Chemical conversion coating for protecting magnesium alloys from corrosion
Abstract
A chromate-free, self-healing conversion coating solution for magnesium alloy substrates, composed of 10-20 wt. % Mg(NO.sub.3).sub.2.6H.sub.2O, 1-5 wt. % Al(NO.sub.3).sub.3.9H.sub.2O, and less than 1 wt. % of [V.sub.10O.sub.28].sup.6- or VO.sub.3.sup.- dissolved in water. The corrosion resistance offered by the resulting coating is in several hundreds of hours in salt-spray testing. This prolonged corrosion protection is attributed to the creation of a unique structure and morphology of the conversion coating that serves as a barrier coating with self-healing properties. Hydroxoaluminates form the backbone of the barrier protection offered while the magnesium hydroxide domains facilitate the "slow release" of vanadium compounds as self-healing moieties to defect sites, thus providing active corrosion protection.
- Inventors:
- Issue Date:
- Research Org.:
- NEI Corporation, Piscataway, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1234692
- Patent Number(s):
- 9228263
- Application Number:
- 13/656,963
- Assignee:
- NEI Corporation (Piscataway, NJ)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C23 - COATING METALLIC MATERIAL C23C - COATING METALLIC MATERIAL
- DOE Contract Number:
- FG02-08ER85204
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2012 Oct 22
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Bhargava, Gaurang, Allen, Fred M., Skandan, Ganesh, Hornish, Peter, and Jain, Mohit. Chemical conversion coating for protecting magnesium alloys from corrosion. United States: N. p., 2016.
Web.
Bhargava, Gaurang, Allen, Fred M., Skandan, Ganesh, Hornish, Peter, & Jain, Mohit. Chemical conversion coating for protecting magnesium alloys from corrosion. United States.
Bhargava, Gaurang, Allen, Fred M., Skandan, Ganesh, Hornish, Peter, and Jain, Mohit. Tue .
"Chemical conversion coating for protecting magnesium alloys from corrosion". United States. https://www.osti.gov/servlets/purl/1234692.
@article{osti_1234692,
title = {Chemical conversion coating for protecting magnesium alloys from corrosion},
author = {Bhargava, Gaurang and Allen, Fred M. and Skandan, Ganesh and Hornish, Peter and Jain, Mohit},
abstractNote = {A chromate-free, self-healing conversion coating solution for magnesium alloy substrates, composed of 10-20 wt. % Mg(NO.sub.3).sub.2.6H.sub.2O, 1-5 wt. % Al(NO.sub.3).sub.3.9H.sub.2O, and less than 1 wt. % of [V.sub.10O.sub.28].sup.6- or VO.sub.3.sup.- dissolved in water. The corrosion resistance offered by the resulting coating is in several hundreds of hours in salt-spray testing. This prolonged corrosion protection is attributed to the creation of a unique structure and morphology of the conversion coating that serves as a barrier coating with self-healing properties. Hydroxoaluminates form the backbone of the barrier protection offered while the magnesium hydroxide domains facilitate the "slow release" of vanadium compounds as self-healing moieties to defect sites, thus providing active corrosion protection.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 05 00:00:00 EST 2016},
month = {Tue Jan 05 00:00:00 EST 2016}
}
Works referenced in this record:
Magnesium coating solution and method for preparing the same
patent, June 2011
- Nakatsugawa, Isao; Li, Wu; Ou, Bin-Lung
- US Patent Document 7,964,030
Corrosion resistant coating with self-healing characteristics
patent, November 2006
- Buchheit, Rudolph; Guan, Hong Wei; Laget, Valérie
- US Patent Document 7,135,075
Process and composition for sealing a conversion coated surface with a solution containing vanadium
patent, May 1989
- Cape, Thomas W.
- US Patent Document 4,828,615
Corrosion resistant, chromate-free conversion coating for magnesium alloys
patent, May 2005
- Briles, Owen M.; Jaworowski, Mark R.; Kryzman, Michael A.
- US Patent Document 6,887,320