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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 15730:2000 ICS 25.
2、220.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Metallic and other inorganic coatings Electropolishing as a means of smoothing and passivating stainless steel Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This
3、 British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 BSI 02-2001 ISBN 0 580 36945 5 BS ISO 15730:2000 Amendments issued since publication
4、 Amd. No.DateComments National foreword This British Standard reproduces verbatim ISO 15730:2000 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee STI/38, Chemical conversion coatings, which has the responsibility to: aid enqu
5、irers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations r
6、epresented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index
7、, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer
8、 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was l
9、ast issued. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATIONAL STANDARD ISO 15730 First edition 2000-12-15 Reference number ISO 15730:2000(E) Metallic and other inorganic coatings Electropolishing as a means of smoothing and passi
10、vating stainless steel Revtements mtalliques et autres revtements inorganiques Polissage lectrolytique: procd de brillantage (ou nivellement) et de passivation des aciers inoxydables Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:
11、2000(E) ii Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) iii ContentsPage 1Scope .1 2Normative references .1 3Terms and definitions 1 4Information to be supplied by the purchaser to the finisher 2 5Requirements .2 6Sampli
12、ng .4 7Test methods 4 8Test report 5 Annex ATypical electropolishing solution and operating conditions7 Bibliography.8 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) iv Foreword ISO (the International Organization for Stan
13、dardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical com- mittees. Each member body interested in a subject for which a technical committee has been established has the rig
14、ht to be represented on that committee. International organizations, governmental and non-governmental, in liai- son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Internation
15、al Standards are drafted in accordance with the rules 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 b
16、odies casting a vote. Attention is drawn to the possibility 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 15730 was prepared by Technical Commit
17、tee ISO/TC 107,Metallic and other inorganic coatings, Subcommittee SC 8,Chemical conversion coatings. Annex A of this International Standard is for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) v Introdu
18、ction 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 processing and medical equipment. In addition to improved passivation, electropolishin
19、g 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 process, which takes minutes to perform. The quality of passivation depends on the t
20、ype 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 further chemical treatment is necessary in order to passivate the stainless steel surfac
21、e. Surface smoothing obtained by electropolishing also improves passivation. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTERNATI
22、ONAL STANDARDISO 15730:2000(E) 1 Metallic and other inorganic coatings Electropolishing as a means 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
23、address all the safety problems associated with its use. It is the responsibility of the user of 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
24、evolved at the electrodes during the electropolishing process. Proper ventilation procedures should 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 finish
25、er, requirements and test methods for electropolishing as a means of smoothing and passivating 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 docu
26、ments contain provisions which, through reference in this text, constitute provisions of this International 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 enc
27、ouraged to investi- gate the possibility of applying the most recent editions of the normative 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.
28、ISO 2064:1996,Metallic and other inorganic coatings Definitions and conventions concerning the 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- trib
29、utes. ISO 9227,Corrosion tests in artificial atmospheres Salt spray tests. ISO/TR 15510,Stainless 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,
30、 the definitions given in ISO 2064, ISO 2080 and ISO 4519 (some of which are repeated below for convenience) and the following apply. 1)To be published. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) 2 3.1 passivation rend
31、ering 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 a thin coherent oxide film. 3.2 electropolishing smoothing and brightening of a metal surface by making it anodic in an appropriate
32、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 treated by a single supplier at one time, or at approximately the same time, under essentially identical condi- tions and that are submi
33、tted 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 and for which the coating is essential for serviceability and/or appearance and where the coating has to meet all of the specified re
34、quirements ISO 2064:1996 4Information to be supplied by the purchaser to the finisher When ordering articles smoothed and passivated in accordance with this International Standard, the purchaser shall provide the following information: a)the number of this International Standard, i.e. ISO 15730, the
35、 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 required finish shall be supplied or approved by the purchaser in accordance with ISO 16348 (see note 1); c)those areas on the article wh
36、ere 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 testing (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 bas
37、is material may be subjected, prior to electropolishing, to such mechanical polishing as may be required to yield the desired final surface characteristics. NOTE 2Typically,toof metal are removed from the surface during electropolishing; however, up tomay be removed for additional smoothing. Greater
38、 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 defects Where specified the significant surfaces of the article to be smoothed and passivated by electropolishing shall be free of clearly
39、 visible defects such as pits, roughness, striations or discoloration when examined with 20/20 eyesight at a distance of approximately. 5m10m50m 0,5 m Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) 3 NOTEDefects in the sur
40、face 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. polishing and cleaning in order to re- move surface soil suc
41、h 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 produce the surface finish specified by the purchaser see b)
42、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 sludging, better bright throwing power, longer life or better p
43、erformance 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 by using auxiliary cathodes, the electropolishing may be impro
44、ved 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 appearance or performance. The film shall be removed either by:
45、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 shall not be used as they have a tendency to “set” the residu
46、al 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 water may be used to avoid water spots. 5.3Passivation testing
47、 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 rust or other visible prod- ucts resulting from the test. 5.3
48、.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 % Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 26 11:39:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 15730:2000(E) 4 5.3.4Stainless
49、 steel alloys 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 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)