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US 11,851,598 B2Granted
Corrosion inhibition method for inorganic acidic media
AssigneeKing Fahd University of Petroleum and Minerals
InventorsIsmail Abdulazeez, Othman Al-Hamouz, Abdulaziz Al-Saadi, Mazen Khaled
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Abstract
Methods for preventing, inhibiting, or reducing metal (e.g. mild steel) corrosion in aqueous media utilizing a water-soluble formulation having a polyurea pre-dissolved in a polar aprotic solvent are described. The polyurea contains reacted units of a diisocyanate and a diaminoalkane. The effectiveness of the methods is demonstrated by corrosion inhibition efficiency and corrosion rate of metallic substrates in aqueous acidic environments using the water-soluble formulation.
Claims12
A corrosion inhibition method for a metallic substrate, comprising:
- immersing the metallic substrate in an aqueous corrosive medium which comprises at least one acid selected from the group consisting of hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and phosphoric acid,
- introducing a formulation comprising a polyurea pre-dissolved in a polar aprotic solvent into the aqueous corrosive medium in contact with the metallic substrate,
- wherein:
- the formulation is devoid of epoxy ester resin;
- the polyurea comprises reacted units of a diaminoalkane and a diisocyanate;
- and
- the polar aprotic solvent is at least one selected from the group consisting of N-methyl-2-pyrrolidone, dimethylformamide, dimethyl sulfoxide, and 1,3-dimethyl-2-imidazolidinone.
4 more elements
Dependencies are inferred from the claim text.