Method for corrosion inhibiting additive

Patent metadata

Field	Value
Publication number	US-2018073152-A1
Application number	US-201715817654-A
Country	US
Kind code	A1
Filing date	Nov 20, 2017
Priority date	Jun 27, 2007
Publication date	Mar 15, 2018
Grant date	—

Abstract

A method of selecting a corrosion-inhibiting substance includes selecting a corrosion-inhibiting substance to include a non-tungstate anodic corrosion inhibitor with respect to an amount of zinc in an aluminum alloy substrate that is to be coated with the corrosion-inhibiting substance.

First claim

What is claimed is:

1 . A corrosion resistant article comprising:
an aluminum alloy substrate having greater than 5 wt % zinc and 2 wt % or less of copper, the aluminum alloy substrate having a zinc-rich surface; and a layer in contact with the zinc-rich surface of the aluminum substrate, the layer including a non-tungstate anodic corrosion inhibitor and a cathodic corrosion inhibitor, non-tungstate anodic corrosion inhibitor including at least one of a vanadate compound or a molybdate compound and the cathodic corrosion inhibitor including a Group IIIB Periodic Table element.

2 . The corrosion resistant article as recited in claim 1 , wherein the aluminum alloy substrate includes 5.1-6.1 wt % of the zinc.

3 . The corrosion resistant article as recited in claim 2 , wherein the aluminum alloy substrate includes about 1.2-2 wt % of the copper.

4 . The corrosion resistant article as recited in claim 3 , wherein the aluminum substrate comprises manganese, magnesium, silicon, iron, chromium, and titanium.

5 . The corrosion resistant article as recited in claim 4 , wherein the aluminum alloy substrate comprises 2.1-2.9 wt % of the magnesium.

6 . The corrosion resistant article as recited in claim 5 , wherein the aluminum alloy substrate comprises 0.18-0.35 wt % of the chromium.

7 . The corrosion resistant article as recited in claim 6 , wherein the non-tungstate anodic corrosion inhibitor is zinc molybdate.

8 . The corrosion resistant article as recited in claim 7 , wherein the cathodic corrosion inhibitor is cerium citrate.

9 . The corrosion resistant article as recited in claim 1 , wherein the non-tungstate anodic corrosion inhibitor is zinc molybdate.

10 . The corrosion resistant article as recited in claim 9 , wherein the cathodic corrosion inhibitor is cerium citrate.

11 . The corrosion resistant article as recited in claim 10 , wherein the aluminum substrate comprises manganese, magnesium, silicon, iron, chromium, and titanium.

12 . The corrosion resistant article as recited in claim 11 , wherein the aluminum alloy substrate comprises 0.18-0.35 wt % of the chromium.

13 . The corrosion resistant article as recited in claim 12 , wherein the aluminum alloy substrate comprises 2.1-2.9 wt % of the magnesium.

14 . The corrosion resistant article as recited in claim 13 , wherein the aluminum alloy substrate includes 5.1-6.1 wt % of the zinc and the aluminum alloy substrate includes about 1.2-2 wt % of the copper.

15 . A corrosion resistant article comprising:
a substrate formed of aluminum 7075, the substrate having a zinc-rich surface; and a layer in contact with the zinc-rich surface of the aluminum substrate, the layer including a non-tungstate anodic corrosion inhibitor and a cathodic corrosion inhibitor, non-tungstate anodic corrosion inhibitor including a vanadate compound or a molybdate compound and the cathodic corrosion inhibitor including cerium citrate.

Assignees

• United Technologies Corp

Inventors

• Arsenault Sarah
• Beals James T
• Jaworowski Mark R

Classifications

• C23F11/187

  Mixtures of inorganic inhibitors · CPC title

• C23C22/40

  containing molybdates, tungstates or vanadates · CPC title

• C23F11/12

  Oxygen-containing compounds · CPC title

• C23C22/73

  characterised by the process · CPC title

• Y10T428/31678

  Of metal · CPC title