Solution for stripping a layer of tin or tin-lead alloy from a s

Details Solution for stripping a layer of tin or tin-lead alloy from a s Solution for stripping a layer of tin or tin-lead alloy from a s

1982-09-21

1984-03-27

Massie, Jerome W.

Compositions

Etching or brightening compositions

156664, 134 3, 252149, 252151, C09K 1300

Patent

active

044393385

ABSTRACT:
The invention relates to a chemical solution capable of selectively stripping a layer of tin or tin-lead alloy from a substrate, generally of copper, by means of a spraying operation, without requiring the use of any specially designed machine, inasmuch as the solution does not exhibit any particular aggressiveness in respect of the metal materials of which the spraying machines are usually made, and is nevertheless able to selectively strip and maintain in solution the tin or the tin-lead alloy, without etching the copper substrate. The solution comprises mainly an acid of organic nature appertaining to the group including the class of the alkylsulfonic acids having a number of carbon atoms from 1 to 4, such as in particular the methanesulfonic acid. The solution also contains an aromatic nitro-substituted compound including a solubilizing group, which is adapted to oxidize the tin-lead alloy and to facilitate the etching action of the organic acid. A further component of the solution is formed by thiourea or alkyl-substituted or aryl-substituted thioureas, whose function consists in preventing the tin from being deposited again onto the copper substrate.

REFERENCES:
patent: 2698781 (1955-01-01), Meyer
patent: 2956956 (1960-10-01), Strauss
patent: 3365401 (1968-01-01), Saubestre et al.
patent: 3677949 (1972-07-01), Brindisi et al.
patent: 4004956 (1977-01-01), Brindisi, Jr.
patent: 4009299 (1977-02-01), Flowers et al.
patent: 4374744 (1983-02-01), Kawanabe et al.
patent: 4397753 (1983-08-01), Czaja

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