ISO-2177-2003.pdf
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1、 Reference number ISO 2177:2003(E) ISO 2003 INTERNATIONAL STANDARD ISO 2177 Third edition 2003-03-15 Metallic coatings Measurement of coating thickness Coulometric method by anodic dissolution Revtements mtalliques Mesurage de lpaisseur Mthode coulomtrique par dissolution anodique ISO 2177:2003(E) P
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5、3 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 either ISO at the address below or ISOs member body in the coun
6、try 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 2003 All rights reserved ISO 2177:2003(E) ISO 2003 All rights reserved iii Contents Page Forewordiv 1 Scop
7、e1 2 Normative references .1 3 Terms and definitions.1 4 Principle.2 5 Instrumentation.2 6 Electrolyte2 7 Factors affecting the measuring accuracy.3 7.1 Coating thickness .3 7.2 Current variation .3 7.3 Area variation 3 7.4 Agitation (if required)4 7.5 Alloy layer between coating and substrate4 7.6
8、Purity of coatings4 7.7 Condition of test surface4 7.8 Density of coating material4 7.9 Cleanliness of the cell 4 7.10 Cleanliness of electrical connections.4 7.11 Calibration standards (if used)4 7.12 Non-uniform dissolution 5 8 Procedure.5 8.1 General.5 8.2 Preparation of test surface.5 8.3 Cell a
9、pplication5 8.4 Electrolysis5 8.5 Undercoats.5 8.6 Examination after test.6 8.7 Coatings on cylindrical specimens.6 9 Expression of results6 10 Measurement uncertainty.7 11 Test report7 Annex A (informative) Typical electrolytes8 Annex B (informative) Types of instrument.13 -,-,- ISO 2177:2003(E) iv
10、 ISO 2003 All rights reserved Foreword 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 interes
11、ted 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. ISO collaborates closely with the International Electrotechnical C
12、ommission (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 tech
13、nical 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 elements of this document may be the subject of patent rights. ISO
14、shall not be held responsible for identifying any or all such patent rights. ISO 2177 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coatings, Subcommittee SC 2, Test methods. This third edition cancels and replaces the second edition (ISO 2177:1985), which has been tec
15、hnically revised. -,-,- INTERNATIONAL STANDARD ISO 2177:2003(E) ISO 2003 All rights reserved 1 Metallic coatings Measurement of coating thickness Coulometric method by anodic dissolution 1 Scope This International Standard describes a coulometric method, by anodic dissolution, for measuring the thic
16、kness of metallic coatings. It is only applicable to conductive coatings. Typical combinations of coatings and substrates that can be tested by this method are given in Table 1. Other combinations may be tested with electrolytes in current use (see Annex A), or new electrolytes may be developed for
17、them but, in both cases, it is necessary to verify the suitability of the complete system. This International Standard is also applicable to multi-layer systems, e.g Cu-Ni-Cr (see also 8.5). It may be used to measure the thickness of coatings applied by various means, if due account is taken of spec
18、ial features such as the presence of an alloy layer. In some cases, the presence and thickness of diffusion layers can also be measured. It can also be used to measure the thickness of coatings on cylindrical specimens and wires (see 8.7). 2 Normative references The following referenced documents ar
19、e 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 2064:1996, Metallic and other inorganic coatings Definitions and conventions conce
20、rning the measurement of thickness ISO 2080, Surface treatment, metallic and other inorganic coatings Vocabulary 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 2064 and ISO 2080 as well as the following apply. 3.1 measuring area area of the signific
21、ant surface over which a single measurement is made NOTE The measuring area for this method is the area enclosed by the sealing ring of the cell. ISO 2177:2003(E) 2 ISO 2003 All rights reserved 4 Principle A well-defined area of the coating is subjected to anodic dissolution using a suitable electro
22、lyte. The virtually complete dissolution of the coating is detected by a change in cell voltage. The coating thickness is calculated from the quantity of electricity used, in coulombs, which in turn may be calculated from: a) the time interval between the start and the end of the test, if it is cond
23、ucted at constant current density; b) the integrated quantity of electricity used in dissolving the coatings. 5 Instrumentation 5.1 Suitable instruments can be constructed from readily available components but proprietary instruments are usually used (see Annex B). 5.2 Proprietary direct-reading ins
24、truments are available for use with electrolytes recommended by the manufacturer. Other instruments record the quantity of electricity, in coulombs, used in dissolving the coating from the measuring area (see 3.1), usually in arbitrary units, from which the thickness is calculated using factors or t
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