Acidic cleaning aqueous solution for aluminum and aluminum alloy

Compositions – Etching or brightening compositions – Inorganic acid containing

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252 791, 216102, C09K 1306

Patent

active

055142931

ABSTRACT:
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.

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"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.

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