Patent ID: 7384902
Filing Date: 2008-06-10
Classification: C11D,C23F,C23G

Abstract:
1. An alkaline brightening and cleaning composition for metal surfaces, the composition providing etching of aluminum without adversely effecting other, non-metallic surfaces, comprising: an alkali metal hydroxide having a concentration of substantially 1.6 to 16 g/l; a polycarboxylic acid having the formula (CH an alkali metal salt of an organic acid selected from the group consisting of sodium gluconate and sodium glucoheptonate having a concentration of substantially 1.4 to 14 g/l; a first, amphoteric surfactant having a concentration of substantially 0.03 to 3 g/l; a second, betaine surfactant; a third, nonionic surfactant, the second betaine surfactant and the third nonionic surfactant having a combined concentration of substantially 0.1 to 1.8 g/l; and the balance being water, wherein the ratio of the alkali metal hydroxide or the alkali metal salt of an organic acid to the polycarboxylic acid is substantially from 0.6:1 to 6:1.