Protective treatment of a zinc or a zinc alloy surface
AssigneeInternational Business Machines Corporation
InventorsVittorio Sirtori, Franco Zambon, Pietro Luigi Cavallotti, Luca Magagnin
Life of this patent
Estimating the term…
Abstract
A method and a bath for protecting a Zn or Zn alloy surface against the corrosion and oxidation and for improving the wettability characteristics of a Zn or Zn alloy surface with a Sn solder alloy. The method is particularly useful in the manufacture of electronic components, when the deposition of a thin layer of Zn or Zn alloy is needed before the deposition of the Sn alloy (particularly Pb free) to improve the solderability characteristics of the Cu surface.
Claims5
A method for protecting a metal surface, said metal consisting essentially of Zn or a mixture of Sn and Zn, comprising the steps of:
- immersing the metal surface in an alcoholic solution consisting essentially of an alcohol, a compound of the azole family in the quantity of 0.005 to 3 mol/liter and about 0.1 to 0.3 vol. % surfactant,
- rinsing the metal surface with isopropanol;
- and
- drying the rinsed metal surface in a nitrogen atmosphere.
A method for protecting a metal surface, said metal consisting essentially of Zn or a mixture of Sn and Zn, comprising the step of:
- immersing the metal surface in an alcoholic solution consisting essentially of an alcohol, a compound of the azole family in the quantity of about 1 mol/liter and about 0.1 to 0.3 vol. % surfactant.
Dependencies are inferred from the claim text.