| 摘要 |
Materials which are sensitive to the attack of alkaline solutions are protected by a synergistic combination of: (1) at least one metal ion selected from the group consisting of barium, calcium and strontium with (2) at least one surface-active agent selected from the group consisting of (A) alkyl glycosides having a formula corresponding to ROGmH, wherein G is a glycosyl radical, R is an alkyl radical of six to 16 carbons connected to the number 1 carbon atom of glycosyl radical through the oxygen and m is an integer in the range of 1 to about 4, (B) ethylene oxide adducts of said alkyl glycosides containing up to two ethylene oxide units per glycosyl radical and (C) amino carboxylic acids having an alkyl radical of at least 10 carbons and metal salts of amino carboxylic acids in alkaline solutions used for cleaning. Optionally in certain applications, and essentially in other applications, a third element may be made a part of the synergistic combination, namely (3) a water soluble naphthalene derivative.
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