Corrosion inhibition method suitable for use in potable water
AssigneeA.S. Incorporated
InventorOlen L. Riggs JR.
Life of this patent
Estimating the term…
Abstract
Effective corrosion inhibitors having minimal organic content, particularly suitable for use in municipal drinking water systems, are described. The corrosion inhibiting additive is a stannous salt of a non-carbon acid.
Claims24
A method for inhibiting corrosion of corrodible metal in contact with water in a distributive water system, comprising
- (a) adding to said water system, a composition consisting essentially of a stannous salt of a non-carbon acid, or an aqueous solution thereof,
- and (b) maintaining in said water system a concentration of said stannous salt which corresponds to a concentration of tin between about 0.01 ppm and about 75 ppm.
A method for inhibiting corrosion of corrodible metal in contact with water in a distributive water system, comprising
- (a) adding to said water system, a composition consisting essentially of (i) a stannous salt of a non-carbon acid, or an aqueous solution thereof, abd (ii) an alkali metal phosphate selected from a pyrophosphate, an orthophosphate, a hexametaphosphate, a hypophosphate, and a polyphosphate,
- and (b) maintaining in said water system a concentration of said stannous salt which corresponds to a concentration of tin between about 0.01 ppm and about 75 ppm.
A metal corrosion inhibiting composition for use in a distributive water system, consisting essentially of (i) a stannous salt of a non-carbon acid or an aqueous solution thereof, and (ii) an alkali metal phosphate selected from a pyrophosphate, an orthophosphate, a hexametaphosphate, a hypophosphate, and a polyphosphate.
Dependencies are inferred from the claim text.