SANS 2064-2008 Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness《金属及其他无机涂层 有关厚度测量的定义和惯例》.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 978-0-626-21913-0 SANS 2064:2008Edition 2ISO 2064:1996Edition 3SOUTH AFRICAN NATIONAL STANDARD Metallic and other inorganic coatings Definitions and

4、 conventions concerning the measurement of thickness This national standard is the identical implementation of ISO 2064:1996 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pr

5、etoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 2064:2008 Edition 2 ISO 2064:1996 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS TC 107, Metallic and other inorganic coatings, in acc

6、ordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in November 2008. This SANS document supersedes SABS ISO 2064:1980 (first edition). SANS 2064:2008This s tandard may only be used and printed by approved subs

7、cription and freemailing clients of the SABS .IS0 2064: 1996(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical co

8、mmittees. 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 the work. IS0 collab- orates closely with

9、 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 th

10、e member bodies casting a vote. International Standard IS0 2064 was prepared by Technical Committee ISOnC 107, Metallic and other inorganic coatings, Subcommittee SC 2, Methods of inspection and coordination of test methods. This third edition cancels and replaces the second edition (IS0 2064:1980),

11、 of which it constitutes a technical revision. 0 IS0 1996 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 from the pub

12、lisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SANS 2064:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .0 IS0 IS0 2064: 1996(E) Introduction An important

13、 requirement of most coating specifications is that the coating have a thickness not less than a given value (and in a few cases not greater than a given value). The method to be used for measuring the thickness of a particular coating is laid down in the coating specification. The main purpose of t

14、his International Standard is to define exactly what is meant by the term “minimum thickness” when used in specifications for metallic and related coatings. In this context, the minimum thickness is de- fined as a local thickness over a small area. With some methods, for example the microscopical me

15、thod, IS0 1463, it is possible to detect appreciable variations in thickness across extremely small areas (for example pits or cracks) which might be considered as places where the specified minimum thickness has not been achieved. However, with other test methods (for example the coulometric method

16、, IS0 2177:1985, Metallic coatings - Measurement of coating thickness - Coulometric method by anodic dissolution, or various non-destructive methods), such minute local variations in thickness cannot be detected. Therefore, the only practicable definition of minimum thickness is one that allows comp

17、arable results to be obtained by any of the approved test methods. Hence the minimum thickness should be a local thickness over an area that is as small as practicable, but not too small to accommodate any of the specified test methods. These areas are termed “reference areas” and are often large en

18、ough to accommodate a number of separate measurements by the chosen method. In order to obtain consistent results, especially with non-destructive tests, the mean of the measurements of such tests on the reference area should be taken as the local thickness. In practice, it is usually permissible to

19、 test the coating at any place on the significant surface in order to find the minimum thickness on an article. Articles are usually tested at areas where the coating may be expected to be thinnest and so the definition of minimum thickness is the lowest value of local thickness (as defined in claus

20、e 3) found by the chosen method. In the case of some coatings, such as hot-dipped and sprayed metal coat- ings, the coating specifications may call for compliance with a minimum lo- cal or an average thickness, or both. These may differ from the parameters defined in this International Standard and

21、the relevant product specifi- cations should be consulted. SANS 2064:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .This page intentionally left blank SANS 2064:2008This s tandard may only be used and printed by approved subscription and

22、 freemailing clients of the SABS .INTERNATIONAL STANDARD o IS0 IS0 2064: 1996(E) Metallic and other inorganic coatings - Definitions and conventions concerning the measurement of thickness 1 Scope This International Standard defines terms concerning the measurement of the thickness of metallic and o

23、ther inorganic coatings on any substrate. In addition, it specifies some general rules to be followed in the measurement of minimum thicknesses of coatings. 2 Normative references The following standard contains provisions which, through reference in this text, constitute provisions of this Internat

24、ional Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to in- vestigate the possibility of applying the most recent editions of the standard indicated below. M

