ASTM B912-02

    Standard Specification for Passivation of Stainless Steels Using Electropolishing


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    1. 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems

    A967 Specification for Chemical Passivation Treatments for Stainless Steel Parts

    B117 Practice for Operating Salt Spray (Fog) Apparatus

    B322 Guide for Cleaning Metals Prior to Electroplating

    B374 Terminology Relating to Electroplating

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    D3951 Practice for Commercial Packaging

    ISO Standards

    ISO15730 Metallic and Other Inorganic Coatings--Electropolishing as a Means of Smoothing and Passivating Stainless Steels

    ISO2080 Electroplating and Related Processes--Vocabulary

    ISO4519 Electrodeposited Metallic Coatings and Related Finishes--Sampling Procedures for Inspection by Attributes

    ISO9227 Corrosion Tests in Artificial Atmospheres--Salt Spray Tests


    ICS Code

    ICS Number Code 49.040 (Coatings and related processes used in aerospace industry)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0912-02

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