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

Patent metadata

Field	Value
Publication number	US-2016002808-A1
Application number	US-201514755916-A
Country	US
Kind code	A1
Filing date	Jun 30, 2015
Priority date	Jul 7, 2014
Publication date	Jan 7, 2016
Grant date	—

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 . A solution composition for single-bath passivation, comprising:
a metal cation; a metal-oxide anion; and an organic ligand.

2 . The solution composition of claim 1 , wherein the metal cation is Ce 3+ , Y 3+ , La 3+ , Pr 3+ , Sm 3+ or mixtures thereof.

3 . The solution composition of claim 1 , wherein the metal-oxide anion is VO 3 − , MoJO 4 2− , WO 4 2− or mixtures thereof.

4 . The solution composition of claim 1 , wherein the organic ligand forms a complex with the metal cation.

5 . The solution composition of claim 1 , wherein the organic ligand is acetic acid, lactic acid, citric acid, oxalic acid, salicylic acid, tartaric acid, ethylenediaminetetraacetic acid (EDTA), or mixtures thereof.

6 . The solution composition of claim 1 , wherein the solution composition further comprises a non-metallic oxide anion.

7 . The solution composition of claim 6 , wherein the non-metallic oxide anion is PO 4 3− , SiO 3 − , B 2 O 4 2− or mixtures thereof.

8 . The solution composition of claim 1 further comprises a polymer.

9 . The solution composition of claim 8 , the polymer is polyacrylic acid, polyol, polyethylene glycol, or mixtures thereof.

10 . The solution composition of claim 1 , wherein pH of the solution composition is in a range of about pH 7.0 to about pH 11.0.

11 . 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; a metal-oxide anion; an organic ligand; a non-metallic oxide anion; and a polymer.

12 . The method of claim 11 , wherein the electric current applied to the substrate is a forward pulse electric current or a reverse pulse electric current.

13 . The method of claim 11 , further comprising, applying a secondary electric current to the substrate in the solution composition to perform a second electrode deposition.

14 . The method of claim 11 , wherein a cycle for when the electric current is applied to the substrate comprises about 100 ms of t c , about 20 ms of t a , and about 40 ms of t off as one cycle time.

15 . The method of claim 11 , wherein the metal cation is Ce 3+ , y 3+ , La 3+ , Pr 3+ , Sm 3+ , or mixtures thereof; the metal-oxide anion is VO 3 − , MoO 4 2− , WO 4 2− or mixtures thereof; the organic ligand is acetic acid, lactic acid, citric acid, oxalic acid, salicylic acid, tartaric acid, ethylenediaminetetraacetic acid (EDTA), and mixtures thereof; the non-metallic oxide anion is PO 4 3− , SiO 3 − , B 2 O 4 2− and mixtures thereof; and the polymer is polyacrylic acid, polyol, polyethylene glycol, or mixtures thereof.

16 . The method of claim 11 , wherein the electric current applied to substrate is in a range of about 0.06 to 1.0 mA/cm 2 .

17 . The method of claim 11 , wherein pH of the solution composition is in a range of about pH 7.0 to about pH 11.0.

18 . The method of claim 11 , wherein a temperature of the solution composition is in a range of about 25 to 50° C.

19 . The method of claim 11 , wherein the solution composition is aerated with air or oxygen gas (O 2 ) during the electrode deposition.

20 . An article manufactured by the method of claim 11 .

Assignees

• United Technologies Corp

Inventors

• Zhang Weilong
• Kryzman Michael A

Classifications

• C25D9/08

  by cathodic processes · CPC title

• C25D9/02 Primary

  with organic materials · CPC title

• C25D9/04

  with inorganic materials · CPC title

• C09D5/084

  Inorganic compounds · CPC title

• C25D9/12

  on light metals · CPC title