BS ISO 15726-2009 Metallic coatings and other inorganic coatings - Electrodeposited zinc alloys with nickel cobalt or iron《金属涂层和其它无机涂层 使用镍、钴或铁的电镀锌合金》.pdf

1、BS ISO15726:2009ICS 25.220.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMetallic and otherinorganic coatings Electrodepositedzinc alloys with nickel,cobalt or ironThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommi

2、ttee on 28 February2009 BSI 2009ISBN 978 0 580 60525 3Amendments/corrigenda issued since publicationDate CommentsBS ISO 15726:2009National forewordThis British Standard is the UK implementation of ISO 15726:2009.The UK participation in its preparation was entrusted to TechnicalCommittee STI/33, Elec

3、trodeposited and related coatings.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Stand

4、ard cannot confer immunityfrom legal obligations.BS ISO 15726:2009Reference numberISO 15726:2009(E)ISO 2009INTERNATIONAL STANDARD ISO15726First edition2009-02-01Metallic and other inorganic coatings Electrodeposited zinc alloys with nickel, cobalt or iron Revtements mtalliques et autres revtements i

5、norganiques Dpts lectrolytiques dalliages de zinc au nickel, cobalt ou fer BS ISO 15726:2009ISO 15726:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which

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10、g Published in Switzerland ii ISO 2009 All rights reservedBS ISO 15726:2009ISO 15726:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 2 4 Information to be supplied by the purchaser to the electroplater.

11、2 4.1 Essential information . 2 4.2 Additional information 3 5 Designation . 3 5.1 General. 3 5.2 Designation specification 3 5.3 Basis metal 3 5.4 Stress-relief heat treatment prior to electroplating. 4 5.5 Type and thickness of zinc alloy coating. 4 5.6 Chromate conversion coatings and other suppl

12、ementary treatments . 4 5.7 Hydrogen-embrittlement-relief heat treatment after electroplating. 5 5.8 Examples of coating designations 5 6 Requirements 5 6.1 Appearance . 5 6.2 Thickness 6 6.3 Adhesion 6 6.4 Porosity 6 6.5 Composition of coating 6 6.6 Corrosion performance in neutral salt spray.6 6.7

13、 Stress-relief heat treatments . 7 6.8 Hydrogen-embrittlement-relief heat treatments 7 7 Sampling 7 Annex A (normative) Thickness, adhesion and porosity tests . 8 Annex B (normative) Corrosion performance of zinc alloy coatings with chromate conversion and other supplementary treatments on steel in

14、neutral salt spray. 9 Bibliography . 12 BS ISO 15726:2009ISO 15726:2009(E) iv ISO 2009 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 nor

15、mally carried out through ISO technical committees. 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 non-governmental, in liaison with ISO, also take part in

16、the work. ISO collaborates closely with the International Electrotechnical Commission (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 prepar

17、e International Standards. 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 som

18、e 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 rights. ISO 15726 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 3, Electrodeposited coatings and r

19、elated finishes. BS ISO 15726:2009ISO 15726:2009(E) ISO 2009 All rights reserved vIntroduction Electrodeposited zinc alloy coatings containing nickel, cobalt or iron are significantly more corrosion-resistant than electrodeposited zinc coatings of equivalent thickness. The alloy coatings are anodic

20、to steel, but less so than pure zinc. Although originally developed for the continuous coating of steel for the fabrication of automobile body panels, zinc alloy electroplating processes have become available that are suitable for the rack and barrel electroplating of individual components. In the c

21、ase of zinc-nickel alloys, proprietary acid and alkaline electroplating processes exist that yield deposits with controlled nickel contents. Zinc-nickel coatings containing either 8 % or 12 % nickel are most widely used, and are often considered possible substitutes for cadmium coatings. Zinc-nickel

22、 alloy coatings can reportedly be applied by brush electroplating techniques. The alloy coatings are often used in combination with chromate conversion coatings, organic sealants and other supplementary treatments to further enhance corrosion resistance, and often serve as the base for applying orga

23、nic coatings. Chromate conversion coatings formulated specifically for use with zinc-cobalt and zinc-nickel alloy coatings are available for producing yellow- to bronze-coloured surfaces. BS ISO 15726:2009BS ISO 15726:2009INTERNATIONAL STANDARD ISO 15726:2009(E) ISO 2009 All rights reserved 1Metalli

24、c and other inorganic coatings Electrodeposited zinc alloys with nickel, cobalt or iron WARNING This International Standard may not be compliant with some countries health and safety legislation, and calls for the use of substances and/or procedures that may be injurious to health if adequate safety

25、 measures are not taken. This International Standard does not address any health hazards, safety or environmental matters and legislation associated with its use. It is the responsibility of the user of this International Standard to establish appropriate health, safety and environmentally acceptabl

26、e practices and take suitable actions to comply with any national and international regulations. Compliance with this International Standard does not of itself confer immunity from legal obligations. 1 Scope This International Standard covers the requirements for electrodeposited zinc alloy coatings

27、 containing either nickel, cobalt or iron. It provides a method of designating the electrodeposited coatings, chromate conversion coatings and other supplementary treatments. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated r

28、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness ISO 2080, Metallic and other inorga

29、nic coatings Surface treatment, metallic and other inorganic coatings Vocabulary ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for testing adhesion ISO 3882, Metallic and other inorganic coatings Review of methods of

30、 measurement of thickness ISO 4518, Metallic coatings Measurement of coating thickness Profilometric method ISO 4519, Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by attributes ISO 9587, Metallic and other inorganic coatings Pretreatment of iron or steel

