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ASTM B733-15
Standard Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal
STANDARD published on 1.11.2015
The information about the standard:
Designation standards: ASTM B733-15
Note: WITHDRAWN
Publication date standards: 1.11.2015
SKU: NS-621957
The number of pages: 14
Approximate weight : 42 g (0.09 lbs)
Country: American technical standard
Category: Technical standards ASTM
The category - similar standards:
Annotation of standard text ASTM B733-15 :
Keywords:
autocatalytic, chemical nickel, coatings, conductive, corrosion resistance, electroless, functional, nickel, nickel phosphorus, wear resistance,, ICS Number Code 25.220.40 (Metallic coatings)
Additional information
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1.1 This specification covers requirements for autocatalytic (electroless) nickel-phosphorus coatings applied from aqueous solutions to metallic products for engineering (functional) uses. 1.2 The coatings are alloys of nickel and phosphorus produced by autocatalytic chemical reduction with hypophosphite. Because the deposited nickel alloy is a catalyst for the reaction, the process is self-sustaining. The chemical and physical properties of the deposit vary primarily with its phosphorus content and subsequent heat treatment. The chemical makeup of the plating solution and the use of the solution can affect the porosity and corrosion resistance of the deposit. For more details, see ASTM STP 265 1.3 The coatings are generally deposited from acidic solutions operating at elevated temperatures. 1.4 The process produces coatings of uniform thickness on irregularly shaped parts, provided the plating solution circulates freely over their surfaces. 1.5 The coatings have multifunctional properties, such as hardness, heat hardenability, abrasion, wear and corrosion resistance, magnetics, electrical conductivity provide diffusion barrier, and solderability. They are also used for the salvage of worn or mismachined parts. 1.6 The low phosphorus (2 to 4 % P) coatings are microcrystalline and possess high as-plated hardness (620 to 750 HK 100). These coatings are used in applications requiring abrasion and wear resistance. 1.7 Lower phosphorus deposits in the range between 1 and 3 % phosphorus are also microcrystalline. These coatings are used in electronic applications providing solderability, bondability, increased electrical conductivity, and resistance to strong alkali solutions. 1.8 The medium phosphorous coatings (5 to 9 % P) are most widely used to meet the general purpose requirements of wear and corrosion resistance. 1.9 The high phosphorous (more than 10 % P) coatings have superior salt-spray and acid resistance in a wide range of applications. They are used on beryllium and titanium parts for low stress properties. Coatings with phosphorus contents greater than 11.2 % P are not considered to be ferromagnetic. 1.10 The values stated in SI units are to be regarded as standard. 1.11 The following precautionary statement pertains
only to the test method portion, Section 9, of this specification.
Standard Terminology Relating to
Electroplating Standard Test Method for Corrosion
Testing of Decorative Electrodeposited Coatings by the Corrodkote
Procedure Standard Test Method for Measurement of
Metal and Oxide Coating Thickness by Microscopical Examination of
Cross Section Standard Test Method for
Copper-Accelerated Acetic Acid-Salt Spray (Fog) Testing (CASS
Test) Standard Test Method for Measurement of
Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on
Magnetic Basis Metals (Includes all amendments and changes
5/18/2021). Standard Specification for Pre-Treatments
of Iron or Steel for Reducing Risk of Hydrogen Embrittlement Standard Test Method for Measurement of
Thickness of Metallic Coatings by the Coulometric Method Standard Guide of Variables Sampling of
Metallic and Inorganic Coatings Standard Practice for Rating of
Electroplated Panels Subjected to Atmospheric Exposure Standard Test Method for Measurement of
Coating Thickness by the Beta Backscatter Method Standard Test Method for Solderability of
Metallic-Coated Products Standard Guide for Selection of Sampling
Plans for Inspection of Electrodeposited Metallic and Inorganic
Coatings Standard Guide for Post-Coating
Treatments of Steel for Reducing the Risk of Hydrogen
Embrittlement Standard Specification for Automated
Controlled Shot Peening of Metallic Articles Prior to Nickel,
Autocatalytic Nickel, or Chromium Plating, or as Final Finish Standard Specification for Reagent
Water Standard Test Method for Measuring Wear
Properties of Fluid Lubricants (Falex Pin and Vee Block Method) Standard Test Method for Calibration and
Operation of the Falex Block-on-Ring Friction and Wear Testing
Machine Standard Practice for Commercial
Packaging Standard Test Method for Abrasion
Resistance of Organic Coatings by the Taber Abraser Standard Practice for Analysis of Metals,
Ores, and Related Materials by Spectrophotometry (Includes all
amendments and changes 6/29/2022). Standard Hardness Conversion Tables for
Metals Relationship Among Brinell Hardness, Vickers Hardness,
Rockwell Hardness, Superficial Hardness, Knoop Hardness,
Scleroscope Hardness, and Leeb Hardness (Includes all amendments
and changes 5/7/2019). Method for Determination of Phosphorus in
High-Phosphorus Brazing Alloys (Photometric Method) (Withdrawn
1993) Standard Test Methods for Chemical
Analysis of Tool Steels and Other Similar Medium- and High-Alloy
Steels Standard Test Method for Mechanical
Hydrogen Embrittlement Evaluation of Plating/Coating Processes and
Service Environments Standard Reference Test Method for Making
Potentiodynamic Anodic Polarization Measurements Standard Guide for Laboratory Immersion
Corrosion Testing of Metals Standard Test Method for Conducting
Potentiodynamic Polarization Resistance Measurements Standard Practice for Modified Salt Spray
(Fog) Testing MIL-R-81841 Rotary Flap Peening of Metal Parts
Available from Standardization Documents Order Desk, Bldg. 4
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn:
NPODS. MIL-STD-105 Sampling Procedures and Tables for
Inspection by Attribute ISO 4527 Autocatalytic Nickel-Phosphorus
Coatings--Specification and Test Methods Available from American
National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New
York, NY 10036, http://www.ansi.org. Standard Test Method for Measurement of
Coating Thickness by X-Ray Spectrometry Standard Practice for Qualitative
Adhesion Testing of Metallic Coatings Standard Test Method for Microindentation
Hardness of Electroplated Coatings Standard Guide for Attribute Sampling of
Metallic and Inorganic Coatings Standard Practice for Construction and
Use of a Probe for Measuring Electrical Contact Resistance |
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