Metal cleaner with novel anti-corrosion system
AssigneeChurch & Dwight Co., Inc.
InventorsSteven Dunn, Anthony Winston
Life of this patent
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Abstract
A metal cleaning composition useful in aqueous solution comprises an alkalinity providing agent and a corrosion inhibitor comprising magnesium ions, zinc ions or both. The corrosion inhibitor is provided in the form of magnesium or zinc compounds such as magnesium oxide or water soluble salts thereof.
Claims58
A method of cleaning aluminum or aluminum alloy substrates so as to remove contaminants therefrom comprising:
- contacting said substrates with an aqueous cleaning solution comprising a metal cleaning composition in water, said metal cleaning composition containing an alkoxylated thiol surfactant, and an N-alkyl pyrrolidone surfactant, an alkalinity providing agent and a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions and mixtures thereof, said contacting occuring for a sufficient time to remove said contaminants from said substrates.
A method of cleaning metal substrates so as to remove contaminants therefrom comprising:
- contacting said substrates with an aqueous cleaning solution comprising a metal cleaning composition in water, said metal cleaning composition comprising an alkoxylated thiol surfactant, an N-alkyl pyrrolidone surfactant, an alkalinity providing agent, a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions and mixtures thereof and a carboxylated polymer to maintain said corrosion inhibitor in solution.
An aqueous metal cleaning solution comprising 0.1 to 20 wt. % of a metal cleaning composition and the balance water, said metal cleaning composition comprising an alkoxylated thiol surfactant, N-alkyl pyrrolidone surfactant, an alkalinity providing agent, a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions and a mixture thereof, and a carboxylated polymer to maintain said corrosion inhibitor in solution, said solution having a pH of from 7.5 to 11.0.
An aqueous metal cleaning concentrate comprising:
- 5-45 wt. % of a metal cleaning composition and the balance water, said metal cleaning composition comprising an alkoxylated thiol surfactant, an N-alkyl pyrrolidone surfactant, an alkalinity providing agent, a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions and mixtures thereof and a carboxylated polymer to maintain said corrosion inhibitor in solution.
An aqueous metal cleaning composition comprising:
- 5 to 80 wt. % of an ethoxylated alkyl thiol surfactant having 7 to 20 carbon atoms and ethoxylated with 3 to 15 ethylene oxide units, an N-alkyl pyrrolidone surfactant, 20 to 80 wt. % of an alkalinity providing agent, 0.1 to 10 wt. % of a corrosion inhibitor selected from the group consisting of magnesium ions, zinc ions and mixtures thereof and a carboxylated polymer to maintain said corrosion inhibitor in aqueous solution.
An aqueous metal cleaning concentrate comprising:
- 5-45 wt. % of a metal cleaning composition and the balance water, said metal cleaning composition comprising an alkoxylated thiol surfactant, and an N-alkyl pyrrolidone surfactant, an alkalinity providing agent selected from the group consisting of alkali metal carbonate, alkali metal bicarbonate and mixtures thereof, a corrosion inhibitor in the form of magnesium oxide, and a carboxylated polymer to maintain said corrosion inhibitor in solution.
Dependencies are inferred from the claim text.