Alkaline cleaner for cleaning aluminum surfaces

摘要

Composition for cleaning surfaces which are susceptible to corrosion in alkaline liquids, comprising at least one alkalinity source, at least one inorganic salt containing at least one cation selected from the elements of the second or third main group of the periodic table of the elements, and whereby the composition is free of any triazole and/or any alkali metal borate, aqueous concentrate comprising the composition, use solutions comprising the composition or the aqueous concentrate and method of cleaning surfaces which are susceptible to corrosion in alkaline liquids using the above aqueous concentrate or any of the above use solutions.

主权项

1. A composition for cleaning surfaces which are susceptible to corrosion in alkaline liquids, comprising, in admixture and contacting one another:
1 to 40 wt. % at least one alkalinity source selected from the group consisting of alkali metal carbonates, alkali metal bicarbonates, and mixtures thereof; 0.01 to 20 wt. % at least one inorganic salt containing at least one cation selected from a group consisting of Mg2+, Ca2+, Sr2+, Ba2+, Al3+ or mixtures thereof and an anionic counterion to the cation selected from the group comprising halides and sulfate; and 2 to 35 wt. % a phosphonoalkane polycarboxylic acid or its salt as sequestrant; wherein:
the composition is free of any compound containing silicon, any triazole, any alkali metal borate or combination thereof;the composition is non-foaming;the composition is present in the form of a powder or a solid block.