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Use of cellulose nanocrystals as a corrosion inhibitor

a technology of cellulose nanocrystals and corrosion inhibitors, which is applied in the field of cellulose nanocrystals as corrosion inhibitors, can solve the problems of relatively high cost of azole compounds, and achieve the effect of effective corrosion inhibition of the amount of charged cellulose nanocrystals

Inactive Publication Date: 2014-01-09
XAAN INNOVATIONS
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  • Abstract
  • Description
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  • Application Information

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Benefits of technology

The present invention provides a new way to prevent corrosion of metal equipment in water-related environments by using charged cellulose nanocrystals as a corrosion inhibitor. These nanocrystals can be charged either negatively or positively, and can act as an anodic or cathodic corrosion inhibitor to protect metal surfaces from corrosion. This approach overcomes the disadvantages of previous methods and offers a more effective and selective way to prevent corrosion.

Problems solved by technology

However, azole compounds are relatively expensive.

Method used

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  • Use of cellulose nanocrystals as a corrosion inhibitor

Examples

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Embodiment Construction

[0014]Cellulose nanocrystals are typically in the form of rod shaped fibrils or needles. The fibrils may, for example, have a length / diameter ratio of about 20 to 200, a diameter preferably less than about 60 nm, a diameter more preferably in the range of 4 nm to about 15 nm, and a length of about 150 nm to about 350 nm. Cellulose nanocrystals as referred to herein may alternatively be referred to as cellulose nanocrystals (trademark), cellulose nanofibres or cellulose whiskers. Dried forms of cellulose nanocrystals may obtained via acid hydrolysis, as for example set out in International Patent Publication No. WO 2010 / 066036 A1 to Beck et al., the disclosure of which is incorporated herein by reference. Cellulose nanocrystals may be purchased at CelluForce Inc., which has an office at 625 President Kennedy, Montreal, Québec, H3A 1K2.

[0015]According to one aspect, it has been discovered that cellulose nanocrystals are an effective corrosion inhibitor. Although this invention is not ...

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Abstract

The present invention relates to the use of charged cellulose nanocrystals as a corrosion inhibitor. According to one aspect, there is provided a corrosion inhibitor comprising of a plurality of charged cellulose nanocrystals fibrils. There is further provided a process for inhibiting corrosion of metal equipment where water can reside. According to a further aspect, the process includes adding an effective corrosion inhibiting amount of acid-form the cellulose nanocrystals. According to another aspect, the process includes selectively causing a first set of the cellulose nanocrystals to be negatively charged. The first set of the cellulose nanocrystals so charged function as an anodic corrosion inhibitor. The process includes selectively causing a second set of the cellulose nanocrystals to be positively charged. The second set of the cellulose nanocrystals so charged functions as a cathodic corrosion inhibitor.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of provisional application No. 61 / 668,001 filed in the United States Patent and Trademark Office on Jul. 4, 2012, the disclosure of which is incorporated herein by reference and priority to which is claimed.FIELD OF THE INVENTION[0002]The present invention relates to cellulose nanocrystals. In particular, the invention relates to the use of cellulose nanocrystals as a corrosion inhibitor.DESCRIPTION OF THE RELATED ART[0003]It is known per se to use azole compounds to inhibit corrosion. For example, U.S. Pat. No. 4,134,959 to Menke et al. provides a composition and method for inhibiting corrosion. The composition consists essentially of an azole and a water-soluble phosphate in an effective combination to inhibit corrosion in both ferrous and non-ferrous metals.[0004]However, azole compounds are relatively expensive. There is accordingly a need for an effective corrosion inhibitor that is less costly.BRIE...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M145/40C23F11/173
CPCC10M145/40C23F11/173B82Y30/00C10M171/06C10M173/00C10M2209/12C10N2020/063C10N2030/12C10N2040/22C23F11/149
Inventor GARNER, ANDREW
Owner XAAN INNOVATIONS
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