NDLI: Corrosion of precious metal plated copper alloys due to mixed flowing gas exposure

Content Provider	IEEE Xplore Digital Library
Author	Geckle, R.J. Mroczkowski, R.S.
Copyright Year	1978
Abstract	Corrosion of precious-metal-plated copper alloys after exposure to a mixed flowing gas environment was studied. Six copper alloys used in electronic connectors were selected for study. All alloys were plated with a nickel underplate, followed by a precious metal surface plating of gold or gold-flashed palladium. The coupons were then exposed to a mixed flowing gas environment containing chlorine, hydrogen sulfide, and nitrogen oxide. The base metal corrosion products arising from these exposures migrate to the surface through originating plating defects, creating films and corrosion mounds on the surface and large etch pits in the copper alloy substrate. The surface corrosion products were analyzed by an electron microprobe and found to be very complex. All constituents of the copper alloys, as well as nickel from the underplate, were found in the corrosion products. The metals were found to be in combination with oxygen, chlorine, and sulphur in varying amounts and distributions. The attack of the environment on the base metal was also complex. Grain boundary corrosion and alloy separation were noted. Examples of the corrosion products and processes are discussed.<>
Sponsorship	IEEE Electronic Industries Alliance American Society of Mechanical Engineering (ASME) NBS SAE
Starting Page	162
Ending Page	169
Page Count	8
File Size	1127896
File Format	PDF
ISSN	01486411
Volume Number	14
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1991-03-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Corrosion Copper alloys Connectors Gold alloys Nickel alloys Palladium Hydrogen Nitrogen Etching Electrons
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Electronic, Optical and Magnetic Materials Engineering Electrical and Electronic Engineering

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