EVALUATION OF THE PERFORMANCE OF ELECTROLESSNi–BCOATED BRASS CONTACTS UNDER FRETTING CONDITIONS

T. S. N. Sankara Narayanan, Young Woo Park and Kang Yong Lee ()
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T. S. N. Sankara Narayanan: Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemum-gu, Seoul 120-749, Korea
Young Woo Park: Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemum-gu, Seoul 120-749, Korea
Kang Yong Lee: Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, 134, Sinchon-dong, Seodaemum-gu, Seoul 120-749, Korea

Surface Review and Letters (SRL), 2008, vol. 15, issue 04, 443-452

Abstract: The performance of electroless (EL)Ni–Bcoated brass contacts under fretting conditions was evaluated. The contact resistance of ELNi–Bcoated brass contact was measured as a function of fretting cycles. The surface profile and wear depth of the fretted zone were measured using laser scanning microscope. The study reveals that ELNi–Bcoated contacts exhibit better performance under fretting conditions. However, at conditions which are prone for severe oxidation such as, low frequency (3 Hz) or high temperature (155°C), ELNi–Bcoated contacts fail to exhibit a better stability. The quick removal of the oxide film by fretting motion, rapid oxidation of the fresh metallic particles and trapping of the oxidation products in the remaining coating, cause the contact resistance to increase to unacceptable levels at such conditions. The study concludes that ELNi–Bcoating is not a suitable choice for connector contacts that could experience fretting under highly oxidizing conditions.

Keywords: Fretting; electroless; Ni–Bcoating; contact resistance (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011573

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