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Abstract

Solder coatings are widely used to protect copper printed wiring board (PWB) circuitry and electronic component leads from oxidation that can lead to loss of solderability. The coating is usually eutectic Sn-Pb that is either applied directly by hot dipping or electroplated and then densified by reflowing (melting). Numerous studies and ample practical experience have shown that, when properly applied and sufficiently thick, such coatings remain solderable even after several years of normal storage. In practice, however, the coating composition/morphology and storage conditions may not be optimum, allowing solderability degradation to occur. In addition, molten solder tends to flow away from curved areas in the substrate, resulting in localized thinning during solder dipping or reflow. Exposure of the underlying Cu-Sn intermetallic layer in the thinned region can lead to loss of solderability. Thinned solder is a particular problem at PWB through-hole rims and is commonly referred to as “weak knees.”

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© 1993 Van Nostrand Reinhold

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Tench, D.M. (1993). Oxidation of Solder Coatings. In: Yost, F.G., Hosking, F.M., Frear, D.R. (eds) The Mechanics of Solder Alloy Wetting and Spreading. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1440-0_6

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