Compositions – Etching or brightening compositions – Inorganic acid containing
252 791, 216102, C09K 1306
Disclosed is an acidic cleaning aqueous solution for aluminum and aluminum alloy and a process for cleaning the same, intended to execute acidic cleaning without using harmful fluoride and chloride ions.
The oxidation-reduction potential of a cleaning bath is controlled to be at 0.5 to 0.8 V (vs. Ag-AgCl). The cleaning bath is obtained by diluting an acidic cleaning aqueous solution for aluminum and aluminum alloy to a predetermined volume. The acidic cleaning aqueous solution contains specified amounts of at least one of inorganic acids, Br.sup.- ions and oxidized metal ions, with the addition of a surfactant and oxidizing agent if necessary.
It is thus possible to present a uniform etching effect irrespective of low temperature (below 60.degree. C.) without containing fluoride ions and chromic ions within the acidic cleaning aqueous solution. Br.sup.- also has an effect of inhibiting the oxidation-decomposition reaction of the surfactant arising from the oxidizing agent and oxidized metal ions, thereby obtaining a long-life acidic cleaning aqueous solution.
patent: 2477181 (1949-07-01), Holman
patent: 3607484 (1971-09-01), Marakawa et al.
patent: 3663441 (1972-05-01), Gulla
patent: 3869303 (1975-03-01), Orlor et al.
patent: 4728456 (1988-03-01), Yamasoe et al.
patent: 4851148 (1989-07-01), Yamasoe et al.
patent: 4883541 (1989-11-01), Tadros
"Effect of Additives of Potassium Habides On The Dimensional Etching of Copper In Chromic Acid Solutions"; Shmeliy et al.; 1980; abstract only; Zh Prikl, Khim, 53(7).
Dialogue Information Services Abstract for Japanese Patent Application No. 72039823.
Breneman R. Bruce
Nippon Paint Co. Ltd.
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