日本金属学会誌

J. Japan Inst. Metals, Vol. 73, No. 9 (2009),
pp. 659-665

Effect of Contact Force on the Friction Coefficient of Electroplated Tin Films for Automotive Applications

Shigeru Sawada1, Terutaka Tamai1 and Yasuhiro Hattori2

1Vehicle Network Technology Laboratory, Graduate School of Engineering, Mie University, Tsu 514-8507
2Auto Networks Technologies, Ltd., Suzuka 513-8631

Abstract:

Tin plating is commonly applied for automotive connectors. To clarify the mechanism of fretting corrosion of tin plating, friction coefficient behavior of tin plating is needed to investigate in detail. In this study, the factors of the friction coefficient for tin plating contact were examined in the case of embossment-plane contact. As experimental results it was found that the friction coefficient is affected by contact force, plating thickness and contact radius. The force dependence of the real contact area estimated by FEM analysis shows that the real contact area occurred by elasto-plastic deformation. A larger contact radius and thicker plating thickness result in a larger friction coefficient, because the real contact area is larger. A heavier force results in a smaller friction coefficient, because the average of the contact pressure is larger. The shear stress, which is estimated from experimental results, is much higher than that of tin metal. This indicates that tin attrition of embossment-plane contact is not the shear of tin metal on tin metal but the shear of tin metal on tin oxide according to the hardness results of the tin oxide layer.


(Received 2009/4/13)

Keywords:

electric contact, friction coefficient, tin plating, contact area, contact force, shear stress


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