Jeff: Try this:
ROSA. John�s spot on. I�ll add that it is a fluxless method that reduces the oxides in an aqueous solution. Another source of information is: Trench, M., Hillman, D., Lucey, G., "Environmentally Friendly Closed Loop Soldering," 1993 International CFC And Halon Alternatives Conference, Washington, DC. ROSE. Resistivity of Solvent Extract. A non-destructive technique contamination measurement technique that washes a IPA / DI water solution over a board and compares the resistivity of the solution to an equivalent NaCl solution to estimate ionic material. SERA. Sequential Electrochemical Reduction Analysis. A non-destructive technique that characterizes solderability, surface metal oxides, and intermetallics. SERA looks at surface oxidation in a much more user friendly manner that SEM or Auger.
Good luck
Dave F
reply »