US 11,718,918 B2
Method for inhibiting metal corrosion during acid cleaning or pickling
Moses M. Solomon, Dhahran (SA); and Saviour A. Umoren, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Jun. 15, 2022, as Appl. No. 17/840,663.
Application 17/840,663 is a division of application No. 16/526,021, filed on Jul. 30, 2019, granted, now 11,408,079.
Prior Publication US 2022/0316073 A1, Oct. 6, 2022
Int. Cl. C09K 8/54 (2006.01); C09K 8/08 (2006.01); C23F 11/173 (2006.01); C08L 5/02 (2006.01); C08L 1/28 (2006.01); C08L 5/06 (2006.01); C08K 3/08 (2006.01); C23G 1/06 (2006.01); C08L 5/04 (2006.01)
CPC C23F 11/173 (2013.01) [C08K 3/08 (2013.01); C08L 1/286 (2013.01); C08L 5/02 (2013.01); C08L 5/04 (2013.01); C08L 5/06 (2013.01); C23G 1/063 (2013.01); C08K 2003/0806 (2013.01); C08K 2201/003 (2013.01); C08L 2201/08 (2013.01)] 8 Claims
 
1. 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.