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ASTM B912-02

(Specification)

Standard Specification for Passivation of Stainless Steels Using Electropolishing

Standard Specification for Passivation of Stainless Steels Using Electropolishing

SCOPE
1.1 This specification covers the passivation of stainless steel alloys in the 200 (UNS2XXXX), 300 (UNS3XXXX), and 400 (UNS4XXXX) series, and the precipitation-hardened alloys, using electropolishing procedures.
Note 1—Surface passivation occurs simultaneously with electropolishing under proper operating conditions. 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.
1.2 This specification may involve hazardous materials, operations, and equipment. This specification 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 determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
09-Sep-2002
ICS
49.040 - Coatings and related processes used in aerospace industry
Technical Committee
B08 - Metallic and Inorganic Coatings
Drafting Committee
B08.07 - Conversion Coatings
Current Stage
Ref Project

Relations

Replaces
ASTM B912-00 - Standard Specification for Passivation of Stainless Steels Using Electropolishing
Effective Date
10-Sep-2002
Replaced By
ASTM B912-02(2008)e1 - Standard Specification for Passivation of Stainless Steels Using Electropolishing
Effective Date
01-Apr-2008
Referred By
ASTM A967/A967M-17 - Standard Specification for Chemical Passivation Treatments for Stainless Steel Parts
Effective Date
10-Sep-2002
Referred By
ASTM F86-21 - Standard Practice for Surface Preparation and Marking of Metallic Surgical Implants
Effective Date
10-Sep-2002
Referred By
ASTM F1089-18 - Standard Test Method for Corrosion of Surgical Instruments
Effective Date
10-Sep-2002

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ASTM B912-02 - Standard Specification for Passivation of Stainless Steels Using ElectropolishingASTM B912-02 - Standard Specification for Passivation of Stainless Steels Using Electropolishing
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ASTM B912-02 - Standard Specification for Passivation of Stainless Steels Using Electropolishing
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 912 – 02
Standard Specification for
1
Passivation of Stainless Steels Using Electropolishing
This standard is issued under the fixed designation B 912; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope ISO 4519 Electrodeposited Metallic Coatings and Related
Finishes—Sampling Procedures for Inspection by At-
1.1 This specification covers the passivation of stainless
6
tributes
steel alloys in the 200 (UNS2XXXX), 300 (UNS3XXXX), and
ISO 9227 Corrosion Tests in Artificial Atmospheres—Salt
400 (UNS4XXXX) series, and the precipitation-hardened al-
6
Spray Tests
loys, using electropolishing procedures.
ISO/DIS 15730 Metallic and Other Inorganic Coatings—
NOTE 1—Surfacepassivationoccurssimultaneouslywithelectropolish-
Electropolishing as a Means of Smoothing and Passivat-
ing under proper operating conditions. The quality of passivation will
6,7
ing Stainless Steels
depend on the type of stainless steel, the formulation of the electropol-
ISO/DIS 16348 Metallic and Other Inorganic Coatings—
ishing solution, and the conditions of operation. Free iron on the surface
6
Definitions and Conventions Concerning Appearance
of the stainless steel is removed resulting in improved corrosion resis-
tance. Surface smoothing obtained by electropolishing will also improve
3. Terminology
corrosion resistance. Electropolishing will also remove heat tint and oxide
scale.
3.1 Definition of terms in this specification can be found in
Terminology B 374 and ISO 2080.
1.2 This specification may involve hazardous materials,
3.2 Definitions:
operations, and equipment. This specification does not purport
3.2.1 passivation, n—The rendering of a stainless steel
to address all of the safety concerns, if any, associated with its
surface into a lower state of chemical reactivity.
use. It is the responsibility of the user of this standard to
3.2.1.1 Discussion—Passivated surfaces are characterized
establish appropriate safety and health practices and deter-
by the absence of free iron, as defined by Practice A 380.
mine the applicability of regulatory limitations prior to use.
3.2.2 electropolishing, n—the electrochemical process in
2. Referenced Documents
which the article(s) to be passivated are treated anodically in a
suitable acid medium.
2.1 ASTM Standards:
A 380 Practice for Cleaning and Descaling Stainless Steel
2 4. Ordering Information
Parts, Equipment, and Systems
4.1 When ordering articles to be electropolished in con-
A 967 Specification for Chemical Passivation Treatments
2
formance with this standard, the purchaser shall state the
for Stainless Steel Parts
3
following:
B 117 Practice for Operating Salt Spray (Fog) Apparatus
4
4.1.1 Alloy Designation—Whenorderingarticlespassivated
B 322 Practice for Cleaning Metals Prior to Electroplating
4
in accordance with this specification, the purchaser shall state,
B 374 Terminology Relating to Electroplating
in addition to theASTM designation number, the date of issue,
B 602 Test Method for Attribute Sampling of Metallic and
4
the alloy designation number, and the testing method(s) by
Inorganic Coatings
5
which the article will be evaluated (see 5.3).
D 3951 Practice for Commercial Packaging
4.1.2 Appearance—The purchaser shall specify the appear-
2.2 ISO Standards:
ance required, for example, bright or dull. Unless otherwise
ISO 2080 Electroplating and Related Processes—
6
specified by the purchaser, a bright luster shall be acceptable.
Vocabulary
Alternatively, samples showing the required finish, or range of
finish, shall be supplied or approved by the purchaser. When
1
This specification is under the jurisdiction of ASTM Committee B08 on
required, the basis material may be subjected, before elec-
Metallic and Inorganic Coatings and is the direct responsibility of Subcommittee
tropolishing, to such mechanical polishing as may be required
B.08.07on Chromate Conversion Coatings.
to yield the desired final surface characteristics.
Current edition approved Sept. 10, 2002. Published November 2002.
2
Annual Book of ASTM Standards, Vol 01.03.
3
Annual Book of ASTM Standards, Vol 03.02.
4
Annual Book of ASTM Standards, Vol 02.05.
5
Annual Book of ASTM Standards, Vol 15.09.
6 7
Available from American National Standards Institute, 11 W. 42nd St., 13th This standard is not a requirement but can be referenced for additional
Floor, New York, NY 10036. information.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B912–02
4.1.3 Contact Marks—Visible contact marks
...

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