ISO-15721-2001.pdf
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1、Reference number ISO 15721:2001(E) ISO 2001 INTERNATIONAL STANDARD ISO 15721 First edition 2001-04-15 Metallic coatings Porosity tests Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour Revtements mtalliques Essais de porosit Porosit des revtements dor ou de palladium par
2、 essai lacide sulfureux/vapeur de dioxyde de soufre Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproduction or networking permitted without license from IHS -
3、,-,- ISO 15721:2001(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 are embedded are licensed to and installed on the computer performing the editing. In
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6、ess given below. ISO 2001 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
7、 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.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reserved Copyright International Organization for Standardization Pr
8、ovided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15721:2001(E) ISO 2001 All rights reservediii ContentsPage Foreword.iv Introduction.v 1Scope 1 2Normat
9、ive references1 3Terms and definitions .2 4Apparatus.2 5Reagents.2 6Safety hazards2 7Procedure.3 8Examination4 9Precision.5 10Test report5 Annex A (informative) Significance and use 6 Bibliography7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licens
10、ee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15721:2001(E) iv ISO 2001 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of nati
11、onal 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 committee. Internat
12、ional 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 accordance with the ru
13、les given in the ISO/IEC Directives, Part 3. 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 po
14、ssibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 15721 was prepared by Technical Committee ISO/TC 107, Metallic and other inorganic coati
15、ngs, Subcommittee SC 7, Corrosion tests. Annex A of this International Standard is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproducti
16、on or networking permitted without license from IHS -,-,- ISO 15721:2001(E) ISO 2001 All rights reservedv Introduction The test method makes use of concentrated sulfurous acid (H2SO3), which emits sulfur dioxide (SO2) gas according to the equilibrium reaction: H2SO3= SO2+ H2O WARNING The sulfur diox
17、ide gas that is released by the sulfurous acid is toxic, corrosive and irritating. The sulfurous acid shall only be handled and used in a fume cupboard. Prior to starting the test, suitable preparation shall be made to dispose of approximately 200 ml to 500 ml of sulfurous acid used in the test. The
18、 procedure is similar to one first proposed by Lee and Ternowski 4. Exposure periods may vary, depending upon the degree of porosity to be revealed. Reaction of the gas with a corrodible base metal at pore sites produces reaction products that appear as discrete spots on the gold or palladium surfac
19、e. Individual spots are counted with the aid of a lens or low-power stereomicroscope. This test method is suitable for coatings containing 95 % or more of gold or palladium on substrates of copper, nickel and their alloys which are commonly used in electrical contacts. This test is considered destru
20、ctive because it reveals the presence of porosity by contaminating the surface with corrosion products and it undercuts the coating at pore sites or at the boundaries of the unplated areas. Any parts exposed to this test shall not be placed in service. The present test method is capable of detecting
21、 virtually all porosity or other defects that could participate in corrosion reactions with the substrate or underplate. The test is rapid, simple and inexpensive. In addition, it can be used on contacts with a complex geometry such as pin-sockets (it may be useful to open contact structures with de
22、ep recesses to permit reaction of the sulfur dioxide with the interior significant surfaces). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproduction or netwo
23、rking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 08:51:19 MDTNo reproduction or networking permitted without license from IHS -,-,-
24、INTERNATIONAL STANDARDISO 15721:2001(E) ISO 2001 All rights reserved1 Metallic coatings Porosity tests Porosity in gold or palladium coatings by sulfurous acid/sulfur dioxide vapour WARNING This International Standard does not purport to address all of the safety concerns, if any, associated with it
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