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1、INTERNATIONAL STANDARD ISO 15730 First edition 2000-12-15 Reference number ISO 15730:2000(E) ISO 2000 Metallic and other inorganic coatings Electropolishing as a means of smoothing and passivating stainless steel Revtements mtalliques et autres revtements inorganiques Polissage lectrolytique: procd
2、de brillantage (ou nivellement) et de passivation des aciers inoxydables ISO 15730:2000(E) ii ISO 2000 All rights reserved 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 ty
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6、photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs mem- ber 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 S
7、witzerland -,-,- ISO 15730:2000(E) ISO 2000 All rights reserved iii ContentsPage 1Scope .1 2Normative references .1 3Terms and definitions 1 4Information to be supplied by the purchaser to the finisher 2 5Requirements .2 6Sampling .4 7Test methods 4 8Test report 5 Annex ATypical electropolishing sol
8、ution and operating conditions7 Bibliography.8 -,-,- ISO 15730:2000(E) iv ISO 2000 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 normal
9、ly carried out through ISO technical com- mittees. 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 liai- son with ISO, also take part in
10、 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 3. Draft International Standards adopted by the tech
11、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 International Standard may be the subject of paten
12、t rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 15730 was prepared by Technical Committee ISO/TC 107,Metallic and other inorganic coatings, Subcommittee SC 8,Chemical conversion coatings. Annex A of this International Standard is
13、for information only. -,-,- ISO 15730:2000(E) ISO 2000 All rights reserved v Introduction Electropolishing removes a small but finite amount of metal from the surface that, in addition to smoothing and bright- ening, produces a hygienically clean surface desirable for use by manufacturers of food pr
14、ocessing and medical equipment. In addition to improved passivation, electropolishing provides many other benefits. Some examples are surface stress relief, removal of surface carbon and oxides and reduction of friction. Hydrogen embrittlement of articles is not produced during the electropolishing
15、process, which takes minutes to perform. The quality of passivation depends on the type of stainless steel, the formulation of the electropolishing solution and the conditions of operation. Free iron on the surface of the stainless steel is removed resulting in improved corrosion resistance. No furt
16、her chemical treatment is necessary in order to passivate the stainless steel surface. Surface smoothing obtained by electropolishing also improves passivation. -,-,- INTERNATIONAL STANDARDISO 15730:2000(E) ISO 2000 All rights reserved 1 Metallic and other inorganic coatings Electropolishing as a me
17、ans of smoothing and passivating stainless steel WARNING The use of this International Standard may involve hazardous materials, operations and equip- ment. This International Standard does not purport to address all the safety problems associated with its use. It is the responsibility of the user o
18、f this International Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Large quantities of hydrogen and oxygen gases are evolved at the electrodes during the electropolishing process. Proper ventilation procedures sh
19、ould be used to ensure their removal. Ignition of hydrogen gas can result in dangerous explosions. 1Scope This International Standard specifies the information to be supplied by the purchaser to the finisher, requirements and test methods for electropolishing as a means of smoothing and passivating
20、stainless steel alloys in the S2XXXX, S3XXXX and S4XXXX series, and the precipitation hardened alloys (see ISO/TR 15510 for information on composi- tion). 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this I
21、nternational Standard. For dated references, subsequent amendments to, or revisions of, any of these publica- tions do not apply. However, parties to agreements based on this International Standard are encouraged to investi- gate the possibility of applying the most recent editions of the normative
22、documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain reg- isters of currently valid International Standards. ISO 2064:1996,Metallic and other inorganic coatings Definitions and conventions concerning the
23、measurement of thickness. ISO 2080:1981,Electroplating and related processes Vocabulary. ISO 4519:1980,Electrodeposited metallic coatings and related finishes Sampling procedures for inspection by at- tributes. ISO 9227,Corrosion tests in artificial atmospheres Salt spray tests. ISO/TR 15510,Stainle
24、ss steels Chemical composition. ISO 16348:1),Metallic and other inorganic coatings Definitions and conventions concerning appearance. 3Terms and definitions For the purposes of this International Standard, the definitions given in ISO 2064, ISO 2080 and ISO 4519 (some of which are repeated below for
25、 convenience) and the following apply. 1)To be published. -,-,- ISO 15730:2000(E) 2 ISO 2000 All rights reserved 3.1 passivation rendering of a stainless steel surface into a lower state of chemical reactivity NOTEPassivated surfaces are characterized by the absence of free iron and the formation of
26、 a thin coherent oxide film. 3.2 electropolishing smoothing and brightening of a metal surface by making it anodic in an appropriate solution ISO 2080:1981 3.3 inspection lot collection of treated items that are of the same kind, that have been produced to the same specifications, that have been tre
27、ated by a single supplier at one time, or at approximately the same time, under essentially identical condi- tions and that are submitted for acceptance or rejection as a group Based on ISO 4519:1980, definition 3.7 3.4 significant surface part of the article covered or to be covered by the coating
28、and for which the coating is essential for serviceability and/or appearance and where the coating has to meet all of the specified requirements ISO 2064:1996 4Information to be supplied by the purchaser to the finisher When ordering articles smoothed and passivated in accordance with this Internatio
29、nal Standard, the purchaser shall provide the following information: a)the number of this International Standard, i.e. ISO 15730, the alloy designation number and the test method(s) to be used to evaluate the article (see clause 7); b)the appearance required. Alternatively, a sample showing the requ
30、ired finish shall be supplied or approved by the purchaser in accordance with ISO 16348 (see note 1); c)those areas on the article where electrical contact is acceptable; d)the dimensional tolerances, if any, to be stated in the ordering document (see note 2); e)any requirements for passivation test
31、ing (see 5.3 and clause 7); f)any requirement for the provision of a test report (see 5.4 and clause 8). NOTE 1When required, the basis material may be subjected, prior to electropolishing, to such mechanical polishing as may be required to yield the desired final surface characteristics. NOTE 2Typi
32、cally,toof metal are removed from the surface during electropolishing; however, up tomay be removed for additional smoothing. Greater amounts will be removed from corners and edges, i.e. areas of high current density, un- less shields and/or auxiliary cathodes are used. 5Requirements 5.1Visual defec
33、ts Where specified the significant surfaces of the article to be smoothed and passivated by electropolishing shall be free of clearly visible defects such as pits, roughness, striations or discoloration when examined with 20/20 eyesight at a distance of approximately. 5m10m50m 0,5 m -,-,- ISO 15730:
34、2000(E) ISO 2000 All rights reserved 3 NOTEDefects in the surface of the basis material such as scratches, porosity and inclusions can adversely affect the appear- ance and performance of the article. 5.2Process 5.2.1General The basis material may have to be subjected to preparatory operations, e.g.
