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US 11,634,635 B2Granted
Polyacrylate polymers for low carbon steel corrosion control
AssigneeBl Technologies, Inc.
InventorPaul Robert Frail
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Abstract
Methods are provided to inhibit corrosion in low hardness water systems. The corrosion inhibiting treatment comprises: calcium salts of low molecular weight polymer polycarboxylic acids. These calcium salts may be added preformed to the water system in need of treatment or formed in-situ in the system. This method of corrosion inhibition is not a source of addition phosphorous or heavy metal to the treated system.
Claims13
A method of inhibiting corrosion of metals in contact with an aqueous system, the method comprising:
- adding a corrosion inhibiting polymeric polycarboxylate to an aqueous system,
- wherein said polymeric polycarboxylate is selected from the group consisting of homopolymers, co-polymers, ter-polymers, or quad-polymers,
- wherein said co-polymers, ter-polymers or quad-polymers of said polymeric polycarboxylate consist of monomers selected from the group consisting of acrylic acid, epoxy succinic acid, maleic acid, itaconic acid, vinyl glyceral ether, glyceral diol, and methacrylic acid;
- and
- wherein said polymeric polycarboxylate is a calcium salt of the polymeric polycarboxylate formed by the reaction of an essentially acidic precursor with an inorganic calcium salt;
- and
- wherein said polymeric polycarboxylate is added to said aqueous system at doses of between 1-1000 ppm,
- and wherein (i) the aqueous system comprises a calcium concentration less than 200 ppm of hardness, and the polymeric polycarboxylate has an average molecular weight of at least 4660 g, or (ii) the aqueous system comprises a calcium concentration from about 200 ppm to about 400 ppm of hardness, and the polymeric carboxylate has an average molecular weight from about 2000 g to about 2500 g.
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Dependencies are inferred from the claim text.