SANS 6158-2007 Metallic coatings - Electrodeposited coatings of chromium for engineering purposes《金属镀层 工程用铬电镀层》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-19110-8 SANS 6158:2007Edition 2ISO 6158:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Metallic coatings Electrodeposited coatings of chromi

4、um for engineering purposes This national standard is the identical implementation of ISO 6158:2004 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7

5、911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 6158:2007 Edition 2 ISO 6158:2004 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA SC 5120.40A, Metallic and other ino

6、rganic coatings Electroplated coatings, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard was published in March 2007. This SANS edition cancels and replaces the first SABS edition (SABS ISO 6158:1984). Reference numberISO 615

7、8:2004(E)ISO 2004INTERNATIONAL STANDARD ISO6158Second edition2004-05-15Metallic coatings Electrodeposited coatings of chromium for engineering purposes Revtements mtalliques Dpts lectrolytiques de chrome pour usages industriels SANS 6158:2007This s tandard may only be used and printed by approved su

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11、inform the Central Secretariat at the address given below. ISO 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing fr

12、om either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reservedSANS 6158:2007Th

13、is s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) ISO 2004 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 to the electr

14、oplater .2 5 Designation 3 6 Requirements 5 7 Sampling 8 Annex A (informative) Typical thickness of chromium specified in engineering applications 9 Annex B (informative) Thickness test methods for electroplated chromium and other metallic coatings . 10 Annex C (normative) Determination of cracks an

15、d pores in chromium coatings . 11 Bibliography . 12 SANS 6158:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) iv ISO 2004 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide

16、 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 has the right to be represented on that

17、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. International Standards are drafted in acc

18、ordance 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. Publication as an International Standard requ

19、ires 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 rights. ISO 6158 was prepared by Technica

20、l 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 6158:1984), which has been technically revised. SANS 6158:2007This s tandard may only be used and printed

21、by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) ISO 2004 All rights reserved vIntroduction Electrodeposited chromium coatings are frequently deposited from hexavalent chromium solutions similar to those used for decorative electroplating. Engineering chromium coatings,

22、 however, are generally thicker than decorative ones. Regular or conventional chromium is the type most frequently specified, but porous, cracked or specially profiled surfaces and duplex chromium are also applied to achieve oil-retaining or non-sticking surfaces, or to improve corrosion resistance.

23、 Electrodeposited chromium coatings for engineering applications are most often applied directly to the basis metal to increase wear and abrasion resistance, to increase fretting resistance, to reduce static and kinetic friction, to reduce galling and seizing, to increase corrosion resistance, and t

24、o build up undersize or worn parts. For protection against severe corrosion, nickel and other metallic undercoats may be applied prior to the electrodeposition of chromium, or the corrosion resistance of the chromium coating may be increased by alloying, e.g., with molybdenum. SANS 6158:2007This s t

25、andard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 6158:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 6158:2004(E) ISO 2004 All rights reserved 1Metallic coa

26、tings Electrodeposited coatings of chromium for engineering purposes 1 Scope This International Standard specifies requirements for electroplated coatings of chromium, with or without undercoats, on ferrous and non-ferrous metals for engineering purposes. The coating designation provides a means of

27、specifying the thickness of chromium appropriate for typical engineering applications. 2 Normative references 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

28、 the referenced document (including any amendments) applies. ISO 1463, Metallic and oxide coatings Measurement of coating thickness Microscopical method ISO 2064, Metallic and other inorganic coatings Definitions and conventions concerning the measurement of thickness ISO 2079, Surface treatment and

29、 metallic coatings General classification of terms ISO 2080, Electroplating and related processes Vocabulary ISO 2177, Metallic coatings Measurement of coating thickness Coulometric measurement by anodic dissolution ISO 2178, Non-magnetic coatings on magnetic substrates Measurement of coating thickn

30、ess Magnetic method ISO 2819, Metallic coatings on metallic substrates Electrodeposited and chemically deposited coatings Review of methods available for testing adhesion ISO 3543, Metallic and non-metallic coatings Measurement of thickness Beta backscatter method ISO 3882, Metallic and other inorga

31、nic coatings Review of methods of measurement of thickness ISO 4516, Metallic and other inorganic coatings Vickers and Knoop microhardness tests ISO 4519, Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by attributes ISO 4526, Metallic coatings Electroplate

32、d coatings of nickel for engineering purposes ISO 9220, Metallic coatings Measurement of coating thickness Scanning electron microscope method ISO 9587, Metallic and other inorganic coatings Pretreatments of iron or steel to reduce the risk of hydrogen embrittlement SANS 6158:2007This s tandard may

33、only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) 2 ISO 2004 All rights reservedISO 9588, Metallic and other inorganic coatings Post-coating treatments of iron or steel to reduce the risk of hydrogen embrittlement ISO 10309, Metallic coatings Por

34、osity tests Ferroxyl test 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 12686, Metallic and other inorganic coatings Automated controlled shot-peening of metallic a

35、rticles prior to nickel, autocatalytic nickel or chromium plating, or as a final finish ISO 15724, Metallic and other inorganic coatings Electrochemical measurement of diffusible hydrogen in steels Barnacle electrode method EN 12508, Corrosion protection of metals and alloys Surface treatment, metal

36、lic and other inorganic coatings Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2064, ISO 2079, ISO 2080 and EN 12508 apply. 4 Information to be supplied to the electroplater 4.1 Essential information When ordering articles to be electrop

37、lated in accordance with this International Standard, the purchaser shall provide the following information in writing, e.g., in the contract or purchase order, or on engineering drawings. a) The designation (see Clause 5). b) The requirements for special test specimens (see 6.1). c) The significant

38、 surface, indicated by drawings of the articles or by suitably marked samples (see 6.2). d) The appearance and surface finish of the chromium coating, e.g., as-plated, ground or machined (see 6.2 and 6.3). Alternatively, samples showing the appearance and required finish shall be supplied or approve

39、d by the purchaser, and used for comparison purposes (see 6.2). e) The type, size and number of defects that can be tolerated (see 6.2). f) Additional portions of the surface where minimum thickness requirements apply (see 6.4). g) The test method to be used to measure thickness (see 6.4). h) The ad

40、hesion and porosity requirements, and test methods (see 6.6 and 6.7, respectively). i) The tensile strength of parts and the requirement for stress-relief heat treatment before electroplating (see 6.8). j) Requirements for any embrittlement relief heat treatment after electroplating, and for hydroge

41、n embrittlement testing (see 6.9). k) The sampling plan and acceptance levels (see Clause 7). SANS 6158:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) ISO 2004 All rights reserved 34.2 Additional information The followin

42、g additional information may be provided, when appropriate: a) the nominal composition or specification, and metallurgical condition of the basis metal including hardness (see 5.3); NOTE In the case of reclaimed articles, it may not be possible to supply this information, and it may, therefore, be d

43、ifficult to guarantee the quality of the coating. b) any special requirements for, or restrictions on, pre-treatment, e.g., vapour blasting instead of acid pre-treatment; c) where applicable, any special requirements for adhesion (see 6.6); d) the necessity for any treatment to induce compressive st

44、ress, e.g.; peening before or after electroplating (see 6.10); e) requirements for undercoats (see 5.5 and 6.11) and stripping (see 6.12). 5 Designation 5.1 General The designation shall appear on engineering drawings, in the purchase order, the contract or in the detailed product specification. The

45、 designation specifies, in the order given, the basis metal, the specific alloy (optional), stress relief requirements, the type and thickness of undercoats, the type and thickness of the electroplated chromium coating, and post-treatments such as heat treatment to reduce susceptiblity to hydrogen e

46、mbrittlement. 5.2 Components The designation shall comprise the following: a) the term, “Electrodeposited coating“; b) the number of this International Standard, i.e. ISO 6158; c) a hyphen; d) the chemical symbol of the basis metal (see 5.3); e) a solidus (/); f) symbols for the chromium coating, as

47、 well as coatings applied prior to chromium electroplating, separated by solidi for each stage in the coating sequence in the order of application. The coating designation shall include the thicknesses of the coatings in micrometres, as well as heat treatment requirements (see 5.4). Double solidi or

48、 separators (/) shall be used to indicate that a step has been omitted or is not a requirement. NOTE It is recommended that the specific alloy be identified by its standard designation following the chemical symbol of the basis metal; e.g., its UNS number, or the national or regional equivalent may

49、be placed between the symbols . EXAMPLE Fe is the UNS designation for a high-strength steel. See 1 to 7. SANS 6158:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6158:2004(E) 4 ISO 2004 All rights reserved5.3 Designating the basis metal The basis metal shall be designated by its chemical symbol or, if an alloy, its principal constituent. For example: a) Fe for iron and steel; b) Zn for zinc alloys; c) Cu f