35、 polishing and cleaning in order to re- move surface soil such as polishing compounds, oils, etc. 5.2.2Electropolishing Following any preparatory operations, the article(s) shall be introduced into the electropolishing solution for a period of time at the current density and temperature required to
36、produce the surface finish specified by the purchaser see b) of clause 4. NOTE 1Annex A describes a typical electropolishing solution and operating conditions suitable for many stainless steel alloys. NOTE 2Proprietary electropolishing solutions are available offering special features such as low sl
37、udging, better bright throwing power, longer life or better performance with specific stainless steel alloys. NOTE 3Intricately shaped articles may not receive the same degree of passivation in recessed areas due to low current densi- ties. By increasing the time and/or overall current density, or b
38、y using auxiliary cathodes, the electropolishing may be improved in such areas and subsequent passivation tests may be passed. 5.2.3Post treatment and rinsing The electropolishing process produces a residual surface film when withdrawn from the electropolishing solution that can adversely affect app
39、earance or performance. The film shall be removed either by: immersing the article in nitric acid solution ofvolume fraction tovolume fraction (relative density 1,42; mass fraction) at room temperature; or using several rinse stages. Neutralization procedures such as immersion in alkaline solutions
40、shall not be used as they have a tendency to “set” the residual surface film and detract from appearance and performance. The article shall be rinsed subsequently to remove all traces of acidified water that can affect the appearance and performance of the passive part. NOTEDe-ionized or distilled w
41、ater may be used to avoid water spots. 5.3Passivation testing 5.3.1When tested in accordance with 7.1, there shall be no evidence on the article of red rust or other visible prod- ucts resulting from the test. 5.3.2When tested in accordance with 7.2, there shall be no evidence on the article of red
42、rust or other visible prod- ucts resulting from the test. 5.3.3When tested in accordance with 7.3, there shall be no evidence on the article of red rust or other visible prod- ucts resulting from the test. 10 %30 % 70 % -,-,- ISO 15730:2000(E) 4 ISO 2000 All rights reserved 5.3.4Stainless steel allo
43、ys in the austenitic 200 series, austenitic 300 series and martensitic 400 series containing more thanchromium shall provide no evidence of a copper-coloured deposit and/or copper-coloured spots when tested in accordance with 7.4. 5.3.5Stainless steel alloys in the austenitic 200 series, austenitic
44、300 series and martensitic 400 series containing more thanchromium shall provide no evidence of the formation of a dark blue colour withinwhen tested in accordance with 7.5. 5.4Test report When specified in the purchase order see f) of clause 4, a report of the passivation test used (see clause 7) s
45、hall be supplied to the purchaser in accordance with clause 8. 6Sampling 6.1A random sample shall be selected from the inspection lot in accordance with ISO 4519. The items in the lot shall be inspected for conformity to the requirements of this specification and the lot shall be clas- sified as con
46、forming or nonconforming to each requirement in accordance with the sampling plans given in ISO 4519. NOTEISO 4519 describes four sampling plans for the original inspection of coated articles. Three are used where the test methods are nondestructive (i.e. the test method does not make the items nonc
47、onforming). The fourth plan is used where the test method is destructive. The purchaser should identify which test methods are destructive and which are nondestructive. Where both destruc- tive and nondestructive test methods exist to test the conformity of a finish to a particular requirement the p
48、urchaser should state which test method is to be used. 6.2If separate test specimens are used to represent the items in a test, the specimens shall be of the nature, size and number, and be processed, as required in accordance with the test methods of this specification. Unless a need can be demonstrated, separately prepared specimens shall not be used in place of production items for nondestructive tests and visual examination. NOTEFor destructive tests, separately prepared specimens may be used. 7Test m