Media.Player

CORROSION INHIBITOR ADDITIVES FOR CATHODIC E-COATING Al ALLOYS

IP Title

ADDITIVE-ASSISTED, CERIUM-BASED, CORROSION-RESISTANT E-COATING

Detailed Technology Description

None

Supplementary Information

Patent Number: US7241371B2
Application Number: US2003344655A
Inventor: Stoffer, James O. | O'Keefe, Thomas J. | Morris, Eric L. | Lin, Xuan | Hayes, Scott A. | Yu, Pu
Priority Date: 17 Aug 2000
Priority Number: US7241371B2
Application Date: 6 Aug 2003
Publication Date: 10 Jul 2007
IPC Current: C25D001310 | C09D000508 | C09D000544 | C25D000904
US Class: 204489 | 204500 | 204510
Assignee Applicant: The Curators of the University of Missourilumbia
Title: Additive-assisted, cerium-based, corrosion-resistant e-coating
Usefulness: Additive-assisted, cerium-based, corrosion-resistant e-coating
Summary: Improving corrosion resistance of metallic components such as stainless steel components of vehicles, especially aluminum-based components of aircraft.
Novelty: Enhancing corrosion resistance of metallic components like stainless steel involves immersing anode and cathode containing metallic component in electrolyte and paint emulsion, then passing current to electrolyte

Industry

Chemical/Material

Sub Category

Chemical Composition

Application Date

Aug 6, 2003

Application No.

7,241,371

Others

*Abstract

Abstract of US Patent 7,241,371 - Additive-assisted, cerium-based, corrosion-resistant e-coating: Corrosion resistance of metallic components such as stainless steel components of vehicles, and especially aluminum-based components of aircraft, is enhanced by application of an e-coat paint or primer which is enhanced by incorporation of cerium ions into the e-coat electrolytic bath. The resulting overall coating includes a cerium-based layer under a cerium-enhanced e-coat paint or primer layer. Non-Confidential Abstract of Invention: An additive for cathodic e-coat system has been developed which is based on the incorporation of a cerium salt into the deposited paint. Elemental analysis shows cerium is not only present in the paint film but also concentrates at the bulk substrate. The presence of this corrosion inhibitor can improve the overall corrosion resistance of the coating. Examination of scribed areas after corrosion testing, as well as electrochemical data (EIS), shows the inhibitor is active in re-passivating exposed areas.POTENTIAL AREAS OF APPLICATIONS: Barrier type coatings for the aerospace and automotive industries; Coats irregularly shaped objects.MAIN ADVANTAGES OF INVENTION: May replace chromate or phosphate pre-treatments; Provides non-toxic corrosion inhibition of Al alloys and phosphated steel; Choice of soluble Ce salt allows for more dissociation and protection; Easy to incorporate into cathodic e-coat formulations.POSSIBLE DISADVANTAGES OF INVENTION: May discolor at extreme temperatures; If added improperly, it may destabilize the paint bath; Used for cathodic e-coats only.STATE OF DEVELOPMENT: Laboratory scale experiments are still being conducted.

*IP Issue Date

Jul 10, 2007

*IP Publication Date

Oct 25, 2022

*Principal Investigator

Name: James Stoffer, Curators' Professor

Department:

Name: Thomas O'Keefe, Curatorss' Professor Emeritus

Department:

Name: Eric Morris

Department:

Name: XUAN LIN

Department:

Name: Scott Hayes

Department:

Name: Pu Yu

Department:

Country/Region

USA