Abstract

This specification covers the requirements for multilayer coatings of autocatalytic nickel-phosphorus over autocatalytic copper intended for electromagnetic interference or electrostatic discharge shielding to parts fabricated from either polymeric or metallic substrates or parts. Coatings are classified into four types based on thickness and testing requirements, and into two grades based on alloy composition, specifically phosphorus. Surfaces shall be prepared by cleaning it of surface contaminants, conditioning, and activation; identifying of base material suitability; and mechanical roughening. Coatings shouldl be inspected for process qualification, appearance, blisters, unplated areas, adhesion, electrical continuity, and DC resistance. Coatings should also be tested for thickness, which may be performed either by Coulometric, X-ray, or Beta backscatter methods. The requirements for process qualification shall include coating composition, electrical integrity, adhesion, thermal shock resistance, thermal cycling, and shielding effectiveness.

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

This specification presents the requirements for multilayer coatings of autocatalytic nickel-phosphorus over autocatalytic copper on metallic and polymeric substrates. The coating system is intended to provide electromagnetic interference (EMI) protection properties or electrostatic discharge (ESD) protection to parts fabricated from either polymeric or metallic materials.

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

A919 Terminology Relating to Heat Treatment of Metals

B183 Practice for Preparation of Low-Carbon Steel for Electroplating

B242 Guide for Preparation of High-Carbon Steel for Electroplating

B252 Guide for Preparation of Zinc Alloy Die Castings for Electroplating and Conversion Coatings

B253 Guide for Preparation of Aluminum Alloys for Electroplating

B320 Practice for Preparation of Iron Castings for Electroplating

B322 Guide for Cleaning Metals Prior to Electroplating

B374 Terminology Relating to Electroplating

B504 Test Method for Measurement of Thickness of Metallic Coatings by the Coulometric Method

B532 Specification for Appearance of Electroplated Plastic Surfaces

B533 Test Method for Peel Strength of Metal Electroplated Plastics

B553 Test Method for Thermal Cycling of Electroplated Plastics

B554 Practice for Measurement of Thickness of Metallic Coatings on Nonmetallic Substrates

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

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

B727 Practice for Preparation of Plastics Materials for Electroplating

B733 Specification for Autocatalytic (Electroless) Nickel-Phosphorus Coatings on Metal

D3330/D3330M Test Method for Peel Adhesion of Pressure-Sensitive Tape

D3359 Test Methods for Measuring Adhesion by Tape Test

D4935 Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials

Military Standard

Keywords

Metallic coatings--specifications; Nickel--specifications; Nickel coatings--specifications; Polymeric substrates; Substrates; Autocatalytic coatings--specifications; EMI (electromagnetic interference); ESD (electrostatic static discharge) materials/applications;

ICS Code

ICS Number Code 25.220.40 (Metallic coatings)

DOI: 10.1520/B0904-00R09

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ASTM B904