Abstract
A new method is described for removing oxides from metallic surfaces via electroless reduction by the reducing member of a redox couple that is electrochemically regenerated in a closed loop. On tin-lead coatings, which are widely used to enhance the solderability retention of electronic components and circuit boards, naturally-formed oxides are reduced to the metallic state within ten seconds by either vanadous or chromous ions in acidic sulfate solution. Wetting balance data for wire specimens show thet this reduction treatment is an effective means of restoring and ensuring solderability.
Similar content being viewed by others
References
D. M. Tench and D. P. Anderson, Plat. Surf. Finish. 77(8) (1990) 44.
D. M. Tench and D. P. Anderson, US Patent 5104494, (14 Apr. 1992).
D. M. Tench, D. P. Anderson and L. F. Warren, US Patent 5304297 (19 Apr. 1994).
C. Lea, ‘Quantitative solderability measurement of electronic components’, Part 1: ‘The wetting balance’, Soldering Surf. Mount. Technol., no. 4 (1990) p. 8, p. 14; no. 5 (1990) p. 46; no. 6 (1990) p. 4.
, ’, no. 4 (1990) p. 14.
, ’, no. 6 (1990) p. 4.
, omibid.‘Quantitative solderability measurement of electronic components’, Part 5: ‘Wetting balance instrumental parameters and procedures’, no. 7 (1991) p. 10.
D. M. Tench, D. P. Anderson and P. Kim, J. Appl. Electrochem. 24 (1994) 18.
D. M. Tench and D. P. Anderson, US Patent 5262022, (19 Nov. 1993).
D. M. Tench, M. W. Kendig, D. P. Anderson, D. D. Hillman, G. K. Lucey and T. J. Gher, Soldering Surf. Mount Technol., no. 13 (1993) 46.
D. M. Tench, J. T. White, D. Hillman, G. K. Lucey, T. J. Gher and B. Piekarski, ‘Fluxless wave soldering’, Circuit World 21(2) (1995) 44.
D. M. Tench, D. P. Anderson, P. Jambazian, P. Kim, D. Hillman, G. K. Lucey, T. Gher and B. Piekarski, ‘Reduced oxide soldering activation (ROSATM) method’, J. Metals 47(6) (1995) 36.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tench, D.M., Anderson, D.P., Jambazian, P. et al. Reduction of metallic surface oxides via an electrochemically-generated redox species. J Appl Electrochem 25, 947–952 (1995). https://doi.org/10.1007/BF00241589
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00241589