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    ASTM B607 - 15

    Standard Specification for Autocatalytic Nickel Boron Coatings for Engineering Use

    Active Standard ASTM B607 | Developed by Subcommittee: B08.03

    Book of Standards Volume: 02.05

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    This standard contains the requirements for autocatalytic nickel boron alloy coatings deposited from aqueous solutions without the use of external electric sources. The specification classifies the hard, uniform, microporous, and limited corrosion protection coatings as either Type 1 or Type 2 depending on the boron content. Both the physical and mechanical properties of the coatings such as density, hardness, stress, and melting point also vary with the boron content. In general, these coatings are not heat treated to maintain solderability.

    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 Nickel boron coatings are produced by autocatalytic (electroless) deposition from aqueous solutions. These solutions contain either an alkylamineborane or sodium borohydride as a reducing agent, a source of nickel ions, a buffer, complexant, and control chemicals.

    1.2 This specification describes the requirements for coatings of autocatalytic nickel boron deposited from aqueous solutions onto substrates for engineering use. The specification classifies these coatings into two types:

    1.2.1 Type 1 coatings  have a boron content of 0.1 to less than 3.5 mass percent with the balance nickel.

    1.2.2 Type 2 coatings  have a boron content of 3.5 to 6 mass percent and a minimum of 90 mass percent nickel.

    1.3 The coatings are hard and uniform in thickness, even on irregular shaped parts, and used in a wide range of applications.

    1.4 Process solutions formulated with an alkylamineborane usually produce coatings that contain 0.1 to 3.5 % boron. Thin coatings of this type provide bondability and solderability on electronic components such as lead frames, electrical contacts, and headers. To maintain solderability, these coatings are generally not heat treated.

    1.5 Process solutions formulated with sodium borohydride are strongly alkaline and are frequently used to plate steel and titanium parts to impart surface hardness and wear resistance properties. Deposits produced from these processes can contain 3 to 5 % boron and thallium or other metals which are used to stabilize the plating solution and modify the coating properties.

    1.6 The physical and mechanical properties of these deposits such as density, hardness, stress, and melting point will vary with the boron content. The variation of boron content also affects the quantity and structure of nickel boride precipitated during heat treatment. In the as-plated condition the deposit consists of a predominantly amorphous mixture of nickel and boron with a hardness of about 700 HKN. When the deposit is heated above 300°C the nickel crystallizes, forming nickel clusters of Ni (111) and boron precipitates as nickel boride, Ni3B (211) and (311), increasing the hardness to greater than 1000 HK100 for Type 2 coatings.

    1.7 The nickel boron coatings are microporous and offer limited corrosion protection. Their columnar structure, however, is beneficial in reducing wear because it provides a means of trapping lubricants within the surface of the coated part.

    1.8 This document describes only autocatalytic nickel boron coatings that have been produced without use of external electric sources.

    1.9 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.10 The following hazards caveat pertains only to the Test Methods section of this specification: This standard does not purport to address the safety problems 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.

    Note 1: The following AMS standards are not requirements. They are referenced for information only: AMS 2399 and AMS 2433.

    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

    B374 Terminology Relating to Electroplating

    B487 Test Method for Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of Cross Section

    B567 Test Method for Measurement of Coating Thickness by the Beta Backscatter Method

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

    B571 Practice for Qualitative Adhesion Testing of Metallic Coatings

    B578 Test Method for Microhardness of Electroplated Coatings

    B602 Test Method for Attribute Sampling of Metallic and Inorganic Coatings

    B656 Guide for Autocatalytic (Electroless) Nickel-Phosphorus Deposition on Metals for Engineering Use (Discontinued 2000)

    B667 Practice for Construction and Use of a Probe for Measuring Electrical Contact Resistance

    B678 Test Method for Solderability of Metallic-Coated Products

    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

    D2670 Test Method for Measuring Wear Properties of Fluid Lubricants (Falex Pin and Vee Block Method)

    D2714 Test Method for Calibration and Operation of the Falex Block-on-Ring Friction and Wear Testing Machine

    D4060 Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser

    E39 Methods for Chemical Analysis of Nickel

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

    Aerospace Materials Specifications

    AMS 2399

    AMS 2433

    U.S. Government Standards

    MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.

    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code

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

    DOI: 10.1520/B0607-15

    Citation Format

    ASTM B607-15, Standard Specification for Autocatalytic Nickel Boron Coatings for Engineering Use, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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