Compositions – Etching or brightening compositions
Patent
1995-08-30
1999-06-15
Breneman, R. Bruce
Compositions
Etching or brightening compositions
252 792, 252 794, C09K 1300, C09K 1304, C09K 1306
Patent
active
059119071
ABSTRACT:
A composition and method for stripping tin or tin-lead alloys, and any underlying copper-tin intermetallic, from a copper surface. The composition includes an aqueous solution of approximately 5-60% nitric acid by weight, approximately 0.5-30% ferric nitrate by weight, and a nitric acid stabilizer selected from the group consisting of an amino-triazole, an amino-isoxazole, and a linear amino sulfone in the form H.sub.2 N--SO.sub.2 --R, where R is any alkyl or benzene group, wherein the stabilizer is present at a concentration sufficient to inhibit exothermic conditions, emission of toxic NOx gas, and copper attack. A soluble source of halogen ion, such as hydrochloric acid, can be added to the composition to yield a uniform, reflective, bright pink copper appearance, and to further reduce sludge formation. In addition, sludge formation can be eliminated by adding a soluble source of sulfate ion (SO.sub.4.sup.-2) to the composition.
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Breneman R. Bruce
Goudreau George
Surface Tek Specialty Products, Inc.
Zeman Laura J.
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