ASTM B994/B994M-22
Standard Specification for Nickel-Cobalt Alloy Coating

Standard No.
ASTM B994/B994M-22
Release Date
2022
Published By
American Society for Testing and Materials (ASTM)
Latest
ASTM B994/B994M-22
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, coastal marine, and ACQ (Alkaline Copper Quaternary) treatments for wood treatments. 1.6 Units—The values stated in either SI units or inchpound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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, health, and environmental 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. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM B994/B994M-22 Referenced Document

  • ASTM A193/A193M Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service
  • ASTM A194/A194M Standard Specification for Carbon and Alloy Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both
  • ASTM A681 Standard Specification for Tool Steels Alloy
  • ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus
  • ASTM B183 Standard Practice for Preparation of Low-Carbon Steel for Electroplating
  • ASTM B242 Standard Guide for Preparation of High-Carbon Steel for Electroplating
  • ASTM B254 Standard Practice for Preparation of and Electroplating on Stainless Steel
  • ASTM B320 Standard Practice for Preparation of Iron Castings for Electroplating
  • ASTM B322 Standard Guide for Cleaning Metals Prior to Electroplating
  • ASTM B374 Standard Terminology Relating to Electroplating
  • ASTM B568 Standard Test Method for Measurement of Coating Thickness by X-Ray Spectrometry
  • ASTM B571 Standard Practice for Qualitative Adhesion Testing of Metallic Coatings
  • ASTM B602 Standard Test Method for Attribute Sampling of Metallic and Inorganic Coatings
  • ASTM B697 Standard Guide for Selection of Sampling Plans for Inspection of Electrodeposited Metallic and Inorganic Coatings
  • ASTM B762 Standard Test Method of Variables Sampling of Metallic and Inorganic Coatings
  • ASTM B849 Standard Specification for Pre-Treatments of Iron or Steel for Reducing Risk of Hydrogen Embrittlement
  • ASTM B850 Standard Guide for Post-Coating Treatments of Steel for Reducing the Risk of Hydrogen Embrittlement
  • ASTM D1193 Standard Specification for Reagent Water
  • ASTM E2465 Standard Test Method for Analysis of Ni-Base Alloys by Wavelength Dispersive X-Ray Fluorescence Spectrometry*， 2023-11-01 Update
  • ASTM F1470 Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection*， 2024-01-26 Update
  • ASTM F519 Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating Processes and Service Environments
  • ASTM G102 Standard Practice for Calculation of Corrosion Rates and Related Information from Electrochemical Measurements
  • ASTM G193 Standard Terminology and Acronyms Relating to Corrosion*， 2022-08-01 Update
  • ASTM G59 Standard Test Method for Conducting Potentiodynamic Polarization Resistance Measurements
  • ASTM G85 Standard Practice for Modified Salt Spray (Fog) Testing

ASTM B994/B994M-22 history

Standard Specification for Nickel-Cobalt Alloy Coating


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