Date of Award
Spring 5-2018
Degree Type
Honors College Thesis
Department
Polymers and High Performance Materials
First Advisor
James Rawlins
Advisor Department
Polymers and High Performance Materials
Abstract
While it is well known that polymeric coatings are used to protect metals from corrosion, efficient and reliable protocols for quantifying and estimating protective coatings’ lifetimes have yet to match real-time results in rate or in detected mechanisms of material failure. Alkoxysilane pretreatments are widely utilized for substrate preparation and improved coating system performance by changing the metal substrate surface morphology to improve adhesion at the coating-substrate interface by creating a foundation and excluding water from the system. Three pretreatments used were 3-aminopropyltriethoxy silane (APS), tetraethylortho silicate (TEOS), N-[3-(trimethoxysilyl)propyl]ethylenediamine (DAS). They were investigated to improve the understanding of the relationships between the silane solution and the physical and chemical structure of the resulting pretreatment layer. They were also investigated to correlate the pretreatment structure with the charge transfer resistance at the interface to quantify and understand the contribution charge transfer resistance has on the silane pretreatment’s anti-corrosive performance. It was determined using Infrared Spectroscopy that the most uniform silane network was generated when the silane to water molar ratio was low. The pretreatment results were validated with pull-off adhesion results using Mechanical Testing System (MTS). Further, the charge transfer resistance and instantaneous rate of corrosion of silane pretreated substrates is heavily dependent on the thickness and structure of the silane, as shown using Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Frequency Modulation (EFM).
Copyright
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Recommended Citation
Vick, Russell, "Understanding the Coating-Substrate Interface Changes and Degradation Caused by Environmental Acclimation with Water and Electrolytes" (2018). Honors Theses. 563.
https://aquila.usm.edu/honors_theses/563