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.”
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
Ackroyd, M. L. 1976. Proc. INTERNEPCON 1976. Oct. 1976. p. 214.
Ackroyd, M. L., C. A. MacKay, and C. J. Thwaites. 1975. Met. Technol. 2(pt.2):73.
Ammar, I. A., S. Darwish, M. W. Khalil, and A. Galal. 1983. Z. Werkstofftech. 14:330.
Ammar, I. A., S. Darwish, M. W. Khalil, and A. Galal. 1985. Z. Werkstofftech. 16:194.
Ammar, I. A., S. Darwish, M. W. Khalil, and A. Galal. 1988. Mat.-wiss. u. Werkstofftech. 19:294.
Ammar, I. A., S. Darwish, M. W. Khalil, and S. El-Taher. 1988. Mat.-wiss. u. Werkstofftech. 19:271.
Ammar, I. A., S. Darwish, M. W. Khalil, and S. El-Taher. 1990. Corros. J. 46:197.
Ansell, R. O., T. Dickinson, A. F. Povey, and P. M. A. Sherwood. 1977. J. Electrochem. Soc. 124:1360.
Bader, W. G., and R. G. Baker. 1973. Plating. March 1973. p. 242.
Bernier, D. 1974. Plating. 61(9):842.
Bevolo, A. J., J. D. Verhoeven, and M. Noack. 1983. Surf. Sci. 134:499.
Billot, M., and S. Clement. 1981. Tin and Its Uses. 131:1.
Bird, R. J. 1973. Met. Sci. J. 7:109.
Boggs, W. E., P. S. Trozzo, and G. E. Pellisier. 1961. J. Electrochem. Soc. 108:13.
Boggs, W. E., R. H. Kachik, and G. E. Pellisier. 1963. J. Electrochem. Soc. 110:4.
Bowlby, R. 1987. Circuits Manufacturing. Nov. 1987. p. 76.
Boyer, A. P. 1979. Electron Packaging Prod. Oct 1979. p. 48.
Britton, S. C., and K. Bright. 1957. Metallurgia. 56:163.
Britton, S. C, and J. C. Sherlock. 1974. Br. Corros. J. 9:96.
Burleigh, T. D., and H. Genscher. 1988. J. Electrochem. Soc. 135:2938.
Costello, B. J. 1978. Electron. Packaging. Prod. July 1978. p. 64.
Davies, D. E., and S. N. Shah. 1963. Electrochim. Acta 8:703.
Davis, P. E. 1971. Plating. 58(7):694.
Davis, P. E., M. E. Warwick, and P. J. Kay. 1982. Plating Surf. Fin. 69(9):72.
Davis, P. E., M. E. Warwick, and S. J. Muckett. 1983. Plating Surf. Fin. 70(8):49.
Davis, P. E., M. E. Warwick, and S. J. Muckett. 1964. GE Tech Information Series. General Electric Company. Report No. R64ELS-44. May 1964.
Di Giacomo, G. 1986. Proc. Int. Symp. Microelectronics. Atlanta, GA. p. 322.
Do Duc, H., and P. Tissot. 1979. Corros. Sci. 19:179.
Drowgowska, M., H. Ménard, and L. Brossard. 1991. J. Appl. Electrochem. 21:84.
Dunn, B. D. 1980. Trans. Inst. Met. Finish. 58:26.
Edington, R. J., and L. A. Lawrence. 1988. Printed Circuit Assembly. 2(6): 13.
Eishon, G., and S. M. Bobbio. 1990. “Fluxless Soldering Process.” U. S. Patent No. 4,921,157. Issued 1 May 1990.
El Wakkad, S. E. S., A. M. Shams El Din, and J. A. El Sayed. 1954. J. Chem. Soc. (London). p. 3103.
Farrell, T. 1976. Met. Sci. March 1976. p. 87.
Fidos, H., and K. Piekarski. 1973. Inst. Metals. 101:95.
Frankenthal, R. P., and D. J. Siconolfi. 1980. J. Vac. Sci. Technol. 17:1315.
