ASTM B994 / B994M - 15

    Standard Specification for Nickel-Cobalt Alloy Coating

    Active Standard ASTM B994 / B994M | Developed by Subcommittee: B08.03

    Book of Standards Volume: 02.05


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    Abstract

    This specification outlines the requirements for corrosion-resistant coatings of electrodeposited nickel-cobalt on metallic substrates and electrodeposited nickel-cobalt used for electroforming. It includes an accelerated exposure test method to evaluate the effects of corrosion and galling on the nickel-cobalt alloy coating, as well as a means of reporting the results to the purchaser.

    This specification incorporates a classification scheme that establishes service condition by thickness, classes of deposits based on the level of monitoring, and type based on supplemental coatings used after deposition. It also provides requirements for materials and manufacture; acceptance tests in terms of appearance, adhesion, and coating thickness, qualification tests (galling test, chemical composition, hydrogen embrittlement test, corrosion testing, environmental testing, third party reports, frequency of qualification tests); sampling; rejection; and certification.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification describes the requirements for corrosion-resistant coatings of electrodeposited nickel-cobalt on metallic substrates and electrodeposited nickel-cobalt used for electroforming.

    Note 1: The nickel-cobalt alloy is principally deposited as a coating on steel products. It can also be electrodeposited on iron, stainless steel, aluminum, titanium and any other metal substrate.

    Note 2: The nickel-cobalt alloy coating has a low coefficient of friction of 0.08 that provides a dry lubricant on part surfaces that are in contact with each other and are subject to galling.

    1.2 This specification incorporates an accelerated exposure test method to evaluate the effects of corrosion and galling on the coating, and incorporates a means of reporting the results to the purchaser.

    1.3 The specification incorporates a classification scheme that establishes service conditions for thickness, classes of deposits based on the level of monitoring, and type based on supplemental coatings used after deposition.

    1.4 The coating thickness ranges from 5 to >30 μm, and it can be applied to machined parts, springs, latches, threaded parts, fasteners, etc. The deposit can also be used to electroform parts requiring high strength with the alloy being maintained at 50% nickel-cobalt.

    1.5 The nickel-cobalt alloy is used to protect ferrous metals in contact with corrosive environments such as: oil and gas production facilities, costal marine, and ACQ (Alkaline Copper Quaternary) treatments for wood treatments.

    1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

    1.7 This standard 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.

    1.8 This standard has been revised to comply with the Restriction of Hazardous Substances RoHS Requirements that seek to limit the exposure of workers and the public to toxic metals. The nickel-cobalt alloy does not contain any of the six Restricted Hazardous Substances.


    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

    A193/A193M Specification for Alloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications

    A194/A194M Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both

    A681 Specification for Tool Steels Alloy

    B117 Practice for Operating Salt Spray (Fog) Apparatus

    B183 Practice for Preparation of Low-Carbon Steel for Electroplating

    B242 Guide for Preparation of High-Carbon Steel for Electroplating

    B254 Practice for Preparation of and Electroplating on Stainless Steel

    B320 Practice for Preparation of Iron Castings for Electroplating

    B322 Guide for Cleaning Metals Prior to Electroplating

    B368 Test Method for Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing (CASS Test)

    B374 Terminology Relating to Electroplating

    B568 Test Method for Measurement of Coating Thickness by X-Ray Spectrometry

    B571 Practice for Qualitative Adhesion Testing of Metallic Coatings

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    B697 Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings

    B762 Test Method of Variables Sampling of Metallic and Inorganic Coatings

    B849 Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement

    B850 Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement

    D1193 Specification for Reagent Water

    E2465 Test Method for Analysis of Ni-Base Alloys by Wavelength Dispersive X-Ray Fluorescence Spectrometry

    F519 Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments

    F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection

    G59 Test Method for Conducting Potentiodynamic Polarization Resistance Measurements

    G85 Practice for Modified Salt Spray (Fog) Testing

    G102 Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements

    ISO Standard

    ISO/IEC 17025:2005 General Requirements for the Competence of Testing and Calibration Laboratories


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 11101711(Non ferrous alloy)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0994_B0994M-15

    Citation Format

    ASTM B994 / B994M-15, Standard Specification for Nickel-Cobalt Alloy Coating, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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