Solution composition and method for single-bath post treatment of substrate

Patent metadata

Field	Value
Publication number	US-11624121-B2
Application number	US-202016791639-A
Country	US
Kind code	B2
Filing date	Feb 14, 2020
Priority date	Jul 7, 2014
Publication date	Apr 11, 2023
Grant date	Apr 11, 2023

Abstract

Disclosed is a solution composition which may be used for a single-bath electrochemical passivation and a method using the same. The solution composition includes a metal cation, a metal-oxide anion; and an organic ligand, and optionally includes a non-metallic oxide anion or a polymer. The solution composition may prevent undesired precipitation of metal oxides before performing passivation. In addition, the method of passivation using the solution composition in a single-bath use is also provided.

First claim

What is claimed is:

1. An article manufactured by a method of single-bath passivation post-treatment, comprising:
preparing a solution composition;
applying the solution composition to a substrate;
applying an electric current to the substrate to perform an electrode deposition;
wherein the solution composition comprises:
a metal cation selected from the group consisting of Ce 3+ , Y 3+ , La 3+ , Pr 3+ , Sm 3+ , and mixtures thereof;
a metal-oxide anion selected from the group consisting of VO 3 − , MoO 4 2− , WO 4 2− , and mixtures thereof;
an organic ligand selected from the group consisting of acetic acid, lactic acid, citric acid, oxalic acid, salicylic acid, tartaric acid, ethylenediaminetetraacetic acid (EDTA), and mixtures thereof;
a non-metallic oxide anion selected from the group consisting of PO 4 3− , SiO 3 − , B 2 O 4 2− , and mixtures thereof; and
a polymer selected from the group consisting of polyacrylic acid, polyol, polyethylene glycol, and mixtures thereof;

wherein the substrate comprises a first metallic-oxide film formed from the metal cation, and a second metallic-oxide film formed from the metal-oxide anion or a non-metallic-oxide film formed from the non-metallic oxide anion.

2. The article of claim 1 , wherein the electric current applied to the substrate is a forward pulse electric current or a reverse pulse electric current.

3. The article of claim 1 , wherein the method further comprises applying a secondary electric current to the substrate in the solution composition to perform a second electrode deposition.

4. The article of claim 1 , wherein the electric current is 0.06 to 1.0 mA/cm 2 .

5. The article of claim 1 , wherein the solution composition has a pH of about 7.0 to about 11.0.

6. The article of claim 1 , wherein the solution composition has a temperature of 25 to 50° C.

7. The article of claim 1 , wherein the solution composition is aerated with air or oxygen gas during the electrode deposition.

8. The article of claim 1 , wherein the substrate is a coated substrate.

9. The article of claim 8 , wherein the substrate is coated Zn or coated Zn-Ni alloy.

10. The article of claim 1 , wherein the substrate is aluminum or steel.

11. The article of claim 1 , wherein the substrate is an aircraft part.

12. The article of claim 1 , wherein the substrate comprises the first metallic-oxide film formed from the metal cation, and the second metallic-oxide film formed from the metal-oxide anion, and the non-metallic-oxide film formed from the non-metallic oxide anion.

Assignees

• United Technologies Corp
• Raytheon Tech Corp

Inventors

• Zhang Weilong
• Kryzman Michael A

Classifications

• C25D9/08

  by cathodic processes · CPC title

• C09D5/084

  Inorganic compounds · CPC title

• C25D9/02 Primary

  with organic materials · CPC title

• C25D9/12

  on light metals · CPC title

• C25D9/04

  with inorganic materials · CPC title