Accession Number:

ADA564667

Title:

Nondestructive Early Detection of Metal Corrosion in Pigmented Coatings with Fluorescent Smart Materials

Descriptive Note:

Rept. for 1 Oct 2010-30 Sep 2011

Corporate Author:

ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE

Personal Author(s):

• Orlicki, Joshua A.
• Williams, Andre A.
• Labukas, Joseph
• Escarsega, John A.
• Placzankis, Brian

Report Date:

2012-05-01

Pagination or Media Count:

24.0

Abstract:

Fluorescent dyes were studied in an effort to develop molecules suitable to signal the onset of metal corrosion under a paint or coating. Rhodamine B and fluorescein were chemically modified to determine the effect of steric hindrance and electron withdrawingdonating substituents on the selective binding of these dyes to various metals. Rhodamine B and fluorescein were converted into the corresponding hydrazide to provide a precursor material. The hydrazides were then reacted with various diphenyl and dialkyl ketones to determine the impact of bulky groups on dye-metal binding. Electronic effects were probed as the hydrazide precursors were reacted with various aldehydes that contained substituted phenyl rings. Fluorescence measurements were used to determine the impact of each substitution on dye-metal binding efficiency and selectivity.

Descriptors:

• *COATINGS
• *CORROSION
• *FLUORESCENT DYES
• ALDEHYDES
• EFFICIENCY
• ELECTRONICS
• ELECTRONS
• HYDRAZIDES
• MODIFICATION
• MOLECULES
• NONDESTRUCTIVE TESTING
• PAINTS
• PHENOLS

Subject Categories:

• Coatings, Colorants and Finishes
• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE