Abstract 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.
The improvement of claim 1 wherein said alkyl group of the glycosyl radical has 8 to 10 carbons.
Claim 2
Dependent Claim
19 words
The improvement of claim 1 wherein the alkyl glucosides and alkyl oligosaccharides contain one ethoxy unit per glycosyl unit.
Claim 3
Dependent Claim
19 words
The improvement of claim 1 wherein the alkyl glucosides and alkyl oligosaccharides contain two ethoxy units per glycosyl unit.
Claim 4
Dependent Claim
13 words
The improvement of claim 1 wherein said component is an oxide of silicon.
Claim 5
Dependent Claim
15 words
The improvement of claim 1 wherein (A) is a mixture of calcium and strontium ions.
Claim 6
Dependent Claim
25 words
The improvement of claim 1 wherein the synergistic corrosion inhibitor combination additionally is comprised of a third component, (C), which is a water-soluble naphthalene adduct.
Claim 7
Dependent Claim
19 words
The improvement of claim 7 wherein (C) is present in the amount of from 0.01 to 5.0 weight percent.
Claim 8
Dependent Claim
12 words
The improvement of claim 7 wherein (C) is ethyl methyl naphthalene sulfonate.
Claim 9
Dependent Claim
13 words
The improvement of claim 7 wherein (C) is 3 hydroxy 2 naphthoic acid.
Claim 10
Dependent Claim
12 words
The improvement of claim 7 wherein (C) is 2, 3 dihydroxy napthalene.
Claim 11
Dependent Claim
15 words
The improvement of claim 7 wherein (C) is the sodium salt of isopropyl naphthalene sulfonate.
Claim 12
Dependent Claim
15 words
The improvement of claim 7 wherein (C) is the sodium salt of dimethyl naphthalene sulfonate.
Claim 13
Dependent Claim
16 words
The improvement of claim 7 wherein (C) is the sodium salt of methyl propyl naphthalene sulfonate.