditions of service, sulfide films may form on the coatings, increasing the contact resistance at the silver electroplated mating surface and making them unsuitable for use
27、in low-voltage electronic circuits. Sulfide films are not especially detrimental to other electronic applications where higher voltage and higher contact pressures are used, because the films are not completely insulating. Because the appearance and serviceability of electroplated silver coatings de
28、pend on the condition of the basis material, agreement should be reached between interested parties that the surface finish and roughness of the basis material are satisfactory for electroplating. Electroplated silver coatings have been used as bearing surfaces for many decades and are particularly
29、useful where the load-bearing surfaces are not well lubricated. Electroplated silver coatings have largely replaced electroplated gold coatings on metallic lead frames, the devices that support the majority of silicon chips. BS EN ISO 4521:2008BS EN ISO 4521:2008INTERNATIONAL STANDARD ISO 4521:2008(
30、E) ISO 2008 All rights reserved 1Metallic and other inorganic coatings Electrodeposited silver and silver alloy coatings for engineering purposes Specification and test methods WARNING This International Standard may not be compliant with some countries health and safety legislations and calls for t
31、he use of substances and/or procedures that may be injurious to health if adequate safety measures are not taken. This International Standard does not address any health hazards, safety or environmental matters and legislations associated with its use. It is the responsibility of the user of this In
32、ternational Standard to establish appropriate health, safety and environmentally acceptable practices, and take suitable actions to comply with any national and international regulations. Compliance with this International Standard does not, in itself, confer immunity from legal obligations. 1 Scope
33、 This International Standard specifies requirements for electroplated silver and silver alloy coatings for electrical, electronic and other engineering applications, including test methods. Engineering applications are defined as those in which the coating essentially serves a non-decorative purpose
34、. Although this International Standard does not specify the condition, finish or surface roughness of the basis material prior to electroplating, the appearance and serviceability of electroplated silver and silver alloy coatings depend on the condition of the basis material. It is essential that th
35、e purchaser specifies the surface finish and roughness of the basis material in order to conform to the product requirements. This International Standard does not apply to coatings on screw threads or to coatings on sheet, strip or wire in the non-fabricated form. 2 Normative references The followin
36、g 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 1463, Metallic and oxide coatings Measurement of coating
37、thickness Microscopical method ISO 2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness ISO 2080, Metallic and other inorganic coatings Surface treatment, metallic and other inorganic coatings Vocabulary ISO 2177, Metallic coatings Measureme
38、nt of coating thickness Coulometric method by anodic dissolution ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickness Magnetic method ISO 3497, Metallic coatings Measurement of coating thickness X-ray spectrometric methods BS EN ISO 4521:2008ISO 4521:2008(E) 2 ISO
39、2008 All rights reservedISO 3543, Metallic and non-metallic coatings Measurement of thickness Beta backscatter method ISO 3868, Metallic and other non-organic coatings Measurement of coating thicknesses Fizeau multiple-beam interferometry method ISO 4516, Metallic and other inorganic coatings Vicker
40、s and Knoop microhardness tests ISO 4518, Metallic coatings Measurement of coating thickness Profilometric method ISO 4519:1980, Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by attributes ISO 4538, Metallic coatings Thioacetamide corrosion test (TAA test
41、) ISO 9587, Metallic and other inorganic coatings Pretreatment of iron or steel to reduce the risk of hydrogen embrittlement ISO 9588, Metallic and other inorganic coatings Post-coating treatments of iron and steel to reduce the risk of hydrogen embrittlement ISO 10111, Metallic and other inorganic
42、coatings Measurement of mass per unit area Review of gravimetric and chemical analysis methods ISO 10289, Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates Rating of test specimens and manufactured articles subjected to corrosion tests ISO 10308, Metallic
43、coatings Review of porosity tests ISO 10587, Metallic and other inorganic coatings Test for residual embrittlement in both metallic-coated and uncoated externally-threaded articles and rods Inclined wedge method ISO 12687, Metallic coatings Porosity tests Humid sulfur (flowers of sulfur) test ISO 14
44、647, Metallic coatings Determination of porosity in gold coatings on metal substrates Nitric acid vapour test ISO 15724, Metallic and other inorganic coatings Electrochemical measurement of diffusible hydrogen in steels Barnacle electrode method IEC 60068-2-20, Basic environmental testing procedures
45、 Part 2: Tests. Test T: Soldering 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2064 and ISO 2080 apply. 4 Information to be supplied by the purchaser to the electroplater 4.1 Essential information The following information shall be supplied by the
46、 purchaser to the electroplater in writing, for example, in the purchase order or contract, or on engineering drawings: a) the number of this International Standard (ISO 4521) and the designation (see Clause 5); b) the significant surface indicated, for example, on drawings or by the provision of su
47、itably marked samples; BS EN ISO 4521:2008ISO 4521:2008(E) ISO 2008 All rights reserved 3c) the nature, condition and finish of the basis metal, if they are likely to affect the serviceability and/or the appearance of the coating; d) the position on the surface of unavoidable defects, such as rack m
48、arks (see 6.2); e) the finish required, for example, bright, dull or another type, preferably accompanied by approved samples of the finish (see 6.2); f) the requirements for thickness, accelerated corrosion and adhesion testing (see 6.3, 6.5 and 6.9); g) the tensile strength of parts and the requir
49、ements for heat treatment before and/or after electrodeposition (see 6.7 and 6.8); h) sampling methods, acceptance levels or any other inspection requirements if different from those specified in ISO 4519:1980, Clause 7. 4.2 Additional information If the following additional information is required, it shall be specified by the purchaser in writing, for example, in the contract, purchase order or on the drawing with the definition. a) the minimum silver conten
