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US 4,176,071 AGranted
Corrosion inhibitor mixture for ammonium sulfate fire-retardant compositions and method for inhibiting corrosivity of such compositions
AssigneeEarly California Industries, Inc.
InventorRobert L. Crouch
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Abstract
A corrosion inhibitor mixture for ammonium sulfate-based fire-retardant compositions includes a water-soluble cyanide compound and ammonium phosphate.
Claims2
A corrosion inhibitor mixture for ammonium sulfate fire-retardant compositions, said compositions generally including
- ammonium sulfate,
- a thickening agent, and
- water,
- said mixture comprising:
- (a) a water-soluble cyanide compound;
- and
- (b) a water-soluble ortho-phosphate compound,
- said components of said corrosion inhibitor system being present in said fire-retardant composition in a minor effective amount at least sufficient to inhibit the corrosivity of said fire-retardant composition to aluminum, mild steel and brass to less than 1 mil per year.
5 more elements
A method for inhibiting the corrosivity of ammonium sulfate fire-retardant compositions comprising the step of incorporating therein a corrosion inhibitor mixture, including
- (a) a water-soluble cyanide compound;
- and
- (b) ammonium phosphate,
- said corrosion inhibitor mixture being present in said composition in a minor effective amount at least sufficient to inhibit the corrosivity of said fire-retardant composition to aluminum, mild steel and brass to less than 1 mil per year.
1 more element
Dependencies are inferred from the claim text.