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Title: 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:
; ; ; ;
Publication Date:
Research Org.:
NEI Corporation, Piscataway, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1234692
Patent Number(s):
9,228,263
Application Number:
13/656,963
Assignee:
NEI Corporation (Piscataway, NJ) CHO
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}
}

Patent:

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