The Boeing Company

Teledyne Licensing, LLC

Teledyne Scientific and Imaging, LLC

Melitta M Hon

Martin William Kendig

Leslie F Warren, Jr

Young J Chung

Les Warren

Leslie Warren

A method for protecting a surface of an article includes preparing or otherwise providing a reactive solution of a form of polyaniline and an acid, thereafter applying the reactive solution to the surface of the article to form an adherent conversion coating on the surface, thereafter oxidizing the adherent conversion coating to form an oxidized coating, and thereafter contacting a chromate-free, corrosion inhibiting organic compound such as a salt of a dithiocarbamate or a salt of a dimercaptothiadiazole to the oxidized coating to form a fixed conversion coating on the surface of the article. The resulting article has the fixed conversion coating adhered to the surface of the article. The fixed conversion coating has a mixture of a reduced polyaniline salt, and a fixed disulfur-linked dithiocarbamate polymer or dimer.

Article having a hexavalent-chromium-free, corrosion-inhibiting organic conversion coating thereon, and its preparation

The corrosion inhibiting activity of a coating is determined from the effect of corrosion inhibiting species released by the coating on the oxygen reduction current for a cathode placed very close to the coating. A rotating disk electrode or pumped solution flow is used to sweep the corrosion inhibiting species from the coating surface to the cathode. The oxygen reduction current is measured under conditions of oxygen diffusion control.

Evaluation of the corrosion inhibiting activity of a coating

Compositions for actively inhibiting corrosion are described herein that include at least one active corrosion inhibitor compound, and at least one conventional corrosion inhibitor compound. In addition, methods for producing a composition that actively reduces corrosion are described herein and include providing at least one active corrosion inhibitor, providing at least one conventional corrosion inhibitor compound or corrosion protection compound, and blending the at least one active corrosion inhibitor and the at least one conventional corrosion inhibitor compound or corrosion protection compound to form the composition. In addition, a composition for actively inhibiting corrosion is described herein that includes at least one active corrosion inhibitor compound, wherein the at least one active corrosion inhibitor compound comprises a derivative or salt of a thio-, thia- or dithiocarbarnic acid, or a combination thereof and at least one conventional corrosion inhibitor compound. Coatings and composite materials containing these active corrosion inhibitor compounds and compositions are also described.

Corrosion inhibitors, methods of production and uses thereof

A method is provided for enhancing corrosion resistance of a metal surface that includes the step of forming a sol-gel coating in which nanostructured zinc phosphate (Zn(PO)) and zinc oxide (ZnO) phases are present in the mixture. The method may include the steps of mixing an organosilane, organometallic, organic acid, water, and alcohol, and allowing the components of the mixture to partially hydrolyze, followed by adding at least one component having zinc functionality and at least one component having phosphate functionality to the partially hydrolyzed mixture, wherein the zinc component and phosphate component are added in a molar ratio of from about 1.5:1 to about 5:1 (Zn:PO). The resulting mixture can be applied as a coating to a metal surface to improve the corrosion resistance of the metal and to enhance the adhesion of resinous materials to the metal surface.

Nano-structured inorganic zinc phosphate corrosion protective coating for metal alloys

A film which may be placed on a metallic substrate to inhibit corrosion of the substrate when in a corrosive environment. The film also inhibits corrosion at a defect area in the film when the substrate is exposed in the presence of a corrosive environment. The film includes dopants which release from the film when corrosion begins at a film defect. Therefore, the film not only inhibits corrosion where the film is undamaged, but also inhibits corrosion at the site of a defect in the film. Advantageously, the system does not lose its effectiveness over a given period of time if no defect occurs in the substrate.

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Daly City, CA, United States of America

Melitta M Hon