ASTM B912 PDF

Electropolishing and Passivation Standards. Able Electropolishing meets the high standards of the American Society for Testing and Materials ASTM , including those for stainless steel passivation using electropolishing. The ASTM B electropolishing specification outlines the electropolishing process for stainless steel alloys. This type of stainless steel passivation includes , and series alloys and is superior to standard chemical passivation.

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A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. Scope 1. NOTE 1Surface passivation occurs simultaneously with electropolish- ing under proper operating conditions.

The quality of passivation will depend on the type of stainless steel, the formulation of the electropol- ishing solution, and the conditions of operation. Free iron on the surface of the stainless steel is removed resulting in improved corrosion resis- tance. Surface smoothing obtained by electropolishing will also improve corrosion resistance. Electropolishing will also remove heat tint and oxide scale. No other units of measurement are included in this standard. This specication does not purport to address all of the safety concerns, if any, associated with its use.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and deter- mine the applicability of regulatory limitations prior to use. Referenced Documents 2. Terminology 3. Ordering Information 4. Current edition approved April 1, Published April Originally approved in Last previous edition approved in as B DOI: No further reproductions authorized.

Unless otherwise specied by the purchaser, a bright luster shall be acceptable. Alternatively, samples showing the required nish, or range of nish, shall be supplied or approved by the purchaser. When required, the basis material may be subjected, before electrop- olishing, to such mechanical polishing as may be required to yield the desired nal surface characteristics. The location of electrical contact marks shall be agreed upon between purchaser and supplier. As much as 50 m may be removed for additional smoothing.

The ordering document shall include the maximum amount of metal to be removed. Product Requirements 5. NOTE 2Defects in the surface of the basis material such as scratches, porosity, inclusions, and so forth, may adversely affect the appearance and performance of the article. Visible examination shall include wearing correctional glasses if the inspector normally wears them. NOTE 3A typical electropolishing solution and operating conditions suitable for many stainless steel alloys is shown in Appendix X1.

Proprietary electropolishing solutions are available offering special fea- tures such as low sludging, better bright throwing power, longer life, or better performance with specic stainless steel alloys. NOTE 4Intricately shaped articles may not receive the same degree of passivation in recessed area as a result of low-current densities. Increasing time or overall current density, or both, or the use of auxiliary cathodes, may be used to improve electropolishing in these areas and to pass subsequent passivation tests.

The use of other mineral acids, such as sulfuric or hydrochlo- ric acids, is not recommended as the passive lm may be compromised. Neutralization procedures such as immersion in alkaline solutions should not be used as they can have a tendency to set the residual lm and detract from appearance and performance. Deionized or distilled water may be used to avoid water spots.

Test Procedures 6. Failure is indicated by the presence of red rust or staining as a result of the presence of free iron on the surface. The article is swabbed with an acidied solution of copper sulfate. Failure is indicated by the presence of a copper-colored deposit or copper-colored spots, or both. This test is not to be used on martensitic series stainless steels. The article is swabbed with a solution of potassium ferricyanide. Failure is indicated by the presence of a dark blue color within 30 s.

Sampling Requirements 7. The articles in the lot shall be inspected for conformance to the requirements of this specication and the lot shall be classied as conforming or not conforming to each requirement accord- ing to the criteria of the sampling plans in Test Method B The fourth plan is used when the test method is destructive.

If it is not clear whether the test is destructive or nondestruc- tive, the purchaser should identify which test methods are destructive and which are nondestructive. In some instances, both destructive and nonde- structive test methods may exist for the testing of the conformance of a nish to a particular requirement.

The purchaser should state which is to be used. Unless a need can be demonstrated, sepa- rately prepared specimens shall not be used in place of production articles for nondestructive tests and visual exami- nation. For destructive tests, separately prepared specimens may be used. Rejection and Rehearing 8. Rejection should be reported to the producer or supplier promptly and in writing.

In case of dissatisfaction with test results, the producer or supplier may make a claim for a rehearing. Certication 9. When specied in the purchase order or contract, a report of the test results shall be furnished. Packaging Test Report Keywords The formation of a copper-colored deposit or copper-colored spots or both indicates failure.

Parts used for testing should be discarded or reprocessed. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

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Search inside document. Designation: B 02 Reapproved 1 Standard Specication for Passivation of Stainless Steels Using Electropolishing 1 This standard is issued under the xed designation B; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

Parveen Kohli. Nitasana Silaporn. Mahesh Kumar. Brayan Bch. Graciele Soares. Graciane Taglietti. Richard Wilson. Waqas Waqas. Gustavo Suarez. Akhilesh Kumar. Amit Pandita.

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Standard Specification for Passivation of Stainless Steels Using Electropolishing

A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. Scope 1. NOTE 1Surface passivation occurs simultaneously with electropolish- ing under proper operating conditions.

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The quality of passivation will depend 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. Surface smoothing obtained by electropolishing will also improve corrosion resistance. Electropolishing will also remove heat tint and oxide scale. No other units of measurement are included in this standard.

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ASTM B912 Electropolishing Standard for Stainless Steel Alloys

Historical Version s - view previous versions of standard. More B This specification covers the passivation by electropolishing of stainless steel alloys in the , , and series, as well as precipitation-hardened alloys. Basis materials shall be free of clearly visible defects, and if necessary, shall undergo preparatory cleaning procedures prior to electropolishing. Post-coating procedures such as post dip and final rinsing shall be performed as well. The performance of the specimens during passivation shall be evaluated by one or more of the following procedures: water immersion test; humidity test; salt spray test; copper sulfate test; and modified ferroxyl test for free iron. This abstract is a brief summary of the referenced standard.

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