25、embers of IEC and IS0 maintain registers of currently valid Inter- national Standards. IS0 1463:1982, Metallic and oxide coating - Meas- urement of coating thickness - Microscopical method. 3 Definitions For the purposes of this International Standard, the fol- lowing definitions apply. 3.1 signific

26、ant surface: The part of the article cov- ered or to be covered by the coating and for which the coating is essential for serviceability and/or appear- ance and where the coating must meet all of the speci- fied requirements. 3.2 measuring area: The area of the significant sur- face over which a sin

27、gle measurement is made. “Measuring area” for the following methods is defined as a) b) C) d) for analytical methods, the area over which the coating is removed; for the anodic dissolution method, the area en- closed by the sealing ring of the cell; for the microscopical method, the field of view at

28、 a specified magnification (see IS0 1463); for non-destructive methods, the probe area or the area influencing the reading (see also the Introduc- tion). 3.3 reference area: The area within which a speci- fied number of single measurements is required to be made. 3.4 local thickness: The mean of the

29、 thickness measurements, of which a specified number is made within a reference area (see also the Introduction). 3.5 minimum local thickness: The lowest value of the local thicknesses found on the significant surface of a single article (see also the Introduction). 3.6 maximum local thickness: The

30、highest value of the local thicknesses found on the significant surface of a single article. 3.7 average thickness: Either the value obtained by analytical methods (see 5.1) or the mean of a specified number of local thickness measurements that are evenly distributed over the significant surface (se

31、e 5.2 and also the Introduction). NOTE - In the case of components coated in bulk, the product specification may require determination of the value of the average thickness of a bath. In such cases the stan- dard deviation must be known to be able to estimate the pro- portion of the batch that is be

32、low the thickness in question. SANS 2064:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .IS0 2064: 1996(E) 0 IS0 4 Determination of local thickness large enough to provide a mass loss that can be deter- Average thickness measurements are

33、usually made on small articles of limited total surface area. 4.1 Articles with significant surfaces less than 1 cm* The normal reference area to be used for determining the local thickness shall be the whole of the significant surface of the article. The number of single meas- urements to be made w

34、ithin this reference area shall be agreed between the parties concerned. In special cases, however, smaller reference areas may be taken, but their sizes, number and location shall be agreed between the parties concerned. mined with sufficient accuracy by the weighing method used. If the area of the

35、 significant surface of the coated article is less than the required minimum measuring area, a number of individual articles shall be selected to provide the measuring area required for a single de- termination and the result shall be regarded as the average thickness. If the area of the significant

36、 surface of the coated article does not greatly exceed the required minimum measuring area, a single determination on that article shall be regarded as the average thickness for the article. At least two articles shall be measured in order 4.2 Articles with significant surfaces greater than 1 cm* -

37、The local thickness shall be determined within a ref- erence area of approximately 1 cm2 (where possible, a square of 1 cm side). Up to five distributed measure- ments may be made within this reference area (depen- dent upon the measuring method used) and the number to be made shall be agreed betwee

38、n the par- ties concerned. to verify the accuracy of the measurement. If the area of the significant surface of the coated articles markedly exceeds the required minimum measuring area, a specified number of replicate deter- minations, distributed over the significant surface, shall be carried out a

39、nd reported separately. 5.2 Other methods 4.3 Microscopical method When using the microscopical method specified in IS0 1463, at least five distributed measurements shall be made along a length) of a specified microsection. If the area of the significant surface of the coated article does not greatl

40、y exceed the reference area for determining local thickness (see clause 4) the value of the local thickness shall be taken as the average thick- ness. 5 Determination of average thickness If the area of the significant surface of the coated article markedly exceeds the reference area for deter- mini

41、ng local thickness (see clause 4), the average thickness shall be taken as the mean of three to five lo- cal thickness determinations distributed over the sig- nificant surface. 5.1 Analytical methods When using mass-loss methods for determining av- erage thickness, the selected measuring area shall

42、 be 1) For electroplated coatings this length may conveniently be 5 mm, but for for example anodic oxide coatings, this length may be 20 mm. coatings that tend to be more uniform in thickness, 2 SABSSANS 2064:2008 SABSThis s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .