Corrosion-inhibiting sol-gel coating systems and methods

A corrosion-inhibiting, sol-based technology, applied in the direction of anti-corrosion coatings, coatings, liquid chemical plating, etc., can solve problems such as unobtrusive development, complicating the threat of corrosion, and loss of sealant integrity

Inactive Publication Date: 2016-06-01
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The threat of corrosion is compounded by the loss of sealant integrity, which is often opaque and obscures metal surfaces
Therefore, corrosion that begins due to loss of sealant integrity may be hidden and may develop unnoticed

Method used

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  • Corrosion-inhibiting sol-gel coating systems and methods
  • Corrosion-inhibiting sol-gel coating systems and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The disulfide corrosion inhibitor 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) (as 829 commercially available from Vanderbilt Chemicals, LLC) was dissolved in THF and then added to a sol solution of zirconium tetrapropanolate (also known as zirconium tetra-n-propoxide) to produce % concentration of mixed sol solutions of disulfide corrosion inhibitors. Sol solution is a commercial product 3M TM Surface Pretreatment AC-131. 3M TM Surface Pretreatment AC-131 is a silicon-zirconium based sol solution comprising a mixture of about 2% organosilane and about 1% zirconium alkoxide.

[0052] Four 2024-T3 aluminum alloy panels were coated with ScotchBrite TM Pad sanding. One panel was chromium conversion coated to serve as a positive control (known corrosion resistance). One board sprayed with 3M TM The surface was pretreated with AC-131 to serve as a negative control (known corrosion sensitivity). The other two panels were sprayed with mixed sol solutions to form a 0....

Embodiment 2

[0054] The disulfide corrosion inhibitor 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione)( 829) was dissolved in THF and then added to 3M TM Surfaces were pretreated in AC-131 to produce disulfide corrosion inhibitors at concentrations of 3% and 6%. At the 6% corrosion inhibitor concentration, all disulfide corrosion inhibitors did not dissolve, so only the 3% corrosion inhibitor concentration was further evaluated. Aluminum alloy panels were prepared and tested as in Example 1. Panels were inspected after 24 hours of neutral salt spray exposure. 3% of the samples exhibited superior corrosion protection compared to the negative control, where almost no pitting was observed. The negative control had a corrosion rating of 0; 3% of the samples had a corrosion rating of about 9 (ASTM1654-08, procedure B). A separately prepared 3% of the samples were subjected to the wet tape test for paint adhesion.

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Abstract

The invention relates to corrosion-inhibiting sol-gel coating systems and methods. Corrosion-inhibiting coating materials comprise a sol-gel and a corrosion-inhibiting compound with at least one disulfide group. The corrosion-inhibiting compound is contained within the sol-gel. Coated and/or laminated structures may include the corrosion-inhibiting coating materials on a metal substrate, and may include a secondary layer (e.g., a paint, etc.) adhered to the coating material opposite the metal substrate. Methods of forming a corrosion-inhibiting sol-gel comprise mixing organo-metallic compounds and the corrosion-inhibiting compound into a sol solution and incubating (e.g., reacting) the sol solution to form the corrosion-inhibiting sol-gel with the corrosion-inhibiting compound contained within the sol-gel. Generally, corrosion-inhibiting coating materials are hexavalent chromium free.

Description

technical field [0001] The present disclosure relates to corrosion inhibiting sol-gel coating systems and methods. Background technique [0002] Corrosion damage is an expensive problem for metals exposed to the environment. Therefore, many solutions have been tried to prevent or reduce the effects of corrosion. [0003] Chemically, metal corrosion can be described as a paired electrochemical reaction consisting of anodic metal oxidation and cathodic oxidant reduction. Metallic materials corrode in a variety of gaseous and / or aqueous environments such as moist air in the atmosphere. Specifically, metallic materials are susceptible to corrosion due to galvanic coupling, i.e., when two materials of different electrochemical potentials (e.g. dissimilar metals) are electrically connected in the presence of an electrolyte (e.g. water with dissolved salts) Time. Galvanic corrosion can occur on a macro scale, such as between different metal components, or on a micro scale, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/02C09D7/46C09D7/48C09D7/63
CPCC09D5/08C08K5/56C09D5/086C09D7/63C09D165/00C23C18/1241C23C18/1254C23C26/00C23C28/00C08L81/04C09D7/65C09D7/48C23C18/00
Inventor P·J·肯伦L·M·劳力仕E·杰克逊
Owner THE BOEING CO
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