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

Patent metadata

Field	Value
Publication number	US-2020232113-A1
Application number	US-202016791639-A
Country	US
Kind code	A1
Filing date	Feb 14, 2020
Priority date	Jul 7, 2014
Publication date	Jul 23, 2020
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

1 - 19 . (canceled)

20 . 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.

21 . The article of claim 20 , wherein the electric current applied to the substrate is a forward pulse electric current or a reverse pulse electric current.

22 . The article of claim 20 , wherein the method further comprises applying a secondary electric current to the substrate in the solution composition to perform a second electrode deposition.

23 . The article of claim 20 , wherein the electric current is 0.06 to 1.0 mA/cm 2 .

24 . The article of claim 20 , wherein the solution composition has a pH of about 7.0 to about 11.0.

25 . The article of claim 20 , wherein the solution composition has a temperature of 25 to 50° C.

26 . The article of claim 20 , wherein the solution composition is aerated with air or oxygen gas during the electrode deposition.

27 . The article of claim 20 , wherein the substrate is a coated substrate.

28 . The article of claim 27 , wherein the substrate is coated Zn or coated Zn—Ni alloy.

29 . The article of claim 20 , wherein the substrate is aluminum or steel.

30 . The article of claim 20 , wherein the substrate is an aircraft part.

Assignees

• United Technologies Corp

Inventors

• Zhang Weilong
• Kryzman Michael A

Classifications

• C25D9/02 Primary

  with organic materials · CPC title

• C25D9/04

  with inorganic materials · CPC title

• C25D9/10

  on iron or steel · CPC title

• C25D9/06 Primary

  by anodic processes · CPC title

• C25D13/06

  with polymers {(not used, see C09D5/44)} · CPC title