Inhibiting corrosion with fractions of corn stillage

• US 9,327,311 B1
• Filed: 06/23/2014
• Issued: 05/03/2016
• Est. Priority Date: 05/06/2011
• Status: Active Grant

• Current Assignee: Cortec Corporation
• Original Assignee: Cortec Corporation
• Inventors: Kharshan, Margarita, Furman, Alla, Gillette, Kristy, Kean, Robert
• Primary Examiner(s): Turocy, David
• Application Number:
  US14/311,510
• Time in Patent Office: 680 Days
• US Class Current: 1/1
• CPC Class Codes: B05D 1/20 substances to be applied floating on a fluid
• CPC Class Codes: B05D 1/36 Successively applying liquids or other fluent materials, e.g. without intermediate treatment
• CPC Class Codes: B05D 7/14 to metal, e.g. car bodies involving a chemical reaction between the metal and the coating C23
• CPC Class Codes: C09D 103/00 Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
• CPC Class Codes: C09D 105/00 Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00
• CPC Class Codes: C23F 11/04 in markedly acid liquids
• CPC Class Codes: C23F 11/10 using organic inhibitors
• CPC Class Codes: C23G 1/06 organic inhibitors
• CPC Class Codes: C23G 1/081 solutions containing H2SO4
• CPC Class Codes: C23G 1/083 solutions containing H3PO4
• CPC Class Codes: C23G 1/088 solutions containing organic acids

Abstract

A bio-based corrosion inhibitor composition includes a corn stillage product, and may be a substantially water insoluble fraction of corn stillage. The corrosion inhibitor composition is useful in protecting metal articles from corrosion.

Claims

1. A method for inhibiting corrosion of a metal article, said method comprising:

(a) preparing a float coat having a specific gravity of less than 1.0 g/cm³ and including a liquidus fraction of corn stillage;

(b) combining said float coat with an aqueous composition to form a treatment bath, wherein said float coat is substantially immiscible in said aqueous composition; and

(c) applying said treatment bath to the metal article.

2. A method as in claim 1 wherein the metal article is a vessel.

3. A method as in claim 2, including filling the vessel with said treatment bath in a manner that permits said float coat to float upon said aqueous composition.

4. A method as in claim 3, including, subsequent to filling the vessel with said treatment bath, removing said aqueous composition from the vessel.

5. A method as in claim 1 wherein said liquidus fraction of said corn stillage includes crude corn oil.

6. A method as in claim 1 wherein said liquidus fraction of corn stillage includes an oily extract of DDGS.

7. A method as in claim 1 wherein said aqueous composition is effective in one or more of pickling, acid cleaning, and removing rust of said metal article.

8. A method as in claim 1 wherein said aqueous composition includes metal cleaning agents.

9. A method as in claim 8, including passing the metal article through said treatment bath such that the metal contacts said float coat subsequent to contact with said aqueous composition.