Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Composition for the controlled release of inhibitors for corrosion, biofouling, and scaling

a technology of inhibitors and compounds, applied in anti-corrosion paints, thin material processing, transportation and packaging, etc., can solve the problems of chromate toxic, metal structure or substrate may become corroded or oxidized, and reduce its availability, so as to prevent scaling and biofouling, and prevent corrosion of the substrate

Inactive Publication Date: 2005-09-15
THE BOEING CO
View PDF22 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a corrosion inhibiting composition that can be applied to metallic substrates to prevent corrosion and scaling in a variety of environments. The composition includes a conductive polymer and an anionic dopant that acts as an active inhibitor of corrosion. The dopant can migrate to defects in the coating and actively inhibit corrosion at those locations. The composition can be applied as a coating or in the form of a composite material that also acts as a resin matrix. The invention also includes a method of coating the corrosion-inhibiting composition onto metallic substrates and a system for inhibiting corrosion in the presence of imperfections in the coating. The invention can help prevent damage to metallic substrates and provide a marker or indication of corrosion.

Problems solved by technology

In many applications, a metal structure or substrate may become corroded or oxidized when exposed to a particular atmosphere.
Nevertheless, a slow release of the chromate over time can reduce its availability to be released at the appropriate time.
Although chromate is useful in this application, chromate may be toxic if ingested in sufficient amounts in a living organism.
Therefore, strict and costly standards must be adhered to when using and disposing of the materials coated with the chromate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Composition for the controlled release of inhibitors for corrosion, biofouling, and scaling
  • Composition for the controlled release of inhibitors for corrosion, biofouling, and scaling
  • Composition for the controlled release of inhibitors for corrosion, biofouling, and scaling

Examples

Experimental program
Comparison scheme
Effect test

example 1

Application of PANI Polymer

[0064] 10 to 20 gm of polyaniline emeraldine base, the oxidized unprotonated form of polyaniline (PANI), which may be obtained from Aldrich, is dissolved in 100 ml of N-methylpyrrolidone so as to make a thick paint-like suspension. A No. 13 Meyer bar is used to draw a portion of the solution into a film covering a surface of an Al 2024-T3 aluminum alloy test panel, which may be prepared as described herein, and allowed to dry and cure to form the solid film of PANI. The PANI film includes a polymeric structure that allows for the transfer of electrons through the film once the film is protonated. With reference to FIG. 3, the PANI film may have a general structure that is reduced and unprotonated (that is also non-conducting) represented by 30. The reduced and unprotonated PANI film 30 also has, and is generally received in, an oxidized and unprotonated or basic form (emeraldine base, which is non-conducting) PANI 32, wherein at least one of the nitrogens...

example 2

Application of PANI Polymer from Solution

[0065] A three inch by three inch (76.2 mm×76.2 mm) test panel of aluminum alloy Al2024-T3 was first degreased with acetone and deoxidized in Sanchem 1000®, available from Sanchem, Inc., Chicago, Ill., at about 37° C. for about 15 minutes folloed by a de-ionized water rinse. The panel was then dried and coated (FIG. 21) with oxidized PANI (emeraldine base) dissolved in a 80:20 formic acid:dichloroacetic acid solution that is spray coated. The acidic solution chemically anodizes the alloy as evidenced by its transient color change during drying. The excess acids volatilize. The color returns to the dark oxidized form as a result of air reoxidation. Hence, the resulting film remains reactive. Subsequent treatment of the resulting surface with an aqueous solution of a dithiocarbamate, here ammonium 1-pyrrolidine dithiocarbamate fixes, by oxidative polymerization, an insoluble disulfide linked polymer of the dithiocarbamate on the surface and wi...

example 3

Doping of the PANI Polymer

[0066] A three inch by three inch (3″×3″) (76.2 mm.×76.2 mm) test panel of aluminum alloy Al2024-T3− is first degreased with acetone and deoxidized in Sanchem 1000® at about 37° C. for about 15 minutes followed by a de-ionized water rinse. The panel is then dried and coated with oxidized PANI 32 as prepared and described above. The coating of the oxidized PANI 32 is allowed to air dry and cure at room temperature. The PANI coating is then doped with 2,5 dimercapto-1,3,4,-thiadiazole (2,5 dopant).

[0067] The 2,5 dopant is provided at a concentration of about 0.02M. The 2,5 dopant is placed in a sealed and gasketed cell such that approximately 8 cm2 of the test panel is exposed to the 2,5 dopant. The 2,5 dopant is expected to reduce the oxidized PANI 32 and dope the coating via reaction 34. The cell is affixed to the test panel for approximately 24 hours. After the 24 hour exposure period, the cell is removed and the panel rinsed and dried. After the doping ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
surface areaaaaaaaaaaa
current densityaaaaaaaaaa
current densityaaaaaaaaaa
Login to View More

Abstract

A polymer composite structure, wherein the composition releases an anionic dopant upon application of an electrochemical potential, such as when in contact with a metallic substrate in a corrosive environment. The composite actively inhibits corrosion at the point of contact of the composite with a metal substrate by release of “active” or “smart” corrosion inhibitors which migrate to the corrosion area. Composites having anionic dopants having biocidal or scale-inhibiting properties may be used to inhibit biofouling and scaling wherein the dopants are released upon application of a electrochemical potential.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a continuation-in-part application and claims the benefit of U.S. patent application Ser. No. 10 / 190,932, filed Jul. 8, 2002, which is hereby incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to coatings and composites that inhibit biofouling, scaling, and corrosion, and more particularly relates to coatings and composites that inhibit biofouling, scaling and corrosion when in galvanic contact therewith as well as when coated thereon. BACKGROUND OF THE INVENTION [0003] In many applications, a metal structure or substrate may become corroded or oxidized when exposed to a particular atmosphere. Precautions can be taken to prevent such corrosion, but generally it occurs if a particular metal is exposed to a particular environment for an extended period of time. Many applications exist, such as automotive bodies and frames and aerospace application, where metal structures of vehi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/08C23F11/16
CPCC09D5/08C23F11/165C23F11/161Y10T428/31504
Inventor KENDIG, MARTIN W.HON, MELITTA M.WARREN, LESLIE F. JR.
Owner THE BOEING CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com