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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.
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.
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
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 StandardMIL-STD-461 Electromagnetic Emission and Susceptibility Requirements for the Control of Electromagnetic Interference Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave. Philadelphia, PA 19111-5094, Attn: NPODS.
ICS Number Code 25.220.40 (Metallic coatings)
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ASTM B904-00(2014), Standard Specification for Autocatalytic Nickel over Autocatalytic Copper for Electromagnetic Interference Shielding, ASTM International, West Conshohocken, PA, 2014, www.astm.orgBack to Top