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US 5,174,870 AGranted
Electrocleaning method
AssigneePCT Technology, Inc.
InventorJeff Puma
Life of this patent
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Abstract
A liquid concentrate composition for use in the cleaning of a surface comprises a mixture of sodium di-isopropyl naphthalene sulfonate, trisodium nitrilotriacetate and sodium diethanolglycinate.
Claims2
An electrochemical cleaning method to remove oxide film from a metal surface to be cleaned to permit plateability of a metal onto said cleaned metal surface comprising:
- (1) providing an aqueous composition bath comprising:
- (A) from 0.5 percent to 10 percent by weight of a liquid concentrate mixture comprising;
- (a) from 40 percent to 80 percent by weight of the alkali metal salt of a dialkyl naphthalene sulfonate, each of said alkyl having from 1 to 8 carbon atoms;
- (b) from 10 percent to 30 percent by weight of the alkali metal salt of nitrilotriacetic acid or of ethylene diamine tetracetic acid;
- (c) from 10 percent to 30 percent by weight of the alkali metal salt of N,N-diethanol glycine;
- and
- wherein the weight of each of (a), (b) and (c) is based upon the total weight of the liquid concentrate;
- and
- (B) from 90 percent to 99.5 percent by weight of water;
- wherein the weight of each of (A) and (B) is based upon the total weight of the aqueous composition bath;
- and
- (2) immersing a metal surface to be cleaned into said aqueous solution composition bath.
9 more elements
Dependencies are inferred from the claim text.