Factors Influencing the Fretting Corrosion of Tin Plated Contacts

Tetsuya ITO  Masato MATSUSHIMA  Kensaku TAKATA  Yasuhiro HATTORI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.7   pp.1412-1416
Publication Date: 2007/07/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.7.1412
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from ICEC2006))
Category: Contact Phenomena
Keyword: 
fretting,  control factors,  plating thickness,  

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Summary: 
In recent years, there have been ever-increasing demands to miniaturize automotive connectors. However, because the contact force decreases as connectors are miniaturized further, fretting corrosion, which is a typical problem occurring with low-force electric contacts, is expected to become a more serious problem in future. This time we developed a new experimental device capable of controlling the contact load, fretting amplitude, fretting frequency, contact part temperature and humidity optionally. In this report, we used the design of experiments method, and quantitatively evaluated the extent of the influence of the expected factor (in terms of load, amplitude, and plating thickness, etc.) on the fretting phenomenon, which occurs in the tin plating of the connector terminal. Moreover, based on SEM examination, we analyzed the surface and cross section of the contact parts when degradation occurs, and considered the mechanism of the degradation.