Method for inhibiting metal corrosion during acid cleaning or pickling
AssigneeKing Fahd University of Petroleum and Minerals
InventorsMoses M. Solomon, Saviour A. Umoren
Life of this patent
Estimating the term…
Abstract
A corrosion inhibitor composition, which includes i) an aqueous alcohol base fluid, ii) a mixture of at least three polysaccharides selected from carboxymethyl cellulose, gum arabic, pectin, a salt of alginic acid, chitosan, dextran, hydroxyethyl cellulose, and soluble starch, with each polysaccharide that is present in the mixture being present in an amount of 0.05 to 0.5 wt. %, based on a total weight of the corrosion inhibitor composition, iii) silver nanoparticles, and iv) a pineapple leaves extract. A method of inhibiting corrosion of metal during acid cleaning/pickling whereby the metal is treated with an acidic treatment fluid containing an acid and the corrosion inhibitor composition.
Claims8
A method of inhibiting corrosion of metal during acid cleaning/pickling, the method comprising:
- treating the metal with an acidic treatment fluid comprising 1 to 5 wt. % of an acid, based on a total weight of the acidic treatment fluid, and 0.1 to 5 vol. % of a corrosion inhibitor composition based on a total volume of the acidic treatment fluid
- wherein the corrosion inhibitor composition comprises:
- a base fluid comprising water and an alcohol;
- a mixture of at least three polysaccharides selected from the group consisting of carboxymethyl cellulose, gum arabic, pectin, a salt of alginic acid, chitosan, dextran, hydroxyethyl cellulose, and soluble starch, with each polysaccharide that is present in the mixture being present in an amount of 0.05 to 0.5 wt. %, based on a total weight of the corrosion inhibitor composition;
- silver nanoparticles;
- and
- a pineapple leaves extract,
- wherein the corrosion inhibitor composition provides a hydrodynamic corrosion rate of less than 0.0008 mpy on Grade-2 Ti when applied at a concentration of 0.3-1 wt % after 168 hours of exposure to a 2% HCl solution in seawater at a temperature of 40-70° C.
Dependencies are inferred from the claim text.