Effect of Hardness on Wear and Abrasion Resistance of Silver Plating on Copper Alloy

Shigeru SAWADA  Song-Zhu KURE-CHU  Rie NAKAGAWA  Toru OGASAWARA  Hitoshi YASHIRO  Yasushi SAITOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.9   pp.695-701
Publication Date: 2017/09/01
Online ISSN: 1745-1353
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electro-Mechanical Devices)
Category: 
Keyword: 
connector,  silver plating,  friction coefficient,  contact resistance,  sliding friction,  

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Summary: 
This study is aimed at clarifying the mechanism of wear process for Ag plating. The samples of different hardness Ag plating on copper alloys were prepared as coupon and embossment specimens, which simulated terminal contacts. During the sliding test, the contact resistance and the friction coefficient versus sliding distance are measured. The surface observation and surface roughness of the Ag films after wear tests were investigated. As results, the hard Ag plating film (120 Hv) exhibited higher contact resistance comparing to the soft Ag plating film (80 Hv). The soft Ag film delivered wider wear trace on coupon specimens compared to the hard one. Moreover, the observation of tribofilms formed on the Ag films after wear tests suggested that a mixed-type of adhesive and abrasive wears occurred for both of soft and hard Ag films. Furthermore, the fretting corrosion resistance of Ag plating samples with different hardness was also investigated. As results, the wear resistance of hard Ag film was stronger than that of soft Ag film.