Doctoral Dissertations

Keywords and Phrases

Acrylic; Colloid; Corrosion; Flash rust; Inhibitor; Unimolecular

Abstract

Waterborne coatings on ferrous substrates usually show flash rusting which decreases the adhesion of the coating and the corrosion products can form a stain. Chelating compounds were investigated as potential flash rust inhibitors. Compounds being evaluated include amine alcohols, diamines and sulfur containing amines. A new corrosion inhibitor 2,5-bis(thioaceticacid)-1,3,4-thiadiazole (H2ADTZ) was synthesized and its performance characteristics were evaluated. It was noted that the observed structure of 1,3,4-thiadiazolidine-2,5-dithione (also known as 2,5-dimercapto-1,3,4-thiadiazole (DMTD or DMcT)) has been previously reported in three different tautomeric forms including -dithiol and -dithione. The relative stability of each form as well as the synthesis and characterization of the structures of mono- and dialkylated forms of 5-mercapto-1,3,4-thiadiazole-2(3H)-thione (MTT) were examined. The methods of X-ray crystallography, NMR spectroscopy and ab-initio electronic structure calculations were combined to understand the reactivity and structure of each compound. Polymers were synthesized with a 1:7 or 1:8 ratio of acrylic acid to acrylate monomers to produce an acid rich resin. The polymers were reduced and solvent stripped to produce Colloidal Unimolecular Polymers (CUPs). These particles are typically 3-9 nanometers in diameter depending upon the molecular weight. They were then formulated into a clear coating with either a melamine (bake) or an aziridine (ambient cure) and then cured. The melamine system was solvent free, a near zero VOC and the aziridine system was very low to near zero VOC. The coatings were evaluated for their MEK resistance, adhesion, hardness, gloss, flexibility, wet adhesion, abrasion and impact resistance properties.

Advisor(s)

Van-De-Mark, Michael R.

Committee Member(s)

Sotiriou-Leventis, Lia
Ma, Yinfa
Nath, Manashi
Bohannan, Eric W., 1969-

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2012

Pagination

xvi, 160 pages

Note about bibliography

Includes bibliographical references.

Rights

© 2012 Jigar Kishorkumar Mistr, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

CoatingsCorrosion and anti-corrosivesChelatesPolymer colloids

Thesis Number

T 10096

Electronic OCLC #

828858484

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Chemistry Commons

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