Frankenthal, R. P., and D. J. Siconolfi. 1981. Surf. Sci. 104:205.
Frear, D., D. Grivas, and J. W. Morris Jr. 1988. J. Electron. Mater. 17(2):171.
Gabe, D. R. 1977. Surf. Technol. 5:463.
Geiger, A. L. 1986. Proc. 10th Annual Soldering/Manufacturing Seminar. Naval Weapons Center, China Lake. NWC TP 6707. p. 111.
Geist, H. E. 1983. Electrochem. Soc. Extended Absts. 83(2):314.
Geist, H., and M. Kottke. 1986. Proc. 36th IEEE Electronic Conf. p. 636.
Giannetti, B. F., P. T. A. Sumodjo, and T. Rabockai. 1990. J. Appl. Electrochem. 20:672.
Hagge, J. K., and G. J. Davis. 1985. Circuit World. 11(3):8.
Hampson, N. A., and N. E. Spencer. 1968. Br. Corros. J. 3:1.
House, C. I., and G. H. Kelsall. 1984. Electrochem. Acta. 29:1439.
IPC/EIA Steam Aging Task Group Report. April 1992.
Kapusta, S. D., and N. Hackerman. 1980. Electrochim. Acta. 25:1625.
Kay, P. J. 1981. The Joining of Metals: Practice and Performance. vol. 2. London, U.K.: Inst. of Metallurgists. p. 131.
Kay, P. J., and C. A. MacKay. 1976. Trans. Inst. Met. Finish. 54:68.
Kay, P. J., and C. A. MacKay. 1979. Trans. Inst. Met. Finish. 57:169.
Klein-Wassink, R. J. 1989. Soldering in Electronics. Ayr, Scotland: Electrochemical Publications, Ltd.
Konetzki, R.A., Y. A. Chang, and V. C. Marcotte. 1989. J. Mater. Res. 4:1421.
Konetzki, R. P., and Y. A. Chang. 1988. J. Mater. Res. 3:466.
Konetzki, R. P., M. X. Zhang, D. A. Sluzewski, and Y. A. Chang. 1990. J. Electron. Packaging. 112:175
Kumar, K., and A. Moscaritolo. 1981. J. Electrochem. Soc. 128(2):379.
Kurz, R., and E. Kleiner. 1971. Z. f. Werkstofftechnik/J. Mater. Technol. 2:418.
Lampe, B. T. 1976. Welding Res. Suppl. 330-s.
Le Fevre, B. G., and R. A. Barczykowski. 1985. Wire J. Int. 18(1):66.
Lea, C. 1986. DVS. 104:180.
Lea, C. 1991. Soldering Surf. Mount Technol. 7:10
Lea, C. 1991. Soldering Surf. Mount Technol. 8:4.
Lin, A. W. C., N. R. Armstrong, T. Kuwana. 1977. Anal. Chem. 49:1228.
Luner, C. 1960. Trans. Metallur. Soc. AIME. 218:572.
MacKay, C. A. 1979. Welding Met. Fab. Jan/Feb. 1979. p. 53.
Electronics. April 1983. p. 41.
Mather, J. C. 1984. PC Fab. April 1984. p. 34.
McCarthy, T. J., C. A. MacKay, and C. J. Thwaites. 1980. Circuit World. 6(4):6.
Mei, S., H. B. Huntington, C. K. Hu, and M. J. McBride. 1987. Scripta Metal. 21:153.
Miller, R. G., and C. Q. Bowles. 1990. Oxid. Metals. 33:95.
Nagasaka, M., H. Fuse, and T. Yamashina. 1975. Thin Solid Films. 29:L29.
Nagel, V. 1985. ZIS-Mitteilungen. 27:440.
Orchard, S. W., R. L. Paul, and J. E. C. Timm. 1982. S. Afr. J. Chem. 35(4):161.
Penzek, E. S. 1977. NEPCON Proc. March & May 1977.
Pourbaix, M. 1974. Atlas of Electrochemical Equilibria in Agueous Solutions. 2nd ed. NACE (Cebelcor). Houston, TX. (Brussels).
Powell, R. A. 1979. Appl. Surf. Sci. 2:397.
Pugh, M., L. M. Warner, and D. R. Gabe. 1967. Corros. Sci. 7:807.
Reed, J. R., N. E. Thompson, and R. K. Pond. 1991. IPC Tech. Review. June 1991. p. 16.
Russel, W. R., B. M. Waller, P. S. Barry, and W. M. Wolverton. 1989. Soldering Surf. Mount. Technol. Oct. 1989. p. 25.
Shah, S. N., and D. E. Davies. 1963. Electromchim. Acta. 8:663.
Shams El Din, A. M., and F. M. Abd El Wahab. 1964. Electrochim. Acta. 9:883.
Simic, V., and Z. Marinkovic. 1980. J. Less Common Met. 72:133.
Spiliotis, N. J. 1978. Insulation/Circuits. June 1978. p. 33.
Starke, E., and H. Wever. 1964. Z. Metallkde. 55(3): 107.
Steen, H. A. H., and G. Becker. 1986. Brazing and Soldering. 11:4.
Steen, H. A. H., and A. Bengston. 1987. Brazing and Soldering. 13:28.
Stirrup, B. N., and N. A. Hampson. 1976. J. Electroanal. Chem. 67:45
Stirrup, B. N., and N. A. Hampson. 1976. J. Electroanal. Chem. 73:189.
Stoneman, A. M., and C. A. MacKay. 1977. Proc. INTERNEPCON. Oct. 1977. p. 49.
Tench, D. M., and D. P. Anderson. 1990. Plating Surf. Finish. 77(8):44; U. S. Patent pending (filed 28 May 1991).
Tench, D. M., and D. P. Anderson. 1992. “Method of Restoring Solderability.” U. S. Patent No. 5,104,494. Issued 14 April 1992.
Tench, D. M., and D. P. Anderson. 1993. “Roughened Substrate for Uniform Solder Coating.” U. S. Patent No. 5,178,965. Issued 12 Jan. 1993.
Tench, D. M., M. W. Kendig, D. P. Anderson, D. D. Hillman, G. K. Lucey, and T.J. Gher. (a) (in press). “Production Validation of SERA Solderability Testing.” Soldering Surf. Mount Technol.
Tench, D. M., D. P. Anderson, and P. Kim. (b). “Solderability Assessment via Sequential Electrochemical Reduction Analysis,” submitted to J. Appl. Electrochem.
Samsonov, G. V., ed. 1973. The Oxide Handbook. New York: IFI/Plenum. p. 263.
Thwaites, C. J. 1959. Trans. Inst. Met. Finish. 36:203.
Thwaites, C. J. 1965. Trans. Inst. Met. Finish. 43:143.
Thwaites, C. J. 1972. Welding J. Oct. 1972. p. 702.
Unsworth, D. A., and C. A. MacKay. 1973. Trans. Inst. Met. Finish. 51:85.
Varsányi, M. L., J. Jaén, A. Vértes, and L. Kiss. 1985 Electrochim. Acta. 30:529.
Vértes, A., H. Leidheier Jr., M. L. Varsányi, G. W. Simmons, and L. Kiss. 1978. J. Electrochem. Soc. 125:1946.
Wild, R. N. 1985. Brazing and Soldering. 9:5.
Wild, R. N. 1987. Brazing and Soldering. 13:42.
Wilson, G. C. 1977. New Electronics. 10(6):99.
Wilson, G. C. 1978. Circuit World. 4(3):39.
YiYu, Q., F. Hongyuan, C. Dinghua, F. Fuhua, and H. Lixia. 1987. Brazing and Soldering. 13:39.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1993 Van Nostrand Reinhold
About this chapter
Cite this chapter
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
Download citation
DOI: https://doi.org/10.1007/978-1-4684-1440-0_6
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-1442-4
Online ISBN: 978-1-4684-1440-0
eBook Packages: Springer Book Archive