31、 to reduce the risk of hydrogen embrittlement ISO 9588, Metallic and other inorganic coatings Post-coating treatments of iron or steel to reduce the risk of hydrogen embrittlement ISO 10308, Metallic coatings Review of porosity tests ISO 10309, Metallic coatings Porosity tests Ferroxyl test ASTM B11

32、7, Standard Practice for Operating Salt Spray (Fog) Apparatus BS ISO 15726:2009ISO 15726:2009(E) 2 ISO 2009 All rights reserved3 Terms and definitions For the purpose of this document, the terms and definitions in ISO 2064, ISO 2080, ISO 9587 and ISO 9588 apply. 4 Information to be supplied by the p

33、urchaser to the electroplater 4.1 Essential information When ordering articles to be electroplated in accordance with this International Standard, the purchaser shall provide the following information in writing, for example in the contract or purchase order, or on engineering drawings: a) the numbe

34、r of this International Standard (ISO 15726) and the article designation (see Clause 5); b) the significant surface to be electroplated, as indicated, for example, by drawings or by the provision of suitably marked samples and of any surfaces that are not to be electroplated; c) the nature, conditio

35、n and finish of the basis metal if they are likely to affect the serviceability and/or appearance of the coating; d) position, type, dimensions and number of unavoidable defects on the surface, such as rack marks, that can be tolerated (see 6.1); e) appearance of the zinc alloy coating, for example

36、as-deposited or with a chemical conversion coating and/or other supplementary treatment (see Clause 5 and 6.1); Alternatively, samples showing the appearance shall be supplied or approved by the purchaser and used for comparison purposes (see 6.1). f) type of chromate conversion coating or supplemen

37、tary treatment (see 5.6 and Annex B); Chromate conversion coatings shall only be omitted, and alternative conversion coatings and/or other supplementary treatments (see Table 3) or conformal coatings, such as lacquers, applied over the chromate coating, at the specific request of the purchaser. g) r

38、equirements for minimum thickness, additional portions of surfaces where the minimum thickness requirements apply, adhesion test and corrosion testing and its performance rating (see 6.2, 6.3, 6.6 and Annex B); h) the tensile strength of the parts and the requirements for stress- and embrittlement-r

39、elief heat treatments before and/or after electrodeposition (see 6.7 and 6.8); i) method of porosity testing (see Annex A), and the number and location of acceptable pores (see 6.4); j) sampling methods, acceptance levels or any other inspection requirements, if different from those given (see Claus

40、e 7); k) any other relevant information. BS ISO 15726:2009ISO 15726:2009(E) ISO 2009 All rights reserved 34.2 Additional information The following additional information, as relevant, shall also be provided: a) any cleaning precautions to be followed (see Note in 6.1); b) any special pre- and/or pos

41、t-plating treatments (see Note in 6.1). 5 Designation 5.1 General The article designation shall appear on engineering drawings, in the purchase order, in the contract or in the detailed product specification. The designation specifies the basis material, the requirements for stress relief before ele

42、ctroplating, the nominal composition and thickness of the zinc alloy coating, the type of chromate or other conversion coatings and other supplementary treatments, and the type of heat treatment to reduce susceptibility to hydrogen embrittlement. 5.2 Designation specification The designation shall c

43、omprise the following, in the order given: a) the term “Electrodeposited coating”; b) the number of this International Standard, ISO 15726; c) a hyphen; d) the chemical symbol of the basis metal; e) a solidus (/); f) if relevant, any SR designation (see 5.4); g) the chemical symbol for the metal or

44、alloy or coating, its composition in parentheses, and its thickness, in micrometres (see 5.5), separated by solidi (/) for each stage in the coating sequence in the order of application, if more than one; h) a solidus (/); i) if appropriate, codes indicating the type of any supplementary coating (se

45、e 5.6), followed by a solidus (/); j) if appropriate, codes designating any supplementary treatments (see 5.6); k) ER designation (see 5.7). 5.3 Basis metal The basis metal shall be designated by its chemical symbol, or its principal constituent, if an alloy. For example: Fe for iron and steel; Zn f

46、or zinc alloys; Cu for copper and copper alloys; and Al for aluminium and aluminium alloys. The specific alloy may be identified by its standard designation (for example its UNS number or its national or regional equivalent) placed between the symbols , for example Fe (see Reference 19). NOTE Electr

47、odeposited zinc alloys with nickel, cobalt or iron are most often applied to steel, but can be electrodeposited on other basis metals. BS ISO 15726:2009ISO 15726:2009(E) 4 ISO 2009 All rights reserved5.4 Stress-relief heat treatment prior to electroplating Stress-relief heat treatment prior to coati

48、ng may be required for some basis materials. Brackets shall be placed around the letters SR, the temperature, in Celsius, and the time, in hours. The temperature shall be in parentheses after the letters SR; for example SR(210)1. 5.5 Type and thickness of zinc alloy coating The electrodeposited zinc

49、 alloy coating shall be designated by the chemical symbols given in Table 1 followed by a number in parentheses giving the composition of the alloy coating within 0,5 % mass fraction (w), followed by a number giving the minimum local thickness of the coating, in micrometres. For example, ZnNi(12)5 designates a zinc alloy coating containing 12 % nickel that is 5 m thick. Table 2 gives typical thickness values specified for zinc alloy coatings deposited on steel, as guidance. Table 1 Symbols for elect