United Technologies Corporation

Promila Bhatia

Mark R Jaworowski

Xia Tang

Joseph Parkos, Jr

Weilong Zhang

Foster Philip Lamm

Gary M Lomasney

Xiaomei Yu

Thomas J Garosshen

Xiaoyuan Chang

Thomas R Hanlon

Henry M Hodgens

Amy Besing

Mike A Kryzman

Thomas Garosshen

A non-carcinogenic corrosion inhibiting additive includes an anodic corrosion inhibitor and/or a cathodic corrosion inhibitor and a solubility enhancer for the inhibitors in the form of a metal complexing agent.

Non-carcinogenic corrosion inhibiting additive

An acidic aqueous solution containing a water soluble trivalent chromium compound is provided with a additive for improving corrosion resistance and reducing precipitation of trivalent chromium over time. A suitable additive is nitrilotris (methylene) triphosphonic acid (NTMP).

Corrosion resistant trivalent chromium phosphated chemical conversion coatings

A waterborne epoxy corrosion resistant primer comprises a waterborne epoxy, a curing agent, and a non-chromate containing corrosion-inhibiting pigment.

Chromate free waterborne epoxy corrosion resistant primer

The present invention relates to a zinc-diffused nickel alloy coating for corrosion and heat protection and to a method for forming such a coating. The coating method broadly comprises the steps of forming a plain nickel or nickel alloy coating layer on a substrate, applying a layer of zinc over the nickel or nickel alloy coating layer, and thermally diffusing the zinc into the nickel alloy coating layer. The coating method may further comprise immersing the coated substrate in a phosphated trivalent chromium conversion solution either before or after the diffusing step. The substrate may be a component used in a gas turbine engine, which component is formed from a steel material.

Zinc-diffused alloy coating for corrosion/heat protection

An acidic aqueous solution containing a water soluble trivalent chromium compound is provided with a solution stability additive for reducing precipitation of trivalent chromium over time. The concentration of the solution stability additive varies based on the complexing capability of the additive. Suitable additives for use as solution stability additives in accordance with the present invention are selected from the group consisting of acetic acid, glycolic acid, and mixtures thereof.

Stability additive for trivalent chrome conversion coating bath solutions

Growing community of inventors

Bristol, CT, United States of America

Promila Bhatia