Method of reducing corrosion using a warewashing composition
First Claim
1. A method of reducing corrosion of an article during cleaning, the method comprising:
- (a) diluting a warewashing composition with water at a dilution ratio of water to warewashing composition of at least about 20;
1 to form a use composition, wherein the warewashing composition comprises;
(i) a cleaning agent comprising a detersive amount of a surfactant;
(ii) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 when measured at a solids concentration of about 0.5 wt%; and
(iii) about 1 wt% to about 5 wt% of an unencapsulated corrosion inhibitor consisting of a mixture of a calcium salt and a magnesium salt, wherein the salt has a water solubility of less than about 0.5 wt% in water at about 20°
C. and atmospheric pressure;
and the corrosion inhibitor reduces the corrosion of glass; and
wherein the warewashing composition does not contain phosphorus-containing compounds; and
(b) contacting the article with the use composition in an automatic dishwashing machine, wherein the salt precipitates to form a protective layer on the article in contact with the use composition.
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Accused Products
Abstract
A warewashing composition includes a cleaning agent having a detersive amount of a surfactant, an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 when the use composition is measured at a solids concentration of about 0.5 wt %, and a corrosion inhibitor in an amount sufficient for reducing corrosion of glass when the warewashing composition is combined with water of dilution at a dilution ratio of at least about 20:1 water of dilution to detergent composition o form a use composition. The corrosion inhibitor includes a salt of calcium, magnesium, or a mixture of calcium and magnesium. The salt has a water solubility of less than about 0.5 wt % in water at about 20° C. and atmospheric pressure so that the salt precipitates to form a protective layer on a substrate in contact with the use composition. A method of reducing corrosion using the warewashing composition is also disclosed.
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Citations
11 Claims
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1. A method of reducing corrosion of an article during cleaning, the method comprising:
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(a) diluting a warewashing composition with water at a dilution ratio of water to warewashing composition of at least about 20;
1 to form a use composition, wherein the warewashing composition comprises;(i) a cleaning agent comprising a detersive amount of a surfactant; (ii) an alkaline source in an amount effective to provide a use composition having a pH of at least about 8 when measured at a solids concentration of about 0.5 wt%; and (iii) about 1 wt% to about 5 wt% of an unencapsulated corrosion inhibitor consisting of a mixture of a calcium salt and a magnesium salt, wherein the salt has a water solubility of less than about 0.5 wt% in water at about 20°
C. and atmospheric pressure;and the corrosion inhibitor reduces the corrosion of glass; and
wherein the warewashing composition does not contain phosphorus-containing compounds; and(b) contacting the article with the use composition in an automatic dishwashing machine, wherein the salt precipitates to form a protective layer on the article in contact with the